Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76 dB gain. The double transistor can be replaced by a matched pair.
Also suitable for use as a noisy alarm, this Morse Code or telegraph practice oscillator was found...
This circuit makes simultaneous control of two up to 150 W incandescent lamps. The circuit is half wave...
This circuit was found in an old documentation from Europe. The integrated circuit used is...