Showing posts with label supply. Show all posts
Showing posts with label supply. Show all posts
Friday, November 7, 2014
L200 Variable Power Supply
The circuit was designed for a power supply that can be adjusted or altered depending on the pre-set value by using a L200 volatge and current regulator.
![]( "L200")
Designing a power supply with a flexible 5-pin L200 voltage regulator makes it self-sufficient for the limits in voltage and current. It has an adjustable output current up to 2 Amp, adjustable output voltage down to 2.85 Volts, input overvoltage protection, short circuit protection, output transistor protection, thermal overload protection, low standby current drain and low bias current on regulation pin.The L200 can be used to substitute fixed voltage regulators and reduces the need to store a range of fixed voltage regulators.
The primary rating of the winding of the transformer depends on the input source but the secondary rating must generate 12 Volts running 2 Amp. Controlling the current is limited by the 47-ohm resistor while the voltage output is regulated by the 10K-ohm resistor. The circuit will produce zero voltage output if the current will go beyond the limit.
For safety purposes, all connections in the transformer should be properly insulated especially when dealing with the mains input. A plastic bobbin with 2 chambers should be used for the primary and secondary coils. No transformer is totally safe, but keeping in mind the safety ways in handling live circuits can prevent such harm.
Source:www.zen22142.zen.co.uk/Circuits/Power/l200var.html
Read More..
Designing a power supply with a flexible 5-pin L200 voltage regulator makes it self-sufficient for the limits in voltage and current. It has an adjustable output current up to 2 Amp, adjustable output voltage down to 2.85 Volts, input overvoltage protection, short circuit protection, output transistor protection, thermal overload protection, low standby current drain and low bias current on regulation pin.The L200 can be used to substitute fixed voltage regulators and reduces the need to store a range of fixed voltage regulators.
The primary rating of the winding of the transformer depends on the input source but the secondary rating must generate 12 Volts running 2 Amp. Controlling the current is limited by the 47-ohm resistor while the voltage output is regulated by the 10K-ohm resistor. The circuit will produce zero voltage output if the current will go beyond the limit.
For safety purposes, all connections in the transformer should be properly insulated especially when dealing with the mains input. A plastic bobbin with 2 chambers should be used for the primary and secondary coils. No transformer is totally safe, but keeping in mind the safety ways in handling live circuits can prevent such harm.
Source:www.zen22142.zen.co.uk/Circuits/Power/l200var.html
Friday, October 17, 2014
2N3055 and LM723 Power Supply 13 8Volt 10Amp circuit
My Friend want circuit power supply for VR.
I Find Website many, See to this Web http://www.rason.org
Good Site circuit.
This is circuit Power Supply 13.8 Volt 10 Amp by LM723 .
Detail ::
This circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply.
I Find Website many, See to this Web http://www.rason.org
Good Site circuit.
This is circuit Power Supply 13.8 Volt 10 Amp by LM723 .
Detail ::
This circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply.
Sunday, October 12, 2014
Power Supply 5V 1 3 3A by LM2575
Read More Source:
http://www.mct.net/product/power1.html
Friday, October 10, 2014
FAN302HL bassed 5 volt switching power supply circuit project
A very simple 5 volt switching power supply electronic circuit project can be designed using FAN302HL highly integrated PWM controller integrated circuit, that provides several features to enhance the performance of general flyback converters.
The constant-current control, of the FAN302HL proprietary topology enables simplified circuit designs without secondary feedback circuitry for battery charger applications.
This 5 volt switching power supply electronic circuit project accepts a wide range input voltage from 90 to 265 VAC and will provide a 5 volt regulated output at a maximum output current of 1.2 ampere .
A proprietary Burst-Mode function with low operation current minimizes standby power consumption.
The FAN302HL controller also provides several like protections : VDD Over-Voltage Protection (Auto-Restart) ,VS Over-Voltage Protection (Latch Mode) , Fixed Over-Temperature Protection .
The most difficult part that is require in this project is the transformer.
W1 is four winds; for each wind of turns, refer to table bellow. Add one insulating tape between the first and second layers.
W2 is wound two layers and uses triple-insulated wire: end of positive fly line is 3.5cm, layer end of negative fly line is 2.5cm.
W3 is spares winding in one layer.
W4 is wound in the core of the outermost layer and sparse winding.
Thursday, October 9, 2014
latest circuit and explanation of Basic UPS Power Supply
Circuit : Andy Collinson
Email: anc@mitedu.freeserve.co.uk
Description
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.
![UPS]()
Notes:
This circuit can be adapted for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply use two 12 Volt batteries in series and a 7815 regulator. There is a lot of flexibility in this circuit.
