in practice often it may be necessary to obtain a voltage greater than can give the existing power supply. Widely known voltage doubling circuit using capacitors, but, as a rule, such schemes may not provide a sufficiently high currents in the load.
In this article the variant of a fairly simple scheme, which allows to eliminate this drawback.
Chip-based digital logic can be collected Doubler DC voltage capable of delivering load currents up to 2 A, and more.
As the chip can be used MS digital logic (elements of "NAND", "NOR") type K561LA7, K561LE5 or similar. This chip is assembled pulse generator, the frequency of which is determined by generating R1C1R2 chain.
Antiphase pulses generated from the outputs of the digital key MS operated powerful transistors T1 and T2. Resistor R3 and capacitor C2 constitute a delay circuit pulses of different phase to eliminate the possibility of a short circuit at the circuit output during the switching phases.
Capacitors C3 and C4 are used to reduce the level of output voltage ripple. At high load current value of capacitance is desirable to increase to a value of 10 microfarads or more. Furthermore, in parallel with capacitor C4 will be useful to include a small capacitance capacitor (0.1... 1.0 uF), or a ceramic membrane, for better RF filtering the output voltage ripple.
The diodes in the circuit can be applied KD202 types, KD242, IN4007 or other designed for a maximum load current of the power supply. Transistors are also needed on the corresponding power.
It is possible to apply, for example, KT825 transistor, TIP126, 2N6041, BDW48 or similar. They must be installed on the radiators, the dimensions of which pick up, from the maximum output power and the type of load transistors Applied on.