This circuit has a frequency range of 30 Hz to 100 kHz with an output signal of 1 Vrms. We found it in 70s American documentation. The integrated circuits are CA3140.
This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time...
This circuit was obtained from an English magazine from 1976. What this circuit does is start from...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...