The starter circuit shown in the figure was found in an old European documentation. The circuit makes use of an SCR which is still common and the diac can be of any type.
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
This circuit includes the amplifier for the signals, being fully transistorized and using varicap...
The figure shows how to use a 12 V signal to trigger a TTL gate using an optical coupler. The...