Hi welcome to everyone's favorite segment: Mailbag where I Open my mail now I Tried an experiment last time because quite a lot of people asked for it. where I actually went through a whole bunch of packages in really short order and averaged about two minutes or didn't do more than two minutes per package and the feedback from that was near. No one really liked it. They wanted to see more.

They did like the speed-up process of opening the boxes and things like that. but apart from that, no, they wanted longer technical look at things that were more interesting. So yeah, we'll kind of have a combination of that. Maybe.

Anyway, let's go. um hi do Adam drizzle Jack huh? that's a I don't know how to pronounce that one from Guilty In in Germany Hi to all my German viewers. So let's have a look what Adam is set in shall we? and hate ones that have a lot of tape on them. They're actually really quite difficult to open.

We have a blank piece of grid paper. got some awesome postcards that we're setting Germany Newman MIT Newman wrote a little love I can't pronounce it anyway. There you go. Very, very nice.

Oh, and we've got the German Space Operations Center maybe is from the German Space Operations Center Oh, let's have a look. Any static bag must be good. sorry static. Ah look, no, it's simply sorry.

Thank you very much. But it's er, nothing technical. Can smell them already. Why can you smell them I have no idea what they are and nip on what on earth it.

They're like a chokolate coded way free biscuit. Um, thing is, why can you smell through that like they're supposed to be like you know, hermetically sealed packages. I'm setting you some nice quality, high quality Nippon Choa Kok On capacity does what he found an undisclosed German supermarket they made by a German company corn hoster which is said to be top-secret R&D division of Nippon Chemi-con Corp What? Each one stores about 280 kilojoules of energy and is rated for up to 1 MV mouthful volt. However, their ESR sweetener equivalent sweetness rating is relatively high, so they're only suitable as backup caps for low power demand applications are brilliant.

thank you very much! Adam Nippon Nippon Chemi-con My favorite capacitors. Next up, we got one from Cambridge Massachusetts hi to all my viewers in Cambridge this one's from Abdul Rahman thousand and Erik Johnson Hi guys, thank you very much Huh? From the United States of America we've got one of these easy pull tabs Oh What do we got? We got choose good old-fashioned tubes, electron tubes for those playing along at home, or tubes if you want to call them that. A lot of people call them tubes here in Australia Greetings from MIT this is Abdul and Erik I'm their electrical and computer engineering students and generally enjoy your channel. thank you very much.

It would take a many sleepless nights to take a break from homework and watch an episode or two. Excellent! We've collected a variety of old vacuum tubes seem to be in great shape. They'll found the old store there Apollo has been forgotten for decades. No idea how valuable they are today.

Some are really valuable. There are some valves mainly for the audio fool market that go for like hundreds or even like like 800 or $1000 I think there's some really seriously expensive valves if you can still get them I Don't think anyone actually collects them as such I don't think they're worth anything as far as collecting goes, but as far as like, you know, tubes for a ram for you know, audio stuff, then yeah, I think you can get decent money for these things anyway. I'm not really a tube guy, so take these and if anyone knows if these are any good or not, let us know in the comments. Well, this is almost a who's who of our tube manufacturers.

We've got National GE Sylvania and well, there's some RCA or ICA ripoffs Raytheon so yell at the Youtubes if you've heard of any of these. The 5751 from National made in the United States of America No worries and we've got a GE 6aq 5a or a 6h G 5 electronic tube thank you very much or Tube and then General Electric. Five stars thinkin' others for star rubbish made in the United States of America Yet again fantastic. The 5749 what are we got the 6350 from Sylvania from Sylvania look at that gold brand electronic tube.

thank you very much. Always love the nipple and this RCA job' Here it's a 6a K-6 made in USA from RCA Jrc I thought or maybe US Japan radio Corp but no it's actually made by RCA and date package 10th month 54 Wow Fantastic! This electron tube is physically and electrically similar to the CV 1750 1762 valves. So what? RCA makin' like not rip off ours but like compatible valves were they I don't know anyone got the history Raytheon they're all made in the United States of America um radio tubes. There we go.

It's a 6b C7 I'm sure there's some 6b C7 fanboys out there and this monster here which is rather I'm ugly looking tube. Check that out, I don't--i ain't care for that one at all. What's that? a 4, 4 - oh nine, one, eight, eight five? Yeah yeah loser. I Like the cute little ones look at that so thank you very much.

