This circuit is used in transceivers, enabling input selection by diode switching through polarity reversal. The circuit is from an old American documentation on telecommunications.
This circuit uses a photo-transistor to trigger a circuit sourcing a square signal for the output. The...
This circuit makes use of an uncommon integrated circuit. It can provide a power of 6 W when...
The circuit is from an 80's publication, but the components are current, only special type diodes...