We found this configuration in a 1974 publication. Transistors can be replaced with equivalents such as 2N2222. The circuit has a dynamic range of 60 dB.
This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's...
This ttransistor test was found in a 1987 documentation. It is a simple oscillator that allows to...
In the circuit of the figure we used a potentiometer of 1 k ohm. We can use a larger...