Power Supply Adapter

This is the very simple general purpose variable power supply capable of delivering 0-15V DC output with about 1A electric current. The power supply circuit has regulated output and can be used for most small electronic circuit application.

This is the variable DC power supply circuit. This power supply has regulated output, can be adjusted from 3 to 25 volts and the current output is limited to 2 amps as shown, however it may possibly be improved up to 3 amps or more by applying a smaller current sense resistor (0.3 ohm). Voltage regulation is controlled by 1/2 of a 1558 or 1458 op-amp. The 1458 may be substituted in the circuit, but it is suggested the supply voltage to pin 8 be limited to 30 VDC, which can be achieved by adding a 6.2 volt zener or 5.1 K resistor in series with pin 8. The 2N3055 and 2N3053 transistors need to be attached on proper heatsinks and the current sense resistor must be rated at 3 watts minimum.

Variable lab power supply 0-24V / 4A, it is a laboratory power supply with output voltage continuously adjustable from 0 V to 24 V DC, remote voltage sense capability (Sense internal/external). It has output current limit which is continuously adjustable from 0.04 A to 4 A and output current which can be limited continuously or output shut down (Limit/cut). Remote sensing means that there are actually two extra wires which sense the delivered voltage at the load and compensate for any voltage drop along the cables which carry the delivered electric current. This improves voltage regulation at the load significantly but needs two extra wires for the sensing. A switch will allow internal sensing at the output terminals for easier operation when remote sensing isn't necessary. Read the detailed explanation about Variable Lab Power Supply 0-24V / 4A

This the variable power supply with regulated output. The circuit can be altered from 3V to 25V and the electric current is limited to 2 amps as shown. But it's possible to be increased to 3 amps or more by applying a smaller current sense resistor (0.3 ohm). The power transistor 2N3055 and 2N3053 is used to boost the output current and it should be mounted on suitable heat sinks and the current sense resistor should be rated at 3 watts or more.

This is 1.5V-25V DC Variable Power Supply. The power supply use KR142EN14 or LM317 as regulator component . KR142EN14 or LM317 is capable to handle electric current up to 2A. You may use LT1083/84/85 to handle electric current of 7A/5A/3A. Resistor R9 is used as a current sensor to an ammeter. Components list: R1 : 4K3 R2 : 18K R3 : 100 R4,R8 : 100K R5 : 1K R6 : 240 R7 : 4K7 ( Variable resistor ) R9 : 0.33 E C2 : 0.1uF C3 : 10000uF/40V C4 : 100uF/25V D1 : KY202 D2 : KD521 D3 : D311 D4 : KC147 T1 : KT814B T3 : KT209 T4 : KT3102 IC1 : KR142EN14 (LM317) Circuit source: 1.5V-25V power supply with preregulator

Parts list: TR = 2 x 15 volt (30volt total) 6+- amps D1...D4 = four MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 (1N5408) diodes. F1 = 1 Amp F2 = 10 amp R1 = 2k2 2,5 Watt R2 = 240 ohm R3,R4 = 0.1 ohm 10 watt R7 = 6k8 ohm R8 = 10k ohm R9 = 47 0.5 watt R10 = 8k2 C1,C7,C9 = 47nF C11 = 22nF C2 = 4700uF/50v - 6800uF/50v C3,C5 = 10uF/50v C4,C6 = 100nF C8 = 330uF/50v C10 = 1uF/16v D5 = 1N4148, 1N4448, 1N4151 D6 = 1N4001 D10 = 1N5401 D11 = LED D7, D8, D9 = 1N4001 IC1 = LM317 T1, T2 = 2N3055 P1 = 5k P2 = 47 Ohm or 220 Ohm 1 watt P3 = 10k trimmer This is definitely an simple to create power supply which has reliable, clear and regulator 0 to 28 Volt 6/8 Ampere output voltage. By using two 2N3055 transistor, you'll get two times the amount of electric current. Although the 7815 power regulator is going to kick in on brief circuit, overload and thermal overheating, ...

The output voltage of this power supply circuit can be adjusted from 6 volt to 12 volt. The output voltage is regulated by Q1. Parts List: R1 = 470 ohm, 5% R2 = 1K, 5% P1 = 10K ohm Potentiometer C1 = 1000uF/25V T1 = 115[220]/8VAC transformer. Center Tap not needed. Q1 = 2N1613, NTE128, or substitute. (TO-39 case) On coolrib! BR1 = 40V, 4A. (Check max current of your mini-drill and add 2A) Notes: C1 filters the noise and spikes off the AC. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. 10K-potentiometer used to adjust the output voltage. The transformer input voltage refer to your home power source. You may change the bridge diode with four rectifier diodes.

The following circuit diagram is a variable power supply which controlled by PIC microcontroller. The LCD display is used to showing the actual value of output current voltage. This is a digital power supply, use the push on switch to adjust the output voltage and current value. Schematic Diagram : Visit the digital power supply circuit page for detail explanation

This is a negative adjustable power supply. The power supply is regulated based on LM337T regulator IC. The LM337T is a regulator for negative voltage. This power supply output current is 1.5A max. Schematic diagram: Power Supply Input: Component part list: R1 = 330 R2 = 1K VR1 = 10K 10-turn trimpot C1 = 2200uF/50V C2,4 = 100nF ceramic C3,4 = 10uF/63V D1-6 = 1N5403 REG IC = LM337T Heatsink This circuit is available in kit module at electronickits.com, you may buy the this power supply kit there. Here the manual of the kits which containing the schematic diagram, part list and the explanation of the power supply circuit.

