Cassette Amplifier (CB21971E)

Using the CA3130, this NAB EQ preamp has excellent gain. The power supply does not have to be symmetrical.

Blown Fuse Alarm (CB6109E)
We found this circuit in a 1967 Electronic design. However, it can be easily implemented even...
Microphone Booster (CB15041E)
This microphone preamplifier with output intensity adjustment is suitable for modulating...
12 V x 5 A power supply (CB17141E)
This source was found in old documentation, based on a regulating integrated circuit popular at...