Showing posts with label regulated. Show all posts
Showing posts with label regulated. Show all posts
Sunday, November 2, 2014
3V DC to 5V DC REGULATED POWER SUPPLY ELECTRONIC DIAGRAM
3V DC to 5V DC REGULATED POWER SUPPLY ELECTRONIC DIAGRAM
A 5V DC regulated output from 2 cells 3V DC batteries. The output current of the circuit is limited to 50mA. However, it still able to supply many microcontroller circuits. 3009 and 560R Resistor provide the 5V DC output, make up a voltage divider network.
Saturday, October 25, 2014
How To Build Regulated Power Supply with Stability at 3A
The circuit was designed to build a Regulated Power Supply with Stability at 3A will provide a regulated voltage from 40 V to 70 V in a 3 A current.
- 2N3055 – a complementary Silicon Epitaxial-Base planar NPN transistor mounted in Jedec TO-3 metal case for use as power transistor.
- BD243 – an epitaxial-base Silicon NPN transistor intended for wide variety of high speed switching and power amplifier applications such as series and shunt regulators, and driver and output stages of high-fidelity amplifiers.
- BC303 – a PNP silicon planar epitaxial transistor used for AF drivers & outputs, for AF medium power amplifiers, and for switching applications up to 1 A.
There are times when some applications are requiring a regulated power supply that has relatively high output voltage and stability. All of these features are being attained in the design of this circuit. The voltage output of the circuit can range from 40 V up to 60 V while carrying a current of 3 A while providing stabilization. The construction of the circuit is very simple since the components used were available easily in the market. The only thing that matters is how the connection will be ensured.
During the operation, when the circuit is delivering 50 V up to 60 V, the transistor Q1 will be hot enough and would require a large heatsink. For voltage output higher than 50 V up to 70 V, the stability of the circuit may be found unsatisfactory. This is the reason why the ideal output voltage of the circuit is 45 V up to 60 V. In order to alter the output voltage from 40 V up to 70 V, a 470 Ohms potentiometer RV1 is used for the adjustments. However, the potentiometer may also be replaced by two constant resistors with suitable values when the circuit adjustment has been done. This is due to the fact that the use of a potentiometer may lead to a 3 V of over voltage.
As a reminder, the positive output of the circuit should be connected at point A while the 0 V output should be connected at point B. The 0 V reference should not be connected to the ground for the circuit to function properly. the use of this 3 A power supply with an average of 50 V circuit may be found on various applications that normally requires this rating.
Since this type of circuit is easily built, it is being utilized in industrial, educational, clinical, and laboratory facilities. It may come with different additional features such as reduced ripple & noise, overload protection, and short circuit & high current protection.
Since this type of circuit is easily built, it is being utilized in industrial, educational, clinical, and laboratory facilities. It may come with different additional features such as reduced ripple & noise, overload protection, and short circuit & high current protection.
Saturday, September 20, 2014
Simple 5V Regulated Power Supply Wiring diagram Schematic
5V Regulated Power Supply Circuit Diagram is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but usually their voltage regulation is very poor, which makes then not very usable for digital schema experimenter unless a better regulation can be achieved in some way.
The following schema is the answer to the problem. This schema can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The schema has overload and thermal protection. The capacitors must have enough high voltage rating to safely handle the input voltage feed to schema. The schema is very easy to build for example into a piece of veroboard.
The following schema is the answer to the problem. This schema can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The schema has overload and thermal protection. The capacitors must have enough high voltage rating to safely handle the input voltage feed to schema. The schema is very easy to build for example into a piece of veroboard.
