E & L Instruments Inc. Adam 5005 Main Frame

I bet it uses the Intersil 8038, the vintage is right and that device did come out a tad earlier than the similar in function but not identical Exar function generator ICs. Open it up and check, if it uses that IC then it will be easy to find a sample circuit that it likely is following. If the IC is bad, there were later variants of the IC that are either directly plug in or similar enough to plug in with some changes.

It wouldn't be in the Bug Books, those were just about the TTL.

Michael

Makes sense I've seen a similar modern design but the problem is that one D IP has a heat sunk glued to it and I can't read the part number. It looks l ike this is the part though. Chip has positive and negative power but no ou tput signals. I suspect its the chip. If the passive components had drifted there would be some type of signal and all I get it the same noise pattern s from all three output pins.

Find a datasheet for the 8038, and count pins. It the "unknown" IC has the same number of pins, then press on. See what pins the voltage goes to, if that's a match, press on further. With the schematic of a sample circuit in front of you, it's actually easier to then see if the circuit matches the sample than to trace out the wiring and then compare.

Michael

Thanks for the tips. I took the chip out and put it in a breadboard with one of the example circuits. Since there was no signal output with the chip in either circuit I suspect the chip. At this point I'm not going to bother finding a replacement IC.