This high impedance amplifier is from 1985 documentation by General Electronic. The amplifier with FET at the entrance is from the period and the source is 9 V.
This 4-transistor amplifier can work from 4.5 or 6 V power supplies. We found it in a Mullard...
This circuit has two stable states such that at each instant only one SCR leads. The state change is...
The figure shows how to use a 12 V signal to trigger a TTL gate using an optical coupler. The...