This circuit was found in Siliconix documentation from the 1980s. Equivalent operational amplifiers can be used and the output current is very low.
This circuit produces a warning signal with the programmed current that can reach 4 A. The circuit is...
This circuit open and close the relay in intervals adjusted by the potentiometers. The capacitors...
The range for this transmitter is up to 100 m. The signal can be received by any circuit tuned for the...