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 circuit, found in 1980s documentation, produces a rectangular signal of the same frequency as the...
The purpose of this circuit from a 1995 publication. Its purpose is to alert a person when he...
This simple transmitter for the citizen range was obtained in a 1983 publication and has only one...