Showing posts with label dc. Show all posts
Showing posts with label dc. 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.
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.
Tuesday, November 4, 2014
Small DC Motor Control Using PWM
Small DC motors are efficiently controlled using pulse-width modulation (PWM) method. The circuit described here is built around an LM324 low-power quad-operational amplifier. Of the four op-amps (operational amplifiers) available in this IC, two are used for triangular wave generator and one for comparator. Op-amp N2 generates a 1.6kHz square wave, while op-amp N1 is configured as an integrator. The square wave output of N2 at its pin 14 is fed to the inverting input (pin 2) of N1 through resistor R1. As N1 is configured as an integrator, it outputs a triangular wave of the same frequency as the square wave. The triangular wave is fed to pin 5 of op-amp N3, which is configured as a comparator.
Small DC Motor Control Circuit Diagram :
The reference voltage at pin 6 of the comparator is fixed through the potential divider arrangement formed by potmeter VR1 and resistors R4 and R5. It can be set from –6V (lowermost position of VR1) to +6V (uppermost position of VR1).
The triangular wave applied at pin 5 of N3 is compared with the reference voltage at its pin 6. The output at pin 7 is about +12V when the voltage at pin 5 is greater than the voltage at pin 6. Similarly, the output at pin 7 is about -12V when the voltage at pin 5 is lower than the voltage at pin 6.
The output from comparator N3 is the gate voltage for n-channel MOSFET (T1). T1 switches on when the gate voltage is positive and switches off when the gate voltage is negative. Setting of the reference voltage therefore controls the pulse-width of the motor. When T1 is switched on for a longer period, the pulse width will be wider, which means more average DC component and faster speed of the motor. Speed will be low when the pulse width is small. Thus potmeter VR1 controls the speed of the motor.
Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. The circuit requires ±12V power supply for its working. It can also be modified to control the speed of a 6V or 24V DC motor.
Sunday, October 5, 2014
Step Up Input Voltage DC DC Converter
This circuit uses bog standard parts, without requiring a magical "do-it-all" IC. You can make an ultra simple 1.5v to 9v regulated stepup converter by using a TL496 IC, a coil and a capacitor, but thats not so much fun if you want to experiment. Ive already built a TL496 based circuit so I started doing web searches for something that I could make that would allow more fiddling and a wider range of applications.
Monday, September 8, 2014
DC Converter DC 12V to 24V Wiring diagram Schematic
DC Converter - DC 12V to 24V Circuit Diagram. A voltage converter is very useful, if it raises the voltage from 12v to 24v. Can be used to power low power equipment and even a battery charger Notebook. It works with a two-transistor oscillator, type astable which drives a power transistor controlled by a Zener diode. Thus is achieved with a good efficiency and stabilize the output voltage of 24V.
The coil should be wound on a ferrite core in the form of 1 cm and consists of 100 turns of wire of 1 mm section.
The coil should be wound on a ferrite core in the form of 1 cm and consists of 100 turns of wire of 1 mm section.
DC Converter - DC 12V to 24V Circuit Diagram
Friday, September 5, 2014
5W 5W AMPLIFIER WITH DC VOLUME CONTROL TDA7496
Circuit Diagram:
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| 5W+5W AMPLIFIER WITH DC VOLUME CONTROL |
Tuesday, September 2, 2014
DC motor driver with H Bridge IC L293D
Making a DC motor driver with H-Bridge technique can use IC L293D as in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)"is. DC motor driver L293D can be used to control the DC motor 2 pieces at once. DC Motor Driver L293D can be used to control a DC motor continuously or with a PWM technique. Dc motor driver circuit in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)" only use IC L293D only. For more details see the following figure.
Working system of DC motor driver L293D is to provide control signals in the form of logic or pulse to the input lines 1A - 1B for DC motor control M1 and the input 2A - 2B for the control of DC motor M2 with the following conditions:
Input A Input B Motor DC0 0 Motor silent
1 0 motor rotates counterclockwise
0 1 Motor berputer clockwise
1 1 Motor silent
Description: Enable Input given a logic 1 to obtain such data in the table above.
