The frequency of this circuit depends on C1 and, for the indicated values, it is 1 kHz. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
This simple transistor tester was found in a Japanese magazine in 1967. It tests general purpose...
Short duration pulses or "clicks" can be generated with the circuit seen in the figure. The...
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...