Rongge

Description    This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage. Circuit diagram Parts C1, C2 2200uF 35V Electrolytic Capacitor C3, C4, C5, C7 1uF 35V Electrolytic Capacitor C6, C8 100uF 35V Electrolytic Capacitor R1, R4 5K Pot R2, R3 240 Ohm 1/4 W Resistor BR1 2A 30V Bridge Rectifier U1 LM317 Adjustable Positive Regulator U2 LM337 Adjustable Negative Regulator T1 30V Center Tapped 2 Amp Transformer S1 SPST 2 Amp Switch MISC Heatsinks For U1 And U2, Line Cord, Case, Knobs For Pots, Wire Notes Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case. U1 and U2 get quite hot and will require heatsinks. A fan is usually not needed. You can, of course, add a volt and amp meter. U1 and U2 can only go down to a minimum of +-1.2V. If you need to go lower, you can add two 1N4003 diodes...

This is the simple circuit diagram of Dual Voltage Power Supply . It is used for Misc. application. This circuit is called regulated power supply. For this reason the main component of this circuit is Regulator IC. It also needs few components to built. The regulator 7812 is the positive voltage regulator and 7912 is the negative voltage regulator.  You can also use 7809 for 9 volt positive power supply and 7909 for negative voltage power supply. It regulates voltage from 24Volt to 12 Volt (DC). The transformer input is 110Volt to 220Volt (AC) and the output must be between 12Volt to 24Volt (AC) and current must be 500mA. In this circuit some capacitors are used as a filter for removing repole.

General Description: The TA8211AH is dual audio power amplifier for consumer  applications.   This IC provides an output power of 6 watts per channel   (at VCC = 20 V, f = 1 kHz, THD = 10%, RL = 8 Ω).  It is suitable for power amplifier of TV and home stereo.  Features: High output power: Pout = 6 W/channel (Typ.)   (VCC = 20 V, RL = 8 Ω, f = 1 kHz, THD = 10%)  Low noise: Vno = 0.14 mVrms (Typ.)   (VCC = 28 V, RL = 8 Ω, GV = 34dB, Rg = 10 kΩ,   BW = 20 Hz~20 kHz)  Very few external parts  Built in thermal shut down protector circuit  Operating supply voltage range: VCC (opr) = 10~30 V (Ta = 25°C)  Circuit Diagram: Circuit diagram for Dual Audio Power Amplifier 

This is a very simple dual USB power supply controller using the isl6185 USB power controller family. Dual USB power supply electronic project that provides fully independent overcurrent (OC) fault protection for two or more USB ports. Dual USB Power Supply Controller Circuit Diagram: This product family consists of sixteen individual functional product variants and three package options and is operation rated for a nominal +2.5V to +5V range and specified over the full commercial and industrial temperature ranges. Each ISL6185 type incorporates in a single package two 71mΩ P-channel MOSFET power switches for power control and features internal current monitoring, accurate current limiting and current limited delay to turn-off for system supply protection along with control and communication I/O. The ISL6185 family offers product variants with specified continuous output current levels of 0.6A, 1.1A, 1.5A or 1.8A. Due to all integrated features this power supply circuit is very easy to...

There will be instances where the currents from each supply will be unequal. Where this is the case, the resistor divider is not sufficient, and the +ve and -ve voltages will be unequal. By using a cheap opamp (such as a uA741), a DC imbalance between supplies of up to about 15mA will not cause a problem. However, we can do better with a dual opamp (which will cost the same or less anyway), and increase the capability for up to about 30mA of difference between the two supplies. Circuit diagram: Dual Opamp Buffered Power Supply Circuit Diagram Author: http://sound.westhost.com/project43.htm