Power Supply Adapter

This is a simple circuit design of 9V split power supply. This power supply circuit delivers plus and minus 9V to substitute the two 9V batteries. The rectifier circuit is certainly two separate full-wave rectifiers fed from the secondary of the transformer. One full-wave rectifier consists of diodes Dl and D2, which produce +9 V, and then the other consists of D3 and 4, which produce -9 V.

This is the design diagram of +15V / 1A regulated power supply using uA723. Circuit operation: The supply receives +20VDC from the rectifier / filter section (diode bridge). This is applied to pins 11 and 12 of the IC uA723, as well as to the collector of the 2N3055 series-pass transistor. The output voltage is simpled through R1 and R1, providing about 7V with respect to ground at pin 4. The reference terminal at pin 6 is tied directly to pin 5, the noninverting input of the error amplifier. For fine tuning output voltage, a potensiometer can be installed between R1 and R2. A 100 pF capacitor to pin 4 furnishes gain compesation for the amplifier .

This is the scheme design of -15V / 1A Regulated DC Power Supply . It used uA723 precision voltage regulator and TIP105 PNP Epitaxial Silicon Darlington transistor. The supply receives -20V from the rectifier/filted which is fed to the collector of the Darlington PNP pass transistor, a TIP105. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP105 is driven from Vz terminal at pin 9, which is the anode of a 6.2V zener diode that connects to the emitter of the uA723 output control transistor.

This is the schematic diagram of voltage regulator circuit with pass transostor. The regulator is based regulator IC of LM317T. The LM317T output current can be raised by utilizing an additional power transistor (on circuit, it is 2N2955) to share a portion of the total current. The amount of current sharing is established with a resistor placed in series with the LM317 input and a resistor placed in series with the emitter of the pass transistor. In the above scheme design , the pass transistor will start conducting when the LM317 current reaches about 1 ampere, due to the voltage drop across the 0.7 ohm resistor. Current limiting happens at about 2 amperes for the LM317 which will drop about 1.4 volts across the 0.7 ohm resistor and make a 700 millivolt drop across the 0.3 ohm emitter resistor. Thus the total current is limited to about 2+ (.7/.3) = 4.3 amperes.

This is the high current dc power supply circuit with 5V output. The high current regulator utilizes an extra winding or a separate transformer to deliver power for the LM317 regulator so that the pass transistors can run closer to saturation and increase performance. For excellent performance the voltage at the collectors of the two parallel 2N3055 pass transistors ought to be near to the output voltage. The LM317 needs a couple extra volts on the input side, plus the emitter/base drop of the 3055s, plus whatever is lost across the (0.1 ohm) equalizing resistors (1volt at 10A), so a separate transformer and rectifier/filter circuit is utilized which is several volts higher than the output voltage.

This is the unregulated Split power supply circuit, intended to supply the hi-fi audio amplifier. This power supply circuit is very simple, and no great skill is needed to assemble this circuit.

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.

Here the low power 12V transformerless power supply circuit with full-wave rectification. A lot of circuits could be powered straightaway in the electric mains using the support of a series capacitor (C1). The problem with this method is the fact that typically only one half cycle of the mains wave-form can be used to deliver a DC voltage. An obvious option is to work with a bridge rectifier to accomplish full-wave rectification, which improves the amount of current that can be delivered and makes it possible for the filter capacitor to become smaller sized. The associated circuit in fact does this, but in a clever manner that makes use of fewer parts. Right here we take benefit of the reality that a Zener diode can also be a standard diode that conducts electric current in the forward direction. During one half wave, the current flows via D1 through the load and back via D4, whilst during the other half wave it flows via D3 and D2. Keep in mind that with this circuit (and with the...

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.

This is the circuit diagram of split power supply circuit which will give a regulated DC voltage (+)22V ; GND and (-)22V. This is an old regulated power supply design which built using active components of dioda zeners and transistors to give regulated output. This is a very basic voltage regulator circuit, without any additional features such as foldback current limiting, and doesn't have the same performance as an IC regulator such as 78xx series.

