E)
This circuit uses a reversible double contact relay to obtain the trigger lock with the unijunction pulse. The relay must be of the sensitive type with at least 150 ohms of coil.
This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a...
This circuit, which can generate voltages up to 25 V, was found in the December 1992 issue of...
This circuit was obtained from a 1966 General Electric documentation. It can serve as a basis for...