Forum Diagram: supply

Showing posts with label supply. Show all posts

Friday, December 12, 2014

Plus and Minus DC Power Supply

This is a classic example of a regulated DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter.

Wednesday, November 19, 2014

Simple Power Supply with 2 transistors

Power Supply in this post is using a regulator which is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage. Power Supply has an adjustable output with a range of 6-12 VDC. The part that serves as a power regulator is Q1 TIP31. Then the controller output voltage is a voltage divider composed of R3, R4, VR1 and R2 provide bias to the base of Q2 to control the power regulator Q1. In a series of power supply is mounted 5.1 V zener diode which serves to make the minimum limit the output voltage with Q2.

Power Supply With transistor circuit is quite simple and can be made with the PCB holes, so for those who want to try to directly mempraktikannya. May the power supply circuit can be useful for readers, especially for friends who need a power supply circuit with the regulator transistor.

Thursday, November 13, 2014

3 30V 3A Adjustable Regulated DC Power Supply

This power supply is meant as an auxiliary or as a permanent power supply for all common circuits based on a stabilized DC voltage between 3 and 30V provided that the consumption does not exceed 3A. Of course this power supply unit can also be used for other purposes. Be replacing the trimmer by a potentiometer, it may even be used as an adjustable power supply unit. A good quality heatsink must be used.
[...]
Parts list:
R1 = 8.2K
R2 = 2.2K
R3 = 680R
R4 = 1K
R5 = 82K
R6 = 0.18R/5W
C1 = 470p
C2 = 100nF-63V
C3 = 100nF-63V
C4 = 100uF-63V
C5 = 10KuF-60V
D1-D6 = 6.6A
Q1 = MJ3001 (Darligton)
IC1 = UA723D

Specifications:
* Overload protected
* Sshort-circuit stable
* Output current: max. 3A
* Output ripple voltage: 0.5mV
* Output voltage: adjustable from 3 to 30V, stabilized
* Input voltage: 9 to 30V AC (depending on the desired output voltage)

Source: http://www.extremecircuits.net/2010/02/3-30v-3a-adjustable-regulated-dc-power.html

13 8V 20A DC Power Supply

The following DC Power supply circuit is a linear power supply (using transformer). The voltage output of 13.8V power supply is highly regulated, can be adjusted in the moderate range, at up to 20A continuous current. This power supply is suitable for use for amateur radio equipment. DC Power supply is easily constructed and suitable for heavy duty because it is very efficient, small and lightweight.

In the DC power supply presented here, the pass transistors are located in the negative rail and connected in common-emitter configuration rather than as emitter-followers. Thanks to this, the regulator’s minimum voltage drop is extremely low, only about 0.1V for the transistors plus 0.5V for the equalizing resistors.

DC Power Supply Circuit

The other advantage is that the collectors are directly connected to the negative pole of the power supply’s output, which in most applications is grounded. That means that no insulation is required between the transistors and the grounded power supply cabinet! This eases the cooling very considerably. Thanks to the low regulator drop, a low cost 25V filter capacitor can be used.

Some Notes of DC Power Supply Circuit

Use a transformer for the primary voltage you need. The 3A fuse is for 220 or 240V primaries. If you use something in the neighborhood of 110V, use a 6A fuse.
The rather high transformer rating of 35A accounts for the losses that occur due to the capacitive input filter. If your transformer is rated for capacitive input, then a 25A value is enough.
Of course you can make up C1 by placing several smaller capacitors in parallel. Likewise, the 0.1 Ohm, 5 Watt resistors can be made up by several in parallel, for example by 5 resistors of 0.5 Ohm, 1 Watt each.
The LM336Z-5.0 voltage reference IC should not be replaced by a zener diode. Zeners are not nearly as stable. A different voltage reference IC can of course be used, if R2 and R3 are modified for the different voltage.
D1 and Q2 through Q6 need heatsinking. Only Q2 needs insulation. D1 dissipates up to 60W, Q2 up to 25W, while the pass transistors dissipate up to 30W each in normal use, but may reach a level of 130W during short circuit! Take this into account when choosing the heat sink!
R5 exists only to make sure that the transistors can actually be driven off. The 741 is not a single-supply operational amplifier, so it cannot drive its output very low. If a true single-supply opamp is used, then R5 becomes unnecessary.

