This circuit with two transistors was found in ancient European documentation. Transistors support equivalents. The indicator on this circuit is an ordinary 50 to 100 mA lamp.
This circuit is from an English magazine of 1974, but can still be assembled with the replacement of...
This circuit, using a unijunction transistor (UJT), converts a voltage applied to the input in a...
This circuit was found in documentation from the 80s. The circuit did not include resistors from...