Power Supply Adapter

Here is the 6V to 12V DC voltage doubler circuit design, it also called DC voltage miltiplier or DC to DC converter. This dc voltage doubler circuit will need about 2A from the 6V input supply to produce the full 800mA at 12V for the power output. This circuit is very useful to generate higher voltage from a low power source, but this circuit will deliver low output current. So it should only be used for low current driven applications. Also, the output voltage may be unstable, so a voltage regulator (IC78XX) of proper rating can be used regulation and smooth output. But voltage regulator IC itself consume some current, and reduce the deliverable current.

This is the circuit diagram of 5V to Isolated 5V Converter, rated at 20mA electric current. In this converter circuit, a negative output voltage dc to dc converter generates a -5V output at pin A. In order to generate -5V at point A. the primary of the transformer must fly back to a diode drop more negative than -5V. If the transformer has a tightly coupled I : 1 turns ratio. there will be a 5 V plus a diode drop across the secondary. The IN5817 rectifies this secondary voltage to generate an isolated 5V output. The isolated output is not fully regulated since only the -5V at point A is sensed by the MAX635.

This is a converter circuit which will convert 5VDC input to become 12VDC output. The circuit is based LT1070 which also will boost the current output. About LT1070: The LT ® 1070/LT1071 are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward,inverting and “Cuk”. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Boost Converter circuit reference, download: LT1070 datasheet

Here the schematic diagram voltage converter circuit: 12VDC to 18VDC or 24VDC: This voltage doubler circuit will convert 12-V power supply to become a 24VDC and 18VDC. Use this circuit with almost any PNP or NPN power transistor. Component Parts list: U1: NE 555 timer. C1 and C2: 50μF/25V Q1: TIP 29, TIP120, 2N4922, TIP61, TIP110, or 2N4921. Q2: TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918.

This is the circuit diagram of 6VDC to 12VDC Converter. With this circuit , you can doubled the input voltage of 6V DC to become 12V DC output voltage. Component Parts : R1, R4 = 2.2K R2, R3 = 4.7K R5 = 1K R6 = 1.5K R7 = 33K R8 = 10K C1,C2 = 0.1uF C3 = 470uF/25V D1 = 1N914 D2 = 1N4004 D3 = 12V 400mW Zener Diode Q1, Q2, Q4 = BC547 Q3 = BD679 L1 See Notes Circuit Notes : 1. L1 is a custom inductor wound with about 80 turns of 0.5mm magnet wire around a toroidal core with a 40mm outside diameter. 2. Different values of D3 can be used to get different output voltages from about 0.6V to around 30V. Note that at higher voltages the circuit might not perform as well and may not produce as much current. You may also need to use a larger C3 for higher voltages and/or higher currents. 3. You can use a larger value for capacitor C3 to provide better filtering. 4. The circuit will require about 2A from the 6V supply to provide the full 800mA at 12V. 6VDC to 12VDV Converter circuit, source: http:/...