Abdul and Eric from Cambridge Massachusetts and there's MIT Yes we do have a university in Australia that's named almost similar RMIT that's a Royal Melbourne Institute of Technology in well you guessed it's in the name. No these guys got ourselves a DHL Express from Hong Kong from Siz SZ Galena Co Limited. Maybe I've like ordered something and I've forgotten about it. um cuz it's actually no it 100k right? No.

I think I know what it is yet? We've had this company on the blog before so they're having a second suck of the SAP and yep I think I emailed me that I was getting this and it'll be for you. were fishy and Otto's out there. Oh it's a little rabbit from Lumen Top Da. We have a flashlight for all your flashlight aficionados or a torch so we call them Iran Australia Is that upside down? Well, the electrons are gonna fall out and it looks like we have three of them.

Let's take a squiz. And we've seen Lumen Top torches before and they're decent quality. They're sent in this TT 16 They didn't include any aspects in the box, but we've got a lanyard and something else I don't know. Oh yeah, rubber, spare rubber, o-rings and stuff like that.

So this is a tactical flashlight as they call it and it's got basically all four different modes mytable, five or six or something like that. but basically up to a thousand lumens maximum with a cree xml2 LED none of the fake rubbish they'd be genuine. Cree LEDs in these things retails for a hundred or 99 US bucks so it's a serious flashlight. Feels great quality.

the anodizing on it absolutely brilliant. Built like a brick Danny They claim up to 310 meters are throw on this thing I Don't know I can't test that here in the lab and up to a thousand Lumens maximum are 2.2 hours and bit of cause that's like that's insane Oh mode. It's also got 35 lumens for 40 hours which is a decent runtime for 35 lumens or 220 lumens which is much more practical for everyday use. 8.7 hours Oh Ring seal Of course you wouldn't have to worry about dropping that in the water and a rechargeable um 18 650 cell as well.

This one's got the ability and protection circuit. that'd be the in the end there yeah to be in the topside there. maybe there it is under there I Can see where they've yet got the battery and the protection circuits in there. Highly recommend the protection circuit in the battery so let's switch they're on by default.

It goes to the last mode you left it up which is very nice. that was 35. This is 220 lumens and that's the 4000 lumens. here.

you can't get a decent view of that on the camera, but you'll notice that if I switch it off and then back on, it'll go back to the thousand. so that is super intelligent. I Like that. You might think that's a metal ring around there that's actually rubber on there so it's designed to see how it bounces.

It's designed to sort of take an impact like that, so that's pretty. Jersey I Like that. Nice design. If we switch this baby on, that's the 35 lumens 220 and a thousand.

Nice wide beam. It look might look a bit worse on camera, but that lights up pretty well. I've got constant exposure on the camera there, but that works really nicely. and just a trigger warning.

No, not one of these newfangled emotional trigger warnings. this is, you know, neurological or medical or whatever. If you don't like strobe lights, then yeah, pause and fast-forward now because it's got a strobe mode. Here we go boom and it's also got a slower our strobe mode as well.

Then we've got this cute little puppy. the lumen top a worm. Um, it's only 13 bucks. Super cheap.

It's got the crea XP G2 for those playing along at home. 110 lumens maximum and this looks like a nice better kit. I'm very very happy with my this is my everyday carry which I have on my ring everywhere I go and I use it all the time. that's a multimode I can't remember the exact model of that, but that's a lumen top as well and that has been awesome.

And this thing. It's kind of cute, actually smaller need although the problem with this one is that it doesn't have the switch in the end. I Much prefer the two-way action of this one. Okay, so I can twist it off and also use a switch so there's no way this can accidentally go off in my pocket.

so I much prefer that even though it is a little bit longer than this worm. But for 13 bucks me can't go wrong and there's sent me a special warm brass one just like my other one. I think what is a special I'm not sure if you can buy this I think it's for yeah Oh look at that. look at that fancy pantsy thank you very much.

Exactly the same but made out of brass for sweet ass. Another one from the United States of America this time from Ann Arbor in Michigan from Dan Roman Chick Gray Dan and he's probably tell from the form factor what it might be. Anyway, we'll find out later than I this one's getting near. this is going to be nasty with the big knife, so do this.

Let's have a look. Dan is a He's a ham. Not only is Dan a ham, but he's written some study guides for a ham radio operators to get your licence. Brilliant! Let's have a quick squeeze check these out.

