The output voltage of this circuit is approximately four times the supply voltage. The circuit is from an Electronics Now April 1995. The output current is very low.
The load controlled by this circuit depends on the triac used. The circuit is from Electronics Now magazine...
This circuit was obtained from a Philips documentation from 1970. It can be built on modern...
We found this preamplifier with 70 dB gain for microphones in American documentation from the...