Electronics > Projects, Designs, and Technical Stuff
Military Microphone Amplifier - Amazing Old Tech
magic:
--- Quote from: Bud on June 19, 2020, 03:40:40 pm ---Could be capacitors. Aren't they marked with something?
--- End quote ---
Sure, 104J :D
The large ones are between the rails of the opamps, the small ones are probably compensation.
james_s:
104 is a 0.1uF, the J is either a temperature range or a voltage rating.
magic:
J is 20% tolerance and I made it up because it's a supply bypass cap :-DD
Damn, it seems J actually means 5%. I could swear most generic film caps I see are J though. Apparently they are better than I thought :-//
duak:
In the 70s and before, for custom and small production runs, I found it was quite common to have ICs in sockets, especially for RAMs and multipin packages that were hard to unsolder. It was a trade off between bad chips vs bad sockets. I remember chasing down an octal register that would get blinky when warm. The board cost me over $1000 and I didn't want to damage it. I had a replacement chip so I just cut the pins off and pulled them out one by one. It wasn't until the Japanese showed how to make and deliver known good parts (practically zero defects) in the early 80s that sockets became passe.
willeye:
As i got two i thought i would open the second and see if there are any changes and it looks llike this is a newer version. The original is serial B108 and this one is B101. As this is the first thing i have reversed it is more difficult than i thought :)
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