This circuit was found in a Philips documentation from 19678. The transistors are from the period with emphasis on the married pair. Modern equivalents can be used.
In the figure we show how to use a varicap to modulate a signal in frequency. The circuit can be...
Found in Datel's documentation from the 1980s, this circuit makes use of the company's operational...
This circuit can function as a simple shield converter from BCD to analog outputs. The circuit...