These look jazzy, no nonsense? no BS Thank you very much. A different study guides for I Didn't know there were two different classes of ham radio. the general class and the technician class. I Take it, the technician classes are better, but why is it thinner Oh any I don't know no I think technician I might have that back-to-front I think the general allows you to do more I'm going to stand corrected on that.

Have to google it when I do the Edit for this thing. Anyway, Dan has written these two guides which are free as a PDF on his website which is absolutely awesome. Or you can buy the print edition or the eBook version and I'll link them in down below. So if you are going for your ham radio or you want to go for your ham radio exam, then let's these are go up to 2019.

Fantastic! I Guess they change the rules every few. They you re-evaluate the rules in 29m. Do they: Electrical principle, circuit components, practical signals and emissions, antennas, feed lines, radio wave propagation. It's all in their safety.

and apparently it's a thirty five question multiple choice exam are both the technician and the genuine. You must score at least seventy five percent. So you've got to answer twenty-six out of thirty five incorrectly. And I'm sure if you follow Dan's guides, you'll no doubt.

I Get these things. There re electrical principles. There's your reactance and everything else. Fantastic transformers.

You've got Ohm's law, all sorts of stuff. our general electronic stuff as almost everyone would know about that sort of stuff. power supplies, schematic symbols are there you go. and then you've got to do some FET stuff.

There you go. So if you want to brush up on your FET I even do some digital stuff, Well, there you go. amplifiers and oscillators and all sorts of stuff. There you go basic antenna theory and things like that, isotropic antennas and all dipoles and that sort of stuff.

So cool. And one for the technician class as well. Anyway, my won't go through them. Check out his website.

You can download the PDF yourself and by all means are buy it to support Dan. Fantastic good on your dad and I do get this question quite constantly. I am or do I have my Ham radio license? The answer is no Am I going to get one. The answer is probably no because I don't lie, Necessarily like the idea of getting it just for like to say I've got it, you know, just like a trophy thing, you know and I just don't have the time or inclination to use it probably.

but I don't know if anyone can convince me otherwise. Oh yeah, maybe I should do it. Get my license baby here. Can you choose your own callsign? VK to evey perhaps? Hmm.

one from Germany. Well, US and Germany are my two most popular countries where I'm viewed anyway about roughly 25 percent tops or something from the US. Germany's about well, 14% something like that. and then the UK and Australia I think or as Canada right up there.

Canada UK Australia about very similar anyway. um, thank you very much. Fredrik Muslim from Bonn in Germany haven't been upon let's have a squeeze oh I think I use Chopin I stopped the note. Sorry, All right let's have a look.

Whoa. We have ourselves a shield. Let's check it out and Fredrik Here launched his first Kickstarter which was successful because I was talked about on the Eevblog forum and everything else and he used my video on that I did about Dad, How does it? You know price, your hardware products and things like that and he did that and for it and it's been quite successful. Anyway, this is a DES Pick Mike microchip Das Pick Arduino shield and it's a tiny music synthesizer.

There you go so you know you don't need much more than the Das Pick. You just need output driver and that's about it because DSP A Pick is a 16-bit processor 32 Km 256 K a flash All the other jazz no floating point support don't necessarily need and but perfect for generating our you know stereo FM signals and things like that. Anyway, he's managed to pack in an FM synthesizer engine with ten voices for operator algorithms, sample and play black with eight voices, 32 drum and percussion samples. Fantastic! and it outputs in 16-bit stereo.

Absolutely terrific. So if you are in the market for a music synthesizer to output any form of music from an Arduino check it out. I'll link it in down below looks jazzy and a third suck of the south from Germany Did we live it? Ah, Tobias Muller Oh your um Toby's been on here before. Is he having a second suck of the sevens? Well, Oh got some nice flowers.

the flower stamps there too. Anyway, our tubing Tubingen Hmm, you know I can't pronounce anything Anyway, let's whip it open. So Tobias is sent letter Wow Lots of stickers Warning: this device may contain Internet Okay, Oh, hang on. Wow Should I be concerned? Should I be concerned? NSA I sure I I am on some sort of us watchlist anyway.

Huh? Well, we've got lots of goodness in here. Handle with care. this way down or this way up. Oh okay, looks dangerous.