Friday, October 31, 2014

Operational Amplifiers with Power Supply

The single feed mode has become very important in systems powered from a single power supply, because it reduces the cost of circuits with operational amplifiers and also makes it easier to use on mobile devices. In this series of articles will look at various ways that can power amplifiers circuits using operational amplifiers with single power supply (single rail).

The diagram of a sound amplifier, which operates with a single power supply shown in Figure 16. In this circuit one end of the signal source connected to the right input terminal of the operational amplifier, and the other end connected to the bias voltage VBias.

The load resistance (RL) and R1 also associated with the bias voltage. The voltage at the right input terminal, VP, is equal to:

Vp = VBias + Vin

The voltage at the reverse input terminal VN, is equal to:

VN = VD + VP but because,

Vd = 0 we have:

VN = VP = Vin + VBias

without an input signal

Vin = 0, so therefore

Vn = Vp = VBias

Figure 16. Amplifier with single power supply.

Figure 17. Input and output waveforms of the amplifier of Figure 16.

The bias voltage (VBias) is typically equal to half the voltage of the power supply. The output voltage of this amplifier can be calculated as follows:

The current I1, which flows through the resistor R1, is approximately equal to the current I2, which flows through the resistor R2, and thus I1 = I2. The current flowing through R1 is equal to the difference voltage across R1 divided by the value of R1, ie

In this circuit VB is the voltage applied to the right end of R1, and VA is the voltage applied to the left end of R1.

From the figure 16 we see that:

VB = VP but VP = VBias + VIN, thus:

VB = VBias + VIN

We also have VA = VBias so:

Similarly, the current I2 flowing through the resistor R2, is equal to the difference voltage across the R2.

i.e. VR2 = VO - VB divided by the value of R2

We also have VB = VBias + VIN, thus:

Figure 18a. AC amplifier with simple power supply.

Since I1 = I2, we obtain:

Rearranging we get:

By multiplying both sides of this equation with R2 we get:

So in the absence of an input signal, ie when VIN = 0, the above equation becomes

or VO = VBias

So in the absence of an input signal, the input terminals and the output terminal of the operational amplifier have the same voltage (VBias).

If an input voltage 2 volts peak to peak, is applied to the amplifier shown in Figure 16, R1 = R2, and VCC = 10V, then when the input signal is at the positive peak value of +1V, the output voltage will be:

When the input signal changes is at its highest negative value -1V, then the output voltage equals:

So when the input signal changes from -1V to +1V, the output voltage varies from +3V to +7V.

Figure 17 shows waveforms of the input and output. Notice that the first term in equation 1 represents the voltage gain of a conventional amplifier using a double power supply. The voltage gain is given by the following relationship:

In a conventional non-inverting amplifier, which operates with double supply, the bias voltage VBias is equal to 0 volts, and the output voltage is given by the following equation:

Sunday, October 5, 2014

10 Amp 13 8 Volt Power Supply

10 Amp 13.8 Volt Power Supply Circuit

10 Amp 13.8 Volt Power Supply Parts List :

R1 1.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)
R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)
R4 270 Ohm ¼ Watt Resistor
R5 680 Ohm ¼ Watt Resistor
R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)
R8 2.7K ¼ Watt Resistor
R9 1K Trimmer Potentiometer (RS271-280)
R10 3.3K ¼ Watt Resistor
C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)
C5 100 Picofarad Ceramic Disk Capacitor
C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)
IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.
Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)
Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)
S1 Any SPST Toggle Switch
F1 3 Amp Fast Blow Fuse
D1-D4 Full Wave Bridge Rectifier (RS276-1185)
T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Digi-Key HM538-ND)

Friday, September 19, 2014

Solar Power Supply

This circuit delivers either 4.8 or 7.2 V regulated at 15 mA with a 3-V input from a bank of photocells. Rl should be 453 kQ for a 7.2-V output and 274 РЁ for a 4.8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting suitable solar cells.

