This circuit was found in a Philips documentation from 1967. The circuit uses components from the time that have current equivalents such as BC548 for transistors.
This is a circuit with a period component that consisted of a voltage reference. The circuit is...
The critical components of this 1978 circuit are transformers, which, hopefully, can be obtained from...
We found this circuit in the March 1991 issue of Radio Electronics magazine. The integrated...