This circuit is from a Hands-On Electronics from the 90s. The integrated amplifiers used are well known. The range is a few tens of meters depending on the resistance of the cables.
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...