Based on the well-known LM3914, this circuit was found in an old American documentation. Trimpots adjust the scale limits.
This is a commercial circuit of a transistor amplifier of some watts with the OC30 transistor. The 12 V...
With this circuit it is possible to excite direct current relays from an alternating signal,...
The reference source for this circuit is a 1968’s Motorola publication. The circuit can be...