Help me identify these PCBs!

[mars77]

Hello everyone, I have some vintage computing parts but I have no idea what they are from or if they are worth saving from scrapping. I am hoping if I post some photos then I can identify them....

First up I have a stack of these...

They say various things on them such as....

A2/2004/658
ISS B
QUADRATURE FORM
FRAZER-NASH

They have blue 49-way edge connectors at the bottom. They all appear to be different.

Anyone any ideas what they are from or could be from?

 

[g4ugm]

I am pretty sure the board in the picture is not a digital computer board as such. "quadrature" usually refers to analogue signals 90 degrees out of phase. Can you post a picture of the IC that's clear enough to read the legend please? Also A2/2004/658 hints at perhaps a 2004 date so not that old...

 

[xprt]

Maybe SSB QUADRATURE as in single sideband quadrature. Maybe part of a radio or other communication system. Doesn't look like it was made in 2004. More like 1984.

 

[KC9UDX]

Maybe SSB QUADRATURE as in single sideband quadrature. Maybe part of a radio or other communication system. Doesn't look like it was made in 2004. More like 1984.

My thoughts exactly. The dates on the chips should help.

 

[Chuck(G)]

Could be, but "quadrature" can relate to positioning or AC phase detection applications as well. The numbers on the ICs might help, but I suspect that they're either op-amps or comparators, given the power supply rails (one is + one is -) along the edge.

 

[xprt]

All this quadrature stuff reminded me of polyphase networks, and I remembered they are 4 section RC networks. I wonder if the sets of 4 resistors are polyphase networks.

 

[mars77]

The ICs on the board are...

936 AC TL081CP

I've pulled another one out of the pile.....

This one says TIME-BASE GENERATOR BOARD PCC8014

 

[KC9UDX]

Does that capacitor have a broken lead, or is it an illusion?

Anyway, it sounds like an oscilloscope, spectrum analyser, or service monitor or something.

 

[Chuck(G)]

Yup, an op-amp. Without tracing the circuit, the application is hard to determine.

 

[g4ugm]

still be nice to see the ICs in focus. The date codes on those look like 72xx or 77xx which would be 1972 or 1977. That's a big gap...

 

[FishFinger]

Looks like 7430 and 7237 on the two 8-pin ICs.

 

[mars77]

Sorry, my phone camera doesn't really do focused image

The date codes on the ICs are 72 and 74

My question I guess is are these any use to anyone or am I best of just scrapping them? I have about 35 of them in total.