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 circuit enables the bilateral command of triacs with the use of low current switches. The...
This circuit was obtained in a 1975 magazine and can be implemented with BC548 transistors. The...
Found in a Popular Electronics from the 90s, this circuit is intended to measure the harmonic...