The circuit shown consists of a power stage for relay excitation. 2N3053 can be a BD135 and 2N406 can be replaced with a BD136. R3 depends on the trigger voltage.
This antenna preamplifier can work with signals from about 20 MHz to 100 MHz, depending only on...
This 1 kW circuit was found in documentation from the 90s. The sensor is a thermistor, and the...
This circuit was found in an American documentation from the 90's. The circuit is intended for...