Found in a Popular Electronics from the 90s, this circuit can act as a transmitter for an audio link. The output transistor admits a higher power equivalent, depending on the LED.
This circuit was found in an old 1980s valve documentation. The circuit can directly replace a...
This circuit is from an 80's component manual. However, the circuit may be of a modern equivalent...
Found in an Electronic Design from the 90s, this circuit makes use of a PLL CMOS. Values for...