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The above is an amplifier circuit using supply voltages from 6 volts DC to 12 Volt DC. Power output of the amplifier is quite low with only 1 Watt 8 ohm impedance. You can apply this to the audio signal amplifiers that require strengthening are not so large as in the pocket radio. Part List : R1 =  100K R2 = 39R R3 = 100R C1 = 100nF C2 = 100uF C3 = 100uF C4 = 100uF C5 = 470uF C6 = 100nF C7 = 68pF C8 = 1nF C9 = 47uF IC = SFC2790C

Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, adjustable between 1.5 and 35 volts at 1 ampere. This circuit is ready to use, you just need to add a suitable transformer. This circuit is thermal overload protected because the current limiter and thermal overload protection are included in the IC. Picture of the circuit: 1A Regulated Power Supply Circuit Schematic Circuit diagram: 1A Regulated Power Supply Circuit Diagram Transformer selection chart: Transformer selection Guide-Table For Power Supply Parts: IC = LM317 P1 = 4.7K R1 = 120R C1 = 100nF - 63V C2 = 1uF - 35V C3 = 10uF - 35V C4 = 2200uF - 35V D1-D4 = 1N4007 Features: Just add a suitable transformer (see table) Great to power your projects and save money on batteries Suitable as an adjustable power supply for experiments Control DC motors, low voltage light bulbs, … Specifications : Preset any voltage between 1.5 and 35V Very low ripple (80dB rejection) Short...

The switching regulator power supply used LM2575-5.0 on this schematic. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x The output current) is consumed as the heat with the regulator. Because it is, the efficiency isn�t good. Data sheet for LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator http://www.national.com/pf/LM/LM2575.htm

This is a simple Volt meters & ampere meter with PIC. This circuit used to measure voltage and current simultaneously. The series of volt meters & ampere meter with PIC16F876A PIC is used as a data processor voltage and current are measured.   Simple Volt meter Circuit Diagram   This circuit uses the viewer in the form of 16 × 2 LCD used for the data menmpilkan voltage and current measurements. In the article volt meter and ampere meter with PIC are discussed kerannya limited to devices only. More detail can be seen from the image sequence volt meter and ampere meter with PIC below. 

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. Simple Dual Voltage Power Supply 12 Volt Circuit Diagram 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.