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.
The purpose of this circuit is to restore the 0 V black level of an analog TV video signal at the...
The operational 3403 is not currently common, but a similar configuration can be made with modern...
This circuit can be tuned in a 100 kHz band around the frequency of the crystal. The transistor can be...