DC-DC Convertor with Operational Amplifier
Électronique / Electronic
Here's a DC-DC converter circuit; it can gain 5V DC from 3V DC.
Build the project, set the switch to position ON, and see how this circuit works.
Look at the schematic. IC 1 acts as an oscillator. The output of IC 1 turns on transistor Q1.
Self-induction of the transformer coil instantly generates a high voltage current.
Diode D1 rectifies this voltage and passes on a high DC voltage current.
IC 2 is a comparator that examines the voltage increase. When the input voltage to IC 2 is more than 5V, the LED lights.
By the way, did you try rotating the control? How does it affect the circuit?
In this circuit the control is used as a fixed resistor of 50K ohms. Rotating
the control has no effect.
(Sorry if we had you worried.)