This circuit that draws 1 out of 8 LEDs was found in an 80's American documentation. The circuit can also work with an astable using the 555 instead of the 4046 which is not a common component today.
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...