Found in a 1969 documentation, this circuit consists of a multi-oscillator with neon lamps. Observe the high supply voltage.
This circuit uses only passive components calculated for the desired frequency. We found it in an...
This fourth-order circuit was found on an 80's Radio Electronics. The power supply must be...
This simple circuit controls the brightness of an LED from LDRs, NTCs, PTCs or other resistive sensors....