Found in a Radio Electronics store from the 90s, this circuit is for cars of that era. The circuit uses a 2N3055 that must be equipped with a heat sink.
This circuit was obtained in an American publication from 1977. The circuit operates in the audio...
This circuit came out in a 1983 English magazine, but it can be easily assembled today, as the...
The figure shows how to use the LM3914 Bargraph with an external reference voltage source. The...