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 [...]

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 [...]

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 [...]