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 was found in an American documentation from the 60's. The transistors are from the...
The dual operational used in this sound effect that separates the signal into two tracks is not...
The circuit shown was found in a 1967 RCA manual. Modern equivalent components can be used. The...