An article in Radio Electronics magazine from November 1958 showed the construction of this tube audio oscillator. Note the use of lamps as a stabilizer to obtain better sinusoidal signals.
Suggested by National Semiconductor in a documentation of the 90s, this circuit uses a power...
This circuit was obtained from an American 1980s documentation. The frequency depends on the...
The sensor of this circuit is a large surface diode. We believe that a small solar cell can also...