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 Forum index » DIY Hardware and Software
I can't believe IT STILL WORKS!!!
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richardc64



Joined: Jun 01, 2006
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PostPosted: Thu Oct 19, 2006 2:48 pm    Post subject: I can't believe IT STILL WORKS!!! Reply with quote  Mark this post and the followings unread

This is what started me off. I didn't forget it, I just didn't know where it was. Re-discovered in a box this morning while looking for something else. A very early sequencer published in Popular Electronics, more than 30 years ago. Used RTL ICs: a hex inverter and 2 dual jk flipflops as a 4-bit ripple counter. Sixteen steps seemed too short to me so I extended it to 64 steps by adding another dual flipflop. I also added a dual NOR gate (that's right, only 2 gates to a package) and wired their outputs thru pots to the 2-transistor "vco", like 4 of the inverters. The remaining 2 inverters formed the clock. Instead of hard-wiring flipflip outputs to the inverters and gate, I brought all the Qs and /Qs out to 4-40 screws and and selected different combinations of bits with alligator clipleads. I'll try to find the schematic.

Radio Schlock didn't have .1" hole perfboard at the time so I had to drill new holes in the more common -- at the time -- perf with holes on .156" centers.

So today I put in 2 'D' cells and, damn! It started beepin' and boopin'! I suggest you keep the volume low if you play the wav sample. (The stuff to drive parents and neighbors nuts.)


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Blue Hell
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PostPosted: Thu Oct 19, 2006 2:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

It sounds just like it looks, beautiful, and a bit dusty Very Happy
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Scott Stites
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PostPosted: Thu Oct 19, 2006 7:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
that's right, only 2 gates to a package


Shocked

Wow - for me, it seems like a miracle anything electronic works, much less thirty years later....
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Uncle Krunkus
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PostPosted: Thu Oct 19, 2006 8:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

I love it!
Now that's an antique, family heirloom. Cool

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zipzap



Joined: Nov 22, 2005
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PostPosted: Fri Oct 20, 2006 3:45 am    Post subject: Reply with quote  Mark this post and the followings unread

hey uncle, you´ve changed...
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seraph
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PostPosted: Fri Oct 20, 2006 5:31 am    Post subject: Reply with quote  Mark this post and the followings unread

zipzap wrote:
hey uncle, you´ve changed...

right, which side is the real you Question

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Uncle Krunkus
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PostPosted: Fri Oct 20, 2006 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yep,
a change is as good as a holiday!

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