This sound effect circuit is from a Radio Electronics magazine from December 1969. The transistors support equivalents and the power is provided by a battery to reduce the possibility of noise.
This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any...
This circuit was found in Ferranti's 1974 transistor manual. Transistors are general purpose types...
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...