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.
This circuit encodes the two channel signals from an amplifier for a multiplex-stereo...
The purpose of this circuit, which we found in the November 1986 Radio Electronics issue, is to...
This circuit is from an old American documentation. In it we have a simple way to fire an SCR from...