This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
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...