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
Thursday, August 21, 2014
3000 watt power inverter 12V DC to 230V AC
3000 watt power inverter 12V DC to 230V AC
| Circuit Diagram of 3000 watt power inverter 12V DC to 230V AC |
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| Fig. 2: Sine-wave voltage and conventional square wave voltage with both 230 Volt rms |
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| Fig. 3: Square wave voltage with duty cycle 25% for 230 Volt rms ("modified sine") |
PCB Layout:3000 watt power inverter 12V DC to 230V AC
Component Placement: 3000 watt power inverter 12V DC to 230V AC
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| fig.: output voltage with no load or inductive load. |
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| fig.: resistor 0,001 Ohm made of high-grade steel sheet metal |
Control electronics | 3000 watt power inverter 12V DC to 230V AC
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| fig.: control electronics on strip hole plate (previous version) and PCB of the "professional edition" |
Assembly of the mosfet-transistors on the heat sink | 3000 watt power inverter 12V DC to 230V AC
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| fig.: heat sink, mosfet transistors, connections. |
Final assembly | 3000 watt power inverter 12V DC to 230V AC
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| fig.: 1500 VA inverter with 2 parallel transformers and 1000 VA inverter |
Source:http://www.qsl.net
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.
1000 Volt DC to DC Regulator Circuit
Input voltage high voltage DC-DC converter 12V AC to 800 mA of current and then converted to DC through a rectifier diode 1A. The output voltage converter circuit can be adjusted in the range 0-1000V DC. This high voltage DC-DC converter uses the transformer as a base and several other active components include 555 timer IC, CMOS IC 4001, IC voltage regulator 7805, some NPN transistors and a pair of IRF510 MOSFET logic as a final amplifier.
The operation of the DC high voltage dc is the same principle as written in previous articles. The difference shown is this scheme is a converter output voltage high and can be arranged.
If a particular transformer mentioned in the scheme is not available, each AC transformer with 117V primary specification, 63V AC CT secondary to work. In this case, operating the converter circuit in a transformer sweet spot, you may need to select a frequency of unity.
The operation of the DC high voltage dc is the same principle as written in previous articles. The difference shown is this scheme is a converter output voltage high and can be arranged.
If a particular transformer mentioned in the scheme is not available, each AC transformer with 117V primary specification, 63V AC CT secondary to work. In this case, operating the converter circuit in a transformer sweet spot, you may need to select a frequency of unity.
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.
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.
Simple Micro Inverter circuit DC voltage AC 12v x110v
This is a micro-inverter DC voltage to AC from a 12v battery can generate a voltage of 110 or 220 volts AC and a frequency of 50Hz to 60Hz. The schema is very simple and does not need a printed schema board, It is composed of two transistors oscillators that generate the square wave pulse to the transformer in the case is 10 +10 and its output 220V or 110V. This schema is 50Hz, but can be changed by changing the value of RC .
Micro Inverter schema DC voltage AC 12v x110v Circuit Diagram
This schema has the power transistor and that depends on the transformer.
Simple Ac To Dc Converter Wiring diagram Schematic
This is simple Ac To Dc converter schema diagram. By coupling two back-to-back diodes in series with an ac power schema, a voltage of about 1.4 Vpp can be obtained. This voltage is useful for exciting the primary coil of a small transformer. The voltage induced in the secondary coil can then be rectified and used to power solid-state control diagram. The forward-voltage drop of the diodes is inherently constant and stable over a wide range of ac-schema power variations.
The resulting voltage developed across the transformer windings is also free from variation that might be caused by changes in the schema`s current or voltage. In the schema, a lamp (LMP-1) is connected to the primary ac input line (Ll and L2) through a pair of inverse-parallel-connected power diodes (Dl and D2). As power flows to the lamp, a drop of about 0.7 V is alternatively developed across each of the diodes.
This voltage feeds the primary of a small transformer (Tl). T1 can be a small 8- to 500- transistor radio output, etc. This will deliver about 11 Vpp across its secondary winding. LMP1 can be a small 120-V lamp of 5 to 25 W, etc.
Ac To Dc Converter Circuit Diagram
Simple Ac To Dc Converter Circuit Diagram
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