Found in an Electronics World of 1968 this circuit can use current SCRs and the diodes are according to the lamp. The Circuit only works with incandescent lamps.
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
This circuit is from an old documentation, but perfectly current. In place of the battery, 2 or 4...