Solar Power Supply Circuit diagram :

Tuesday, September 16, 2014

Fixed Voltage Power Supply

The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A. Fixed Voltage Power Supply Circuits diagram : Parts : Part Total Description C1 1 2200uF 35V Electrolytic Capacitor C2, C4 2 0.1uF Ceramic Disc Capacitor C3 3 10uF 35V Electrolytic Capacitor

D1, D2 1 1N4007 Silicon Diode

BR1 1 2A 30V Bridge Rectifier

U1 1 Regulator (See Notes) T1 1 Transformer (See Notes) S1 1 SPST 2 Amp Switch F1 1 2A 250V Fuse and Holder Misc 1 Heatsink For U1, Line Cord, Case, Wire

Notes :

Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.
U1 will reauire a heatsink.
You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.

Saturday, September 13, 2014

0 5V Negative Supply Wiring diagram Schematic

This is a Simple 0.5V Negative Supply Circuit Diagram. This simple schema consists of two LEDs and a photo diode. It generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op amp diagram, which need to have a true zero volts output. Note: This diagram is not particularly efficient.

Simple 0.5V Negative Supply Circuit Diagram

Tuesday, September 2, 2014

Universal Power Supply Circuit with IC LM317

This circuit is universal power supply , you can use this circuit to supply . On the IC you can adjustable regulator provides short circuit protection and automatic voltage adjust . The input voltage to the circuit regulator is supplyed by AC 220 V / 110 V and down voltage by transformator then rectified by bridge diode . And output voltage is clear and stabilized .

See Universal Power Spply Schematic below :

Wiring a second LM317 , U2 , in parallel with U1 is a quick and clean way to increase the current limiting threshold to 3A without sacrifing short-circuit protection.When more than 3A is required , the regulator module can be used to drive the base of one or more pass-transisotrs.

Thursday, August 28, 2014

Simple Universal Laboratory Power Supply Wiring diagram Schematic

This is the Simple Universal Laboratory Power Supply Circuit Diagram. The value of the design lies in the use of IC1, an LM317HVK adjustable s.eries-pass voltage regulator, for broad-range performance remainder supplies voltage-setting and current-limiting functions.

The input to ICI-comes from the output of BR1, which is filtered by CI and C2 to about +60 Vdc, and the input for current-sense comparator IC2 comes from BR2, which also acts as a negative bias supply for regulation down to ground.

Universal Laboratory Power Supply Circuit Diagram

Simple Universal Laboratory Power Supply Circuit Diagram

Tuesday, August 26, 2014

Simple Variable Dc Supply Step Wiring diagram Schematic

This is a Simple Variable Dc Supply Step Circuit Diagram. Intended as a replacement for generally poorly regulated `wall-type` ac/dc adapters, this Simple Variable Dc Supply Step Circuit Diagram offers superior performance to simple, unregulated adapters.

Voltages of 3, 6, 9, and 12 V are available. The DPDT switch serves as a polarity-reversal switch. R2 through R6 can be replaced with a 2.5-kfl pot for a variable voltage of 1 to 12 V. R7 through RIO can be replaced by a fixed resistor of about 1 kfi if the LED1 brightness variation with output voltage is not a problem.

Simple Variable Dc Supply Step Circuit Diagram

Monday, August 25, 2014

Versatile and simple power supply

Versatile and simple power supply is one of several series of power supply many other well-known, because making a fairly easy circuit power supply is also nice, versatile addition also can be used on any circuit, for example, Radio tuner, Intregated power amplifier circuit, etc. . But we need to know the Versatile and simple power supply is not used to charge the battery because it will quickly damage the transistors that exist. To have a good output voltage, use of quality components.

