This FM micro transmitter was found in an 80s spy book. The circuit can work with equivalent FETs and is powered by a voltage of 0.6 to 6 V. Details of the coil are given next to the diagram.
This amplifier for automotive use is from the Philips Databook of 1990. The integrated circuit must...
This fast-acting circuit uses any phototransistor as a sensor. The circuit drives a 30 V relay, but...
With this 1-transistor circuit we have a high input impedance and good gain. The circuit is from a...