This circuit was found in an Electronic Design. It makes use of a relaxation oscillator to trigger an SCR and two relays. The circuit operates at frequencies of 12 to 180 cycles per minute.
This control stage or shield can be used with motors from 3 to 12 V and currents up to 3 A....
This circuit of an English publication from 1993 indicates when the active cycle of the signal under...
This two transistor preamplifier is intended for the use with three terminals electret...