Versatile and simple power supply

Part List :
R1 = 1K
C1 = 0.22uF 275V
C2 = 4700uF 50V
C3 = 100n
C4 = 220uF
C5 = 1000uF
Q1 = TIP30
T1 = Step-down Transformer 220V to 12-35V

Symmetric Power Supply Using Transformer

Symmetric Power Supply is the power supply that uses a transformer with dual voltage. In this power supply will generate 3 phase voltage is positive (), negative (-) and CT (0). CT = Center Tap).
A transformer that reads 12V CT 12, meaning that as they pass rectifier (diode) will produce a voltage 12, 0,-12V and 0 (CT) serves as a ground (neutral phase). If there is no writing can be measured using the AVO meter digital with measuring range AC position.

Black probe in the middle and the red probe to look left and right voltage tap on the secondary. If same value between tap the left and right, this is called symmetric transformers.
However transformers can also produce high voltage 24V, that is by connecting the 12V left and right in to rectifier diode without functioning 0 (CT).

Now, Power Supply Symmetric widely used in Power Amplifier., The power of the power amplifier weighs around 20-40kg, as it uses a large ampere transformer and cooling system uses aluminum(HEAT SINK).

In Figure 1, show how to count transformer voltage value 12V &12V.
Place a Black Probe in the center tap; Place a Red probe to left-tap, see scale needle the AVO meter. Next, move red probe to right-tap, see scale needle the AVO meter again. If the same of value then called a symmetric voltage.


Figure 1
Power Supply Circuit - Symmetric Power Supply

And in Figure 2, show how to make a 24V voltage.

further development please try it yourself.


Figure 2 Symmetric Power Supply

In Figure 3, show schematic diagram, how to connect the transformer to the rectifier diode will produce a voltage 12V and-12V.
Electrolit capacitors and capacitor serves to dissipate electric corrugation of the magnetic induction in the transformer or eliminate the hum.

Schematic Diagram
Symmetric Power Supply

Beware, do not touch parts of the primary transformer because it is dangerous.
When do the splicing / soldering unplug the power cord from the outlet of your home.

May be useful.

Sunday, August 24, 2014

Build a Positive And Negative Voltage Switching Supply

Build a Positive And Negative Voltage Switching Supply. An LT1172 generates positive and negative voltages from a 5-V input. The LT1172 is configured as a step-up converter. To generate the negative output, a charge pump is used. C2 is charged by the inductor when D2 is forward-biased and discharges into C4 when LT1172`s power switch pulls the positive side of C2 to ground.

Positive And Negative Voltage Switching Supply Circuit Diagram

Tuesday, August 19, 2014

1 25V to 25V To DC power supply

This is a DC power supply schema.This schema is based on LM317 Variable Regulator.This Regulator needs at least 28v(DC).Then it will out put 1.25v to 25v DC.So I suppose this would be an important schema for you all.

Note

# 5K ohm Change If you want to change the out put voltage
# This schema supplies 1.3A.

High Voltage Pulse Supply Wiring diagram Schematic

This high-voltage pulse supply will generate pulses up to 30 kV. Ql and Q2 form a multivibrator in conjunction with peripheral components Rl through R6 and CI, C2, C3, C5, C6, and D2. R9 adjusts the pulse repetition rate. R2 should be selected to limit the maximum repetition rate to 20 Hz. II is a type 1156 lamp used as a current limiter.

R9 can be left out and R2 selected to produce a fixed rate, if desired. Try about 1 as a start. Q3 serves as a power amplifier and switch to drive Tl (an automotive ignition coil). NE1 is used as a pulse indicator and indicates schema operation. Because this schema can develop up to 30 kV, suitable construction techniques and safety precautions should be observed.

High-Voltage Pulse Supply Circuit Diagram

Sunday, August 17, 2014

Simple 9VDC Power Supply with Zener Diode

Maybe youve seen my article about the 9 Volt Power supply is in the visible scheme using series regulator IC 7809. Many methods to generate DC voltage with 9 Volt DC outputs result. One of them is to use a zener diode. The use of Zener diodes to produce this voltage can not be applied in a large power, while the inputs that go into the zener diode should not be large, it will make it burn, unless you use a large amperage on the zener diode. Provisions to obtain a stable voltage at the input of the zener should use a resistor after the rectifier voltage source. To apply them to big power transistors must be assisted by. Usually zener placed on the transistor base with the help of resistors, can not be directly from the results of the DC voltage source rectifier transformer. Transformer used in this power supply does not exceed the maximum voltage that should be fed to the diode cathode poles, power transformer least around 500mA-1A.

