This sensitive two-transistor circuit was found in the June 1965 Radio Electronics magazine. The circuit has low drift and uses an analog instrument. The input resistance is high.
The quiescent current of the small transmitter is around 20 mA. The transmission frequency depends on...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit has an interesting application. If a device with the selector switch in the 110 V...