Let's go. All right. we've got some interesting stuff in here. I Think this is going to be really fascinating? You'll like these.

and yeah. NSA Monitored device Oh Where's the tracker? So one of these, one of these bloody MS NSA You got to watch with you anyway. Oh, that looks like a that's like plugs in your multimeter, not no plugs in your power supply. Okay I thought I plugged it and plugged in your multimeter doesn't plugs in your power supply.

Hey, isn't that Jersey There you go. It's a USB charging adapter for bench power supplies for easy monitoring and limiting of the USB current. so you just plug that in Anyway, it's all github all down here. I'll link it in if you want and you can of course use the current meter on your power supply to measure the charging current and the switches here.

of course, switching a resistor out Bob They'd generate like a voltage on the lines and things and that's how Apple and others are determined what charging mode to actually use. So that's neat. I Like it Anyway, get up down below and check out what we have here. Yeah, look at this.

It's one of these flippy dot displays. These really aren't they? Super bright sort of that might look green on the camera. It's kind of more yellow. I Do have my white balance set.

Maybe it's just the LCD have them calibrated it. Anyway, Flippy Dots: Um. Flippy dot display. Let me show you the bottom of it Anyway, you've probably seen these.

They flip from black to whatever colors on the front. Usually it's green or yellow, but you can get others and you'll see these in. you know, like terminal displays in airports and things like that. There are dot matrix.

although these will come in lines I Believe will they? Yep. so there's the individual flippy module obviously D soldered there, but so second hand. but of course there's not much I can go wrong with them. They just got a coil on there and it just you can just flip them over like that and they of course super high visibility.

It can't get much better and they're just, you know, great. And they don't require any power to stay in position. you just you know, only require power when you flip them over. Oh isn't that cute? look at that.

Apply on 12 volts Ac to it I will square wave at 102 Hertz and there you go. Flip, flip, flip, flip and you'll notice that the ones next to it are actually affected. Looks like we have some coupling between that first one and the next one. Now of course.

the interesting thing about these is that you only need to pulse and I'll show you the datasheet in a sec. You'll notice that if I try and flip that over, it will actually flip back. Ok, that's because it's magnetized one coil there and it will always flip back to what it was actually programmed to do. Now if I apply.

Oh I think I got around the work right way. I've set my function Jim to give a one my one millisecond pulse because that's the spec on this thing and we'll see it flipped over. Okay, it's given a single one millisecond pulse every 500 milliseconds. Okay, so it only goes in the one direction because it's not going negative.

Now we've flipped it over like that, you notice I haven't changed it, but now it flips back to the negative. What should? Yeah, it flips back to the negative part and if we I think we head around the other way before, didn't we? So if we sorry I should have been set up triggering there we go and it flips back and there's nothing really advanced in there at all. This you know they're electromechanical beasts and there's a couple of coils in there and that's all she wrote. And these things are really, really versatile as you can see really high contrast and you go between the black and the yellow, green or whatever color you choose and then got incredible contrast on them.

So they're great for those terminal displays and you'll see them flip because they're often. they're multiplex of course, you know, like that while the drive system will be multiplex so you'll see them like flicking rows or something like that. as the multiplex that goes along and updates the display, you've no doubt seen those in airport or bus terminals or something like that. This is an Alpha Zetas brand.

For those playing along at home, they go. Oh yeah, I know Alpha Zetas I Use them all the time, No worries. Um, and here's a They use flip disk technology no trademark on that. These ones are available in two different sizes: light, reflective out materials involving red and fluorescent culinary materials including yellows I Think that's what we've got here and but you can get the reverse side B in any other color as well up to a hundred million operations these puppies are rated for.

So very, very impressive. There you go. It specifically tells you down there for variable message signs. the magnetic memory retains the indicator status through shock, vibration, or power fire, so that's a beautiful thing about them.

You know you're in your airport terminal or whatever and the power fails well. The sign still going to the last sign that they said is still going to be up there and it looks like we can go up to 24 volts for 500 microseconds here for the pulse width. So presumably this would be like the minimum pulse rate required to magnetically set the the magnetic memory on the thing and flip the dot. The interesting thing though, is that while the maximum pulse rate at 20 degrees C they specified it in temperature, so at ambient temperature nominal 368 pulses per second, very impressive.

and the maximum pulse rate at a higher seventy degrees C is 102 pulses per second. Amazing! I Don't know why you'd want to pulse them that fast I Like Alysha doing animation on the things or something anyway. Dot: Mechanical turning time takes 70 milliseconds. maximum average of 50 milliseconds to flip your little dot over.

