We found this time base of 0.1 to 90 seconds in a circuit manual from the 90s. The single-use transistors used are common and the frequencies given by the adjustment by the potentiometer.
We found this circuit in Radio Electronics magazine. It triggers a load (relay) by the noise from...
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...
The LM105 integrated circuit consists of a voltage regulator integrated in a metallic enclosure. The...