Using the 723 integrated circuit, this circuit was found in an article on power supplies in the August 1971 Radio Electronics magazine. The transistor may be the BD136 on a heatsink.
This Vox circuit uses a specific Motorola component. We found the circuit in the 1990 Linear...
The basic configuration for a 4017 when used as a decade divider with one-of-ten decoded outputs...
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...