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 generates a 1 MHz signal for general equipment calibration. The circuit is from an...
This simple preamplifier presents a high input impedance and can be used with microphones, piezo...
This circuit for the two-meter band of radio amateurs was found in 1980s documentation....