There you go. So these things are neat I Love them. Flippy dot displays as I call them like flipped I Call flippy dots displays because it sounds cuter. Anyway, these things are fantastic.

So would it be nice to like wire up something in be able to you know, like well, we've got What? An 8 by 2, 4, 4, two, four, six, seven. That's enough for a character anyway. So yeah, anyway, you can't do a huge amount unless you had like a big huge one something like that. And so these are obviously surplus.

But nothing wrong with them so you can reuse these no worries whatsoever. And as you can see, they do like. it is hard to sort of flip those so they are right about the vibration. and you know stuff like that hope mat like actually retaining the magnetic memory in the theme, you know? I've got a manually sort of get in there and actually flip the dot over.

So yeah, they actually retain their last image. Ah, pretty well. Yeah, look at that beauty. So thank you very much Tobias for an interesting look at the flip e dot displays.

That's awesome! I gotta have one from the old dart just to even out the countries. Ah, this one is from Mr. T Coop excellent from Sunderland in the old days so let's please open it carefully. Yep, there we go and carefully opened it at the top.

Oh wow. Old school. sorry for spoiler. Yep, old school smell.

We have an old school but Yamaha what on earth is that from I don't know some Yamaha bit of audio kit now. Teza sent in this board which he wants me to fix. so I'm not sure what video blog is watching but yeah, I don't really do repairs here on e ball, not repairs that people send in anyway. Um, it's that people always think it's a quick fix.

Um, let's have a look at the board here now. it's fresh. It's a Yamaha from a Yamaha thin keyboard. PSR two-seven-five keyboard.

and well, there's a few issues with this. Right off the bat. it did send in the overlay for it, but no schematic so we've got the component overlay. You can see that there's a DC jack missing here.

presumably this light goes right out the back of the unit and this is where the user plugs in their. you know, decent. They're placing their plug pack to power the thing and the board is like it's cut right off and it looks like it's burnt as well. Something has gone horribly wrong there.

And not only that, but look at this. There's a what looks like a weird 4 pin connector there. Ah well. at two pins plus button I was at two mounting pins I Don't know, but that's how the crap burnt out of it.

Pads absolutely lift it off there. look at that that has been absolutely butchered and that is marked as the left speaker and then the right speaker as well has been totally butchered. All the pads left off. so jeez, you know, like yeah, you could.

If you're desperate I repair this. You know you put the connector back in and epoxy. It may be budging a board or something like that, but gee, and I well if I was desperate enough to get something like this back up and running I'd do it. but no, um, sorry tears I'm not going to attempt to repair such a thing and send it back.

It's not what I do here on the eevblog. Anyway, there you go. Single sided board, classic construction, heat sinks obviously missing but still got the heat sink compound on the back there and what on earth is you know happened to and the ribbon cables Ben D soldered as well from the other end and it's all a bit. how you doing? Um, like yeah, hmm and tears Also asked if I can power it up and test it to see if it's worthy of being repaired.

Well, no, not really. I've got no information at all about this. Um, so no I can't just pair it up and test it I'm afraid. so sorry just for a future reference of those who want to send something in to be repaired.

it's not what I do here are on the mailbag and any repairs I do are things I'm personally interested in for some reason. so yeah, please don't send things in for repair Thanks we don't get too many from Greece I don't migrate viewers are this is so torus Zorba's pronouncing that guaranteed incorrectly. Anyway, thank you very much. Let's see what's in yet.

Probably have one of those quick opening things. doesn't matter. Let's see. we have a note and we have a doodad.

but what? Reading the notes a bit of a spoiler for myself. It's a it looks like a display module Sigma Zetas electronics one of those. um is that it is that a two digit sorry. a two line display module.

So toss is apparently how you pronounce it and 23 years old has been going since it was 12. Absolutely. Beauty. and um, this is his first open-source hardware project.

It's a programmable paddle made out of sorts. Awesome. Let's check it out. So so Tiss is sent in this little panel meter.

He can't actually see anything in there at the moment, but this is, uh, presumably an open source hardware is. it doesn't save it Day is available from his tindy store down here and it's pretty spec. it's are adjusted. Each one is individually calibrated for around about a point.

