We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The transistor must be a high voltage type and the LM3900 power supply must be symmetrical.
This is another of the Star Trek red alert circuit that you can find on this site. We took this...
This step was found in the 1960 Mullard transistor reference manual. The transistor can be a BC558...
We found this circuit in the November 1975 issue of Radio Electronics magazine. It uses a digital...