Story
Variable stabilizer for low voltages
The presented circuit allows to obtain stabilized voltages between the limits 1.2-9V.
The 'series' transistor Q2 is controlled by the differential applicator consisting of transistors Q1 and Q3. This amplifier compares the voltage collected from the 2k5 RV1 potentiometer and the stabilized fixed voltage from the 5V6 Zener diode. A dual parametric stabilization source with two Zener diodes was used to increase the stabilization coefficient of the entire circuit. The role of the 1nF capacitor is to prevent possible unwanted oscillations in the RF field.
Bill of materials available in the download section, and the schematic as well.
Give it a try!
