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 simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
This elementary receiver with only one germanium transistor was found in a Japanese publication from the...
This simple 1 transistor circuit was found in an American documentation from the 60's. The...