Oh, five percent a gain error. Not too shabby at all. It's building twelve bit ADC and everything else. and there's current shunt resistor in there with a hundred millivolts.

so maximum input voltage range of five volts. Typically these are doesn't say the maximum number of counts really, but these things are typically you know, 200 millivolts our full-scale import or something like that. So this is 5 volts a full-scale input which is kind of handy so you get you know, so you're not down in the noise. You know, if you've got a 10 volt power supply or something, you would just drop that in half to give you your maximum five volt input.

Rain. So let's crack it open. So there you go. That's actually a two-digit display couldn't see behind there, so voltage and current at the same time presumably very jazzy and that's all she wrote.

In the back there's a micro external ADC CMC three triple 1/2 for those playing along at home and and a high side current since in the max are forty four two eight four and current shunt resistor and I don't think there's only one current shunt resistor and Bob's your uncle, so that's neat And did you show to us? let us know. Did you get this case custom-made and you just fitted the board to fit? Is it like another? Is it a different case or anything like that? or did you get a custom-made Let us know. Now the interesting thing is that there's a I squared C interface as well, so you can transfer our data and get measurements and things like that, so it's kind of like a year. I all in one solution for your panel mount microcontroller projects and stuff like that.

Pretty good for a do-it-yourself power supply. Should work a treat. Next up: one from Sweden by the looks of it and security alert Security alert. look at that.

Um, security checked. Jeez are serious about this I didn't want this to get out of the country. Um from Sen speak I think it's from John Hellman Not so far. John's the person who just is the packing shipping person or whatever or be you all that sent it in.

We won't know until we open it up, so let's do that. Yeah, DHL Jeez, they work serious now. checking. this obviously looked completely suss.

Ah, what on earth are these things? Hey Dave your blog is wonderful. We just love it. Awesome! Thank you! Oh, it's available on IndieGoGo It's very mirror-like finish. It's a PCB it's called the PCB Aight or Pc Bite yes, apparently.

Uh oh sorry. Johanna Johanna Hellman Magnus Shh So Berg and Magnus birch thank you very much guys and they're from Sweden and this looks really interesting. It's a PCB hold up but it's springy I'd like I I Was baffled at first at how it worked, but sticks on there and you've got four of these holders and you mount your piece it and you can put them anywhere on there. They've got neodymium magnets on them and you slide that down and hold your board in place.

Neat. and here it is. It's called the PCB right? Umm, the mirror finish really disturbs me. I Like that is not the best thing anyway.

it's a metal surface and it's just got some feet on the back. anyway. What is that? Some sort of not a nice stainless steel or something? I'm not entirely sure, but these little magnetic with things with neodymium magnets and this and these just go down like that and click and sort of like clamp your board. And of course you can move them around anywhere.

and Bob's your uncle. It's beautiful. Check it out. I Can just use two to hold my board there like that.

Fantastic. and it's just sort of an you can move it around like that of course. and they're very handy, even with just two supports in the middle of the board. My board just happens to have a a slot cut out in there that fit this very nicely, but you don't need those of course.

But if you do have something like that, I mean I'm putting a lot of force onto that. well. I could easily put my iron down there and put a lot of force and that puppy is going nowhere. But of course that's just because it's not going to.

it's because it's in the slot like that. If I actually put it out like this, that's it. Oh no, it's a similar story Bob Mwah. But actually, even with two clamped at the back like that, I can still go like that.

maybe push stuff in so you know of course you add a add a third one here and this puppy's going nowhere, so that's really quite easy. That's probably easier to use board holder I've ever had. that's just great and there's a bit of giving it to which I don't actually mind. So anyway, this is an IndieGoGo it has finished but it raised our three hundred and seventy percent over or something.

so they made it and it's 49 bucks. Bit pricey but these are these do look really SuperDuper high quality and a diamond cut grip. Look at that otherwise known as kneeling and spring-loaded strong neodymium magnet at a lifetime. Wordy, beautiful, but these are really quite well engineer.

They're super high quality and I love that spring ain't gonna wear out anytime soon. I Don't think so. that's a winner. If you want those, check them out, link down below.

Hi! this one comes from somebody in the forum who asked about my micro calc project and I've touched on this before in one of the live shows I think I explained a little bit about it but I thought that probably deserves its own little short blog describing the what the micro calc is, the project, and some of the design aspects that went into it cuz it's rather interesting. So let's go. What it is is, it's basically the world's first and only credit card-sized programmable scientific calculator.