Found in a 303 Circuits from the 90's this circuit can use the lowest current range of a common multimeter. The circuit can measure currents as low as 100 pA.
Found in a 1964 Electronic Design, this circuit generates pulses based on an avalanche diode of...
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
This circuit produces low frequency sinusoidal signals. The circuit is a phase shift oscillator...