Suggested by Philips documentation from 1968, this circuit uses components from the era that can be replaced by modern equivalent types. The double transistor can be replaced by a matched pair.
Based on 74HC digital circuits, this circuit generates signals in three phases. The frequency...
This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The...
The transistor of this old mixer can be the BC558 and the power can be done with batteries,...