This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
This circuit found in a European publication from the 1980s, is based on PLL 566. The frequencies...
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
This circuit causes an LED to flash at a frequency determined by capacitor C1. The circuit can be...