This circuit is from a 60's documentation. The circuit uses components from the era and serves to monitor a 150V continuous power line.
This audio generator that produces both rectangular and sinusoidal signals was found in a...
This simple circuit for a high impedance magnetic phone (500 ohms or more) has been found in a...
Found in an American publication from 1968, this circuit can be made based on a TIP42 that must be...