Products > Test Equipment

Test Equipment Anonymous (TEA) group therapy thread

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bd139:
Thanks for posting that - much appreciated.

nice design. Looks like it's using the CD4069UBEs (unbuffered) as amplifiers and the 4066s as switches to select range/gain. Chopper perhaps to kill the offset.

I'm genuinely amazed at what you can get your typical CMOS ICs to do that they weren't designed for :D

Edit: interestingly I built the mic amp years ago with a CD4069BE. It had a ridiculous gain of about 50dB with just one gate and a feedback resistor. Surprisingly you can get 30dB up to about 10MHz out of the thing.

Specmaster:
Thing that strikes me apart from it really looking like its new and nicely laid out, is the sheer amount of wasted space in it. Could have made it so much smaller with ease.

BravoV:

--- Quote from: Specmaster on May 10, 2018, 09:59:11 am ---Thing that strikes me apart from it really looking like its new and nicely laid out, is the sheer amount of wasted space in it. Could have made it so much smaller with ease.

--- End quote ---

Agree, lots of free space inside, also from date codes, it was manufactured in early 90s.

Its still very new as its stored practically in the box all this time, you can see from the bottom metal rainbow colored plate, that kind of metal usually will start to show sign of rusting once the equipment is exposed to humidity, its still smooth & shiny.

Brumby:

--- Quote from: bd139 on May 10, 2018, 06:39:20 am ---I got though more 465’s than shoes in the last 5 years  :-DD

--- End quote ---

--- Quote from: bd139 on May 10, 2018, 06:45:15 am ---I reckon a couple of hundred so far.
--- End quote ---
That isn't helping.



--- Quote ---And they’re not bloody cheap!

--- End quote ---
Thank you ... that's taken the edge off a little.

tggzzz:

--- Quote from: bd139 on May 10, 2018, 06:45:15 am ---I reckon a couple of hundred so far. And they’re not bloody cheap!

--- End quote ---

Last time I looked, CPC had them at a tolerable price - much cheaper than Farnell. Not a wide range, but you don't need that for 4x5 scopes :)

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