Found in a 1969 documentation, this circuit consists of a multi-oscillator with neon lamps. Observe the high supply voltage.
This configuration is from a 1964 US documentation valid for any FET. The range of power voltages...
The operational amplifier used in this circuit from a 1970s publication is no longer easily found...
This circuit was found in an old American documentation. It can operate with signals from 40 Hz to...