We found this circuit with SCRs and unijunction in a Radio Electronics magazine from June 1969. The SCRs must be in accordance with the controlled incandescent lamp. The circuit is powered by DC.
This circuit consists of a small inverter that can generate a few hundred volts of DC voltage...
The use of a detector bridge instead of a single diode, as is normally done in common galena...
The LM150, 250 and 350 series of 3 A are manufactured by several semiconductor industries that...