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.
Found in an Electronic Engineering from the 80's, this circuit makes use of components of the...
This is a conventional double T oscillator, where the frequency is determined by the double T...
This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on...