Found in an Electronic Design of 1964, this circuit is intended to the signal amplification in the 88 to 108 MHz band. The transistor can be a modern equivalent.
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...