5V Regulated Power Supply Circuit Diagram
Parts:C1 = 100uF-25V electrolytic capacitor, at least 25V voltage rating
C2 = 10uF-25V electrolytic capacitor, at least 6-16V voltage rating
C3 = 100nF-63V ceramic or polyester capacitor
IC = 7805 regulator IC
ICs Pinout :
- Unregulated voltage in
- Ground (See Diagram)
- Regulated voltage out
Circuit features:
- Gives out well regulated +5V output, output current capability of 100 mA
- Built-in overheating protection shuts down output when regulator IC gets too hot
- Very simple and easy to build
- Very stable +5V output voltage, reliable operation
- Easy to get components, uses only very common basic components
- Based on datasheet example schema, I have used this schema succesfully as part of many electronics projects
- Part of electronics devices, small laboratory power supply
- Wide range of input unreglated DC 8-24V power supply
- Few dollars for the electronics components + the input transformer cost
Modification Iideas
More output current:
If you need more than 150 mA of output current, you can update the output current up to 1A doing the following modifications.
- Change the transformer from where you take the power to the schema to a model which can give as much current as you need from output
- Put a heatsink to the 7805 regulator (so big that it does not overheat because of the extra losses in the regulator)
More output voltages:
If you need other voltages than +5V, you can modify the schema by replacing the 7805 chips with another regulator with different output voltage from regulator 78xx chip family. The last numbers in the the chip code tells the output voltage. Remember that the input voltage muts be at least 3V greater than regulator output voltage ot otherwise the regulator does not work well.
Sunday, August 31, 2014
2 5A 1 25 To 25V Regulated Power Supply Wiring diagram Schematic
This power supply uses an LM317J adjustable regulator and an MJ2955 pass transistor. Ql and U2 as well as Ul should be heats inked. A suitable heat-sink would typically be 4` 4` 1` fins, extruded type, because up to 65 W dissipation can occur. R8 and R9 should be 1% types or selected from 5% film types with an accurate ohmmeter. Capacitors are disc ceramic except for those with polarity marked, which are electrolytic. D1, D2—1-A, 100-PIV rectifier diode. DS1—Red LED. F1 —1,5-A, 3AG fuse in chassis-mount holder. J1, J2—Standard five-way binding post, one red, one black. M1—Milli-ammeter, 0-1 mA dc. Q1—NPN power transistor MJ2955 (Radio Shack) or equiv device with a + 70-V, 10-A, 150-W rating in a -204 case. R1, R2, R7—5-W wire-wound resistor. See Notes 3 and 4 for source, or, use 17 inches of no. 28 enam wire, single-layer wound, on a 10-KOhmhm, 1-W carbon-composition resistor for R1 and R7. For R2, use 36 inches of no. 30 enam wire on a 10-KOhmhm, 1-W carbon composition resistor (scramble wound). R-4—Panel-mount, 5-kfi, 2-W or 5-W potentiometer, carbon or wire wound (See Note 8). R8, R9—See text. 51—SPST toggle switch. 52—DPDT toggle or rotary wafer switch. T1—25.2-V, 2.75-A power transformer (see text). U1—6-A, 200 PIV bridge rectifier with heat sink. See text. U2—LM317T +1.25- to 30-V, 1.5-A 7-220 regulator. Use an LM317HVK (T0-204 case) for dc output voltage greater than 40. See text.
2.5A-1.25 To 25V Regulated Power Supply Circuit Diagram
Saturday, August 30, 2014
15 V output regulated power supply circuit with uA723 and 2N3055
The supply receive from 220 /120/110 Volt AC , then lowered by the transformer . Then receives +20 Volts DC from rectifier / filter section. This applied to pin 11 and 12 of the IC uA723/LM723 , as well as to the collector of the 2N3055 series pass transistor. The output through R1 and R2, providing about 7 V with respect to ground at pin 4. The reference terminal at pin 6 is tied directly to pin 5 , the non inverting input of the error amplifier . For fine trimming the output voltage , a potentiometer can be installed between R1 and R2. A 100-pF capacitor from pin 13 to pin 4 furnishes gain compensation for the amplifier.
Base drive to the 2N3055 pass transistor is furnishes by pin of the uA723. Since desired output of the supply is 1 Ampere, maximum current limit is set to 1,5 Ampere by resistor Rsc whose value is 0,422 Ohm. A 100uF electrolytic capacitor is used for ripple voltage reduction at the output. A 1 kOhm output resistor provides stability for the power supply under no - load conditions. The 2N3055 pass transistor must be mounted on an adequate heatsink.
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