This 800 Hz sinusoidal oscillator was found in a 1970s American documentation. The transistor supports a modern general-purpose equivalent. The frequency is given by the RC network that can be changed.
This circuit has a very high input resistance to excite a 0-1 mA indicator instrument. The FET...
The integrated circuits used in this configuration are not common today. The circuit is from the...
The circuit shown uses the 741 operational amplifier, but lower noise and higher gain equivalents...