This is the receiver for the previous transmitter. The microphone is of the high impedance ultrasonic type. The circuit activates a relay. The operational amplifier supports equivalent.
This sensitive multi-circuit and component prover uses two transistors and has a switch position where...
The LM117 (217 and 317) provides 1.2 A with output up to 25 V and is manufactured by several...
Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to...