Below is a positive regulated adjustable power supply based on LM317T regulator IC. The LM317T is a regulator for positive voltage. This power supply output current is 1.5A max. Schematic diagram: Power Supply Input: Component part list: R1 = 330 R2 = 1K VR1 = 10K 10-turn trimpot C1 = 2200uF/50V C2,4 = 100nF ceramic C3,4 = 10uF/63V D1-6 = 1N5403 REG IC = LM317T Heatsink This circuit is available in kit module at electronickits.com. Here the manual of the kits which containing the schematic diagram, part list and the explanation of the power supply circuit.

This is a digital variable power supply circuit which controlled using microcontroller chip PIC family. Circuit Diagram : For detailed information, visit this Digital PIC Power Supply circuit page

Here the another variable power supply which have adjustabled output voltage from 6-12 DC volt. Parts List: T1 = 115[220]/8 VAC transformer. Q1 = 2N1613, NTE128, or substitute. Use heatsink! BR1 = 40V, 4A. (Check max current of your mini-drill and add 2A) R1 = 470 ohm, 5% R2 = 1K, 5% P1 = potentiometer, 10K C1 = 1000uF, 25V Notes: C1 filters the noise and spikes off the AC. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. The output voltage is variable with the 10K-potentiometer. The transformer input voltage refer to your home power source.

Below general power supply circuit has 2 static output type, stabled output at 5VDC and adjustabled output or variable output. Here the circuit diagram : The circuit is based on the regulator IC 7805 . It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800 series provides up to 1 amp load current and has on-chip circuitry to shut down the regulator (rather than blowing out) if any attempt is made to operate it outside its safe operating area. (If this happens to you, let the chip cool down and attach the heatsink.). Visit this page more detail about general power supply.

Featured with short circuit protection and overload protection, this variable regulated power supply will is very nice for your electronic equipments. The voltage output range will be 3-30 volt DC with 3A current. Download the manual of this circuit include the schematic diagram and part list from HERE Source: circuitdiagram.net

This is an adjustable power supply circuit , also known as variable power supply. . You may use this circuit for general purpose usage. Here the schematic diagram : Component list: R1 = 560R 1/4W C1 = 100nF R2 = 1,2 K 1/4W C2 = 2200uF 35-40V R3 = 3,9 K 1/4W C3 = 100 pF R4 = 15K 1/4W C4 = 100uF/ 35V R5 = 0,15R 5W D = B40 C3300/2200, 3A rectifier bridge P1 = 10K potesiometer TR1 = BD 135 ...

This is variable power supply for multi purpose usage and very useful to supply your electronic tools or your projects. Voltage range will be 0.7 - 24V and the urrent limiting range is 50mA - 2A. Components: P1____________500R Linear Potentiometer P2_____________10K Log. Potentiometer R1,R2__________2K2 1/2W Resistors R3____________330R 1/4W Resistor R4____________150R 1/4W Resistor R5______________1R 5W Resistor C1__________3300µF 35V Electrolytic Capacitor (see Notes) C2_____________1µF 63V Polyester Capacitor D1,D2_______1N5402 200V 3A Diodes D3____________5mm. Red LED Q1___________BC182 50V 100mA NPN Transistor Q2___________BD139 80V 1.5A NPN Transistor Q3___________BC212 50V 100mA PNP Transistor Q4 _________2N3055 60V 15A NPN Transistor T1____________220V Primary, 36V Center-tapped Secondary 50VA Mains transformer (see Notes) PL1___________Male Mains plug SW1___________SPST Mains switch Notes: P1 sets the maximum output current you want t...

This inexpensive variable power supply circuit with L200. The output current is up to 2A and the output voltage depends to the output voltage from transformer. VR 47R used for current adjustment and the VR10K used for output voltage adjustment.

This is regulated variable power supply circuit based on Transistor LM338. Short circuit protection added in this circuit .

This is a simple but reliable power supply circuit based one of the oldest integrated voltage regulators of them all - the LM723. Please visit this page for complete explanation.

Component parts list: P1____________500R Linear Potentiometer P2_____________10K Log. Potentiometer R1,R2___________2K2 1/2W Resistors R3____________330R 1/4W Resistor R4____________150R 1/4W Resistor R5______________1R 5W Resistor C1___________3300µF 35V Electrolytic Capacitor (see Notes) C2______________1µF 63V Polyester Capacitor D1,D2________1N5402 200V 3A Diodes D3_____________5mm. Red LED Q1____________BC182 50V 100mA NPN Transistor Q2____________BD139 80V 1.5A NPN Transistor Q3____________BC212 50V 100mA PNP Transistor Q4 __________2N3055 60V 15A NPN Transistor T1_____________220V Primary, 36V Center-tapped Secondary 50VA Mains transformer PL1____________Male Mains plug SW1____________SPST Mains switch Notes: P1 sets the maximum output current you want to be delivered by the power supply at a given output voltage. P2 sets the output voltage and must be a logarithmic taper type, in order to obtain a more linear scale voltage indication. Yo...