We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
This circuit was found in the September 1996 issue of Electronics Now magazine. The sound provided has...
We found this circuit in a March 1961 Radio Electronics magazine. This circuit reaches 100 MHz...
Using the M1575 this switching converter was found in National Semiconductor documentation from...