This circuit of old medical documentation generates pulses in a ratio of 20 to 300 and duration of 3 ms. The circuit has biomedical applications and can use modern equivalent components.
This circuit was found in a General Electric documentation from 1966. It uses discrete components...
This circuit is from an American publication from 1970. It uses a coal microphone, which is...
This low current source without a transformer is intended for applications where insulation is not...