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 phonographic transmitter for the MW band in a 1956 documentation. The circuit has a...
The voltage of 30 V indicated in this project, shown in the figure depends on the diac used. It...
We find this circuit in an American 1980s documentation. The circuit drives a system that keeps a...