Using 4 operational amplifiers this circuit generates 4 different tones. The circuit is from an American documentation from the 90's. Operational amplifiers are tTL084.
This circuit was published in Radio Electronics magazine in August 1958 which taught how to...
This percussion circuit was found in an Electronics World of 1968. The transistor may be general...
In the figure we have an interesting circuit for those with a project that requires a sub-multiple...