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.

Switching power supply circuit , give you 15V DC output with 1A electric current. It will be 15 watt power output. Looks like this circuit come from Rusia, some components type might not available in your location, you should find the substitude of component parts first. Source: Switching power supply 15 Watt

The 5V regulated power supply for TTL and 74LS series integrated circuits, has to be really precise and tolerant of voltage transients. These IC's are effortlessly damaged by short voltage spikes. A fuse will blow when its electric current rating is exceeded, but demands several hundred milliseconds to respond. This circuit will react in several microseconds, triggered when the output voltage exceeds the limit of the zener diode. This circuit uses the crowbar method, where a thyristor is employed and short circuits the supply, causing the fuse to blow. This will take position in a few microseconds or less, and so provides considerably higher protection than an ordinary fuse. If the output voltage exceed 5.6Volt, then the zener diode will conduct, switching on the thyristor (all in some microseconds), the output voltage is therefore reduced to 0 volts and sensitive logic IC's will probably be saved. The fuse will nonetheless take just a few hundred milliseconds to blow ...

The following diagram is the example of dual polarity power supply circuit which will give you (+33V) ; (0) and (-33V) DC voltage. This circuit is usually used for power amplifier circuit which require dual polarity power supply to work. Components List: R1 = 3K3 1/2W C1 = 10nF/1000V C2,C3 = 4700µF/50V C4,C5 = 100nF/63V D1 = 200V 8A Diode bridge D2 = 5mm. Red LED F1,F2 = 3.15A Fuses with sockets T1 = 220V Primary, 25 + 25V Secondary, 2A minimum PL1 = Male Mains plug SW1 = SPST Mains switch source: redcircuits.com

This is the schematic diagram of Unregulated Dual Polarity power supply . Unlike 78xx and 79xx dual polarity regulated power sypply and LM317/LM337 dual polarity regulated power supply which have limited current output and voltage (have limited supply power), this unregulated power supply will give you more power. This kind of circuit usually used for power amplifier which need high supply power, or as high current lead acid battery charger (single polarity only). The component value is flexible refer to your needs. For example: if you need power supply for 100W amplifier, then the component value are: Transformer: 3A minimum (center tap) Diodes: 3A diode (1N5401, 1N5402, 1N5403 etc) Electrolytic capacitor: 4x minimum of 4700uF/50V (the higher is better - check the capacitor voltage, change it for higher voltage. example: use 63V capacitors for 45V power supply output.)

Offline switching power supply which resulting 5VDC/10A output from 110/220V AC home power electric. See the parts list, there should be different MOSFET type for 110V anf 220V volatage input. Below the diagram : And here the parts list: The schematic shows a 50-W power supply with a 5-V 10-A output. It is a flyback converter operating inside the continuous mode. The circuit has functionality of a main side and secondary side controller will full-protection from fault conditions such as overcurrent. When the fault condition has been removed, the power supply will go into the soft-start cycle just before recommencing normal operation.

Here the 9V Stabilized power supply circuit. Built based IC 723 and featured with amp booster using 2N3055. The 2N3055 must be mounted on a coolrib/heatsink. Schematic Diagram: Components List: R1 = 0.56 Ohm, 1 Watt, wire-wound type, 5% R2 = 750 Ohm, 5% R3 = 2K7 (2700 ohm) P1 = potentiometer, 1K, Linear C1 = 2200uF, 35V C2 = 470pF T1 = 115/10 VAC transformer. Center Tap (ct) not needed. IC1 = uA723, LM723, or equivalent. Q1 = 2N3055, NTE130, or substitute. (TO-3 case) Mount on a coolrib! BR1 = 80V-5A (or better) Circuit Notes: C1 filters the noise and spikes off the AC. Adjust the circuit for 9V or 12V output voltage, or whatever voltage level your pc mini drill is using, with the P1 potentiometer. Q1 can also be a MJ2955 in a TO-3 case. Design by Tony van Roon Source: http://www.sentex.ca/~mec1995/circ/9vstable.htm

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.