We found this circuit in the October 1970 issue of Radio Electronics magazine. It uses the then-new CA3018 integrated circuit from RCA. Some resistors are required for best performance.
This circuit was obtained from an English magazine from 1977. It is a toy musical instrument that...
The presented circuit uses common transistors that can be the BC549. The maximum amplitude of the...
This is the receiver for the previous circuit, also found in 90s Radio Electronics. The circuit...