This adjustable frequency circuit was found in December 1986, Radio Electronics magazine. The base frequency is given by C1 and the power supply must be 5 V.
This simple electronic music box circuit was found in the April 1985 issue of Radio Electronics. The...
This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time....
The power source shown for powering for small TTL circuits was found on a Radio Electronics...