Found in an Electronic Design from the 90's, this circuit measures the equivalent resistance in series of a resistor. The circuit operates at 50 kHz producing a rectangular signal.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
This circuit shows how to implement a TTL compatible oscillator using a transistor. The circuit is...