Circuit Power Supply

Here are some applications of the Cockroft-Walton voltage doubler circuit for generating high voltages from a low voltage AC source. The circuit is quite practical for generating thousands of volts (or more) or just a few volts at high current. Since the circuit is AC-coupled it may be connected to a power supply’s secondary transformer winding to generate an additional or opposite polarity voltage.

Source:
http://www.techlib.com/files/voltmult.pdf

A 555 is used as an oscillator, optimally around 15.76KHz (in North America). Power pins on the chip (pin 1 to ground, pin 8 to +12V) are not shown on the diagram. The output from the 555 is then switched by PNP transistor Q1 and by the large 2N3055 NPN power transistor. Q2 must be adequately heatsinked as well since it may well switch over an amp during operation. Output terminals are then connected to a primary winding of the flyback. The average flyback has up to ten primary terminals and one secondary (the secondary identified as the thick, insulated, wire protruding from the top of the unit).

Source:
http://technology.niagarac.on.ca/staff/mcsele/lasers/HighVoltage.html

Features
* 1.25 - 15VDC
* 0.5A @ 8V; 0.3A @12V; 0.2A @ 15V
* Short Protected IC Thermo

This is a basic regulated power supply. There is a transformer, two diodes, two capacitors, a regulator, and a potentiometer to set voltage. In addition, there is a diode and an LED. Useful for a cheap home bench setup, or even as a backup secondary bench power supply for work. It’s also quite compact.

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