This variable 1 A power supply with voltages up to 30 V was found in an article in June 1986 Radio Electronics magazine. The 723 IC is well known to magazine readers of the time and even today.
The circuit shown in figure 1 serves to control a servo motor with a current of up to 200 mA. The...
The L3 coil is what basically determines the resonant frequency, around 1 MHz, in this oscillator found...
This circuit was found in a 1973 Radio Elettronica magazine. The Italian magazine no longer...