Zener Diode usually consists of two pole polarity, the pin cathode and anode. The cathode is usually a line to black (or red) on the diode body. In a simple scheme below you can see how the reduction or locking of the output voltage after the rectifier into a DC voltage of 9V. Zener diode code to get this voltage is usually labeled name 9.1V. Sometimes the factory writes power and temperature tolerance, the writing is very small. For mounting Diode’s wire do not reversed, it will result in broken or short schema occurs at the output. Cathode should get helped by a positive voltage after the resistor, and then the voltage of 9 volts locking occurs at the confluence of the resistor and the cathode to the negative / common.

In the picture below we see a combination of the use of a zener diode with a transistor to generate a large power output. I prefer to use NPN transistors for this schema. You can use any type NPN transistor origin is related to the characteristics and functions of transistors that we use. Suppose we may use the D313, TIP31 or 2N3055. For this transistor must be given in the form of external cooling heat sink.

How to measure
To get the right size then it is better to use a digital multimeter, but if you do not have this multimeter you can also use a needle multimeter (AVO Meter). The way, the set switch position DC multimeter with 50 scales or approaching, the red wire is placed on the cathode pole of Zener diodes, the black wire to the common. See the needle multimeter will definitely show to position 9 Volt.

Friday, August 15, 2014

1 3V DC to 12 2V DC Regulator Power Supply

Power supply circuit to generate output below were variations between 1.3V DC to 12.2V DC with 1A current.
In addition, the power supply circuit is also equipped with over-current protection or shield against belebih flow. Power supply circuit is very simple, but the quality is quite good, made her basiskan regulator IC LM723 is a pretty legendary.

Description:
R2 to set the output voltage. The maximum current is determined by R3, over-current protection circuit inside the LM723 to detect the voltage on R3, if it reaches 0.65 V, the voltage output will be off her. So the current through R3 can not exceed 0.65 / R3 although output short-circuit in his.

C3 and C4 are ceramic capacitors, as much as possible directly soldered to the PCB, this is because the LM723 is prone to oscillation that is not cool.

LM723 works with 9.5V input voltage to 40 V DC and the LM723 can generate its own current of 150mA when the output voltage is not more than 6-7V under input voltage.

Specifications:
Output (value estimated):

Vmin = (R4 + R5) / (R5 * 1.3)
Vmax = (7.15 / R5) * (R4 + R5)

Imax = 0.65/R3

Max. Power on R3: 0.42/R3

Min. DC Input Voltage (pin 12 to pin 7): Vmax + 5

Component List:
B1 40V/2.5A
C1 2200uF (3300uF even better)
C2 4.7uF
C3 100nF
C4 1NF
C5 330nF
C6 100uF
Green LED D1
D2 1N4003
F1 0.2A F
F2 2A M
IC1 LM723 (in a DIL14 plastic package)
R1 1k
R2 Pot. 5k
R3 0.56R/2W

R4 3.3k
R5 4.7k
S1 250V/1A
T1 2N3055 on a heatsink 5K / W
TR1 220V/17V/1.5

source [link]

Thursday, August 14, 2014

Universal DC Power Supply

I didnt realize till the other day that I have never shown a schema for a standard power supply. Shown below is a supply that will use any of the LM78XX series of voltage regulators. The transformer in the schema will vary depending on which regulator you use. For voltages from 5 to 12 use a transformer with output of 18vac. With voltages from 15 to 24 use a transformer of 30vac. The first capacitor in the schema may need to vary if you are supplying more current to the load. Typically it will be 2000uf for every amp of current.

www.streampowers.blogspot.com