This amplifier circuit with a low power MOSFET was found in Popular Electronics from the 90s. The circuit uses a small transformer of the type found in old transistor radios.
This circuit can be used as an optical switch or photosensor to excite TTL logic. The transistor can be...
This circuit was found in a Popular Electronics of the 90s. The output amplitude will be between...
This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a...