This circuit was found in a Motorola documentation from 1968. The load current is 10 A. The components used are from that time and information about the transformer is not given.
This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be...
This is the previous version, but with a simplification given by the use of the 7404 and 7408...
In the figure we present a circuit of a microphone signal conditioner using the SSM2167 integrated...