This 3-transistor buzzer or buzzer is a classic type found in the July 1998 issue of Electronics Now magazine. The power rating depends on the output transistor.
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...