Simple 12V To 24V Voltage Doubler

The Simple 12V To 24V Voltage Doubler circuit operates by using an NE555 timer IC configured as an astable multivibrator to generate a continuous square wave oscillation. This oscillating output drives a push-pull amplifier stage composed of a complementary pair of transistors—specifically the BD139 NPN transistor (T1) and the BD140 NPN transistor (T2)—which switch rapidly to supply alternating current paths for energy transfer. Resistors R1, R2, and capacitors C1, C2 set the timing parameters for the NE555 oscillator, while resistor R3 limits base current to the transistor stage. As the transistors switch, energy is alternately stored in and discharged through the charge-pump network, which includes 1N5819 Schottky diodes (D1, D2) and high-value 470µF 35V electrolytic capacitors (C3, C4). The Schottky diodes ensure fast switching speeds and low forward voltage drop, directing current flow efficiently. Through this charge-pump action, the circuit accumulates voltage across the storage capacitors, effectively stepping up the incoming 12V DC power supply connected via terminal connectors J1 and J2 to an output approaching 24V DC on a general-purpose PCB housed within a suitable enclosure.