We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This circuit may be modulated by a very low frequency signal, for example to obtain the vibrato...
In this circuit, the LED Will blink in a presence of na áudio signal in the input. Gain is...
This high voltage regulator uses only two passive components. The output is 100 V, but replacing...