Getting a 43-year old decoder chip to do something logical
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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Should we blame the foam for that corrosion, or was there, perhaps, exposure to salty/humid air, and the foam sucking that up like a sponge?
Like a few other commenters, this takes me back. Ah the ubiquitous 7447 7 segment driver. I've used MANY of those in my time and still have loads ( plus many, many others from the 70's). Out of curiosity I just checked and I have some ZN230E chips date coded 7025!! Can't find my 7447s at the moment but they are probably 74-78ish and I know they work fine as I had them breadboarded with some 7 segment LEDs within the last 12 months or so … all working!
The problem with the chips in foam is not with the chips but the foam which just disintegrates after a few years. Rusty pins are because most older chips had tin plated steel legs(!!) Easily demonstrated by using a magnet on them. Just solder pot dip them, with plenty of flux and bet they work just fine.
If you are interested I think I have an actual virgin Z80 CPU somewhere too. I'm unlikely to use it so if you fancy it for tinkering, let me know and I'll see if I can find it to go with those other Zilog chips you have. 😁
And to think, I could have found a home for my collections "The Global Resistance Movement: Body, Tip, Spot Around The World" and "3, 5, 6 – Dot-Coded Capacitors To Thrill And Entertain You"…
It should not be hot. Please Check where the VCC and GND should be placed again.
Stop touching the polystyrene!
Just found this – makes me feel old, as I know all these chips very well!
Fascinating. I fellow could spend ages going through that bunch of chips and sticking them into breadboarded circuits. Hope you are thoroughly enjoying them.
Julian, can you please tell me the brand and model wire stripper you are using in this video. Excellent content… more like this (and the other logic series) please!
This was so interesting. I'd love to see more videos like this!
Have you got there some old Tesla ICs? I mean Tesla Company.
Great I love old stuff as well, i've just managed to score 2 boxes fulled with brand new 20+ years old parts. Could you please tell me what kind of wire is are you using (yellow one)?
One chip that you passed by – probably thinking it was a power transistor was the L200 Adjustable voltage and current regulator. Very handy for making a simple variable (or fixed) power supply with current limiting (and short circuit protection).