We found this circuit in a French documentation from the 80's. The components used are still common and the circuit can generate signals from 10 Hz to 100 kHz.
This circuit from the 90s has RIAA equalization with a gain of 35 dB at 1 kHz. The circuit has an...
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This simple blinker for incandescent lamp was obtained from an English documentation. The power...