This circuit was obtained in an old documentation, but it is still current by the used components. The circuit must be powered by a 12 V regulated power source.
The gain of this amplifier is controlled by light shining on an LDR. The circuit is from a Radio...
This circuit produces a whistle sound when acting on switch S1. Aids is applied to a transformer that is...
This filter that rejects a frequency range determined by the double-T was found in the August 1993...