Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
We found this circuit in an American documentation from the 60s. The circuit can be made with...
This simple circuit uses few common components and can be installed in any car. In case of...
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...