TR1 has a primary matched to the local electrical supply which is 240 Volts in the UK. The secondary winding should be rated at least 12 Volts at 2 amp, but can be higher, for example 15 Volts. FS1 is a slow blow type and protects against short circuits on the output, or indeed a faulty cell in a rechargeable battery. LED 1 will light ONLY when the electricity supply is present, with a power failure the LED will go out and output voltage is maintained by the battery. The circuit below simulates a working circuit with mains power applied:
![mains]()
Between terminals VP1 and VP3 the nominal unregulated supply is available and a 5 Volt regulated supply between VP1 and VP2. Resistor R1 and D1 are the charging path for battery B1. D1 and D3 prevent LED1 being illuminated under power fail conditions. The battery is designed to be trickle charged, charging current defined as :-
D2 must be included in the circuit, without D2 the battery would charge from the full supply voltage without current limit, which would cause damage and overheating of some rechargeable batteries. An electrical power outage is simulated below:
![power]()
Note that in all cases the 5 Volt regulated supply is maintained constantly, whilst the unregulated supply will vary a few volts.
Standby Capacity
The ability to maintain the regulated supply with no electrical supply depends on the load taken from the UPS and also the Ampere hour capacity of the battery. If you were using a 7A/h 12 Volt battery and load from the 5 Volt regulator was 0.5 Amp (and no load from the unregulated supply) then the regulated supply would be maintained for around 14 hours. Greater A/h capacity batteries would provide a longer standby time, and vice versa.
Read More..
Email: anc@mitedu.freeserve.co.uk
Description
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.
Notes:
This circuit can be adapted for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply use two 12 Volt batteries in series and a 7815 regulator. There is a lot of flexibility in this circuit.
TR1 has a primary matched to the local electrical supply which is 240 Volts in the UK. The secondary winding should be rated at least 12 Volts at 2 amp, but can be higher, for example 15 Volts. FS1 is a slow blow type and protects against short circuits on the output, or indeed a faulty cell in a rechargeable battery. LED 1 will light ONLY when the electricity supply is present, with a power failure the LED will go out and output voltage is maintained by the battery. The circuit below simulates a working circuit with mains power applied:
Between terminals VP1 and VP3 the nominal unregulated supply is available and a 5 Volt regulated supply between VP1 and VP2. Resistor R1 and D1 are the charging path for battery B1. D1 and D3 prevent LED1 being illuminated under power fail conditions. The battery is designed to be trickle charged, charging current defined as :-
(VP5 - 0.6 ) / R1
where VP5 is the unregulated DC power supply voltage.
where VP5 is the unregulated DC power supply voltage.
D2 must be included in the circuit, without D2 the battery would charge from the full supply voltage without current limit, which would cause damage and overheating of some rechargeable batteries. An electrical power outage is simulated below:
Note that in all cases the 5 Volt regulated supply is maintained constantly, whilst the unregulated supply will vary a few volts.
Standby Capacity
The ability to maintain the regulated supply with no electrical supply depends on the load taken from the UPS and also the Ampere hour capacity of the battery. If you were using a 7A/h 12 Volt battery and load from the 5 Volt regulator was 0.5 Amp (and no load from the unregulated supply) then the regulated supply would be maintained for around 14 hours. Greater A/h capacity batteries would provide a longer standby time, and vice versa.
Sunday, October 5, 2014
2N3055 TIP41 CA3140 Lab Power Supply 0 30V 2A
This is the schematic of the 30V/2A power supply I use in my own lab.It may look very complex, but it really isn’t very difficult to understand: it uses only the knowledge we’ve learned in the previous lessons.
The top part looks like the power supply we built in Lesson 7: the transformer L1 transforms the outlet voltage to a safe 30V, which is rectified by bridge rectifier G2 and smoothed by capacitor C5. Transistors T3 and T6 form a darlington transistor. This darlington replaces transistor T1 in Lesson 7. However, the base voltage is not controlled by a simple potmeter, but by an ‘electronic potmeter’ with voltage feedback. The advantage of this feedback is a load-independent output voltage.
Tuesday, September 16, 2014
Regulator power supply with op amp
Power supply circuit has a first amplifier using op-amp is IC uA741. Op amp circuit that is used only one, but it also features an adjustable voltage, which is steered by a trimpot resistors. Rtrim will set the input to the IC input on pin 2, so that if the detainee on Rtrim which will be channeled into ic enlarges the output voltage will be small, and otherwise. After the voltage is boosted and filtered and then the voltage will be regulated and boosted again by a NPN transistor.
| Output voltage 0.5V - 35V |
Resistor
R1____1K5
R2____1K trim
R3____10K
R4____330R
R5____1K
R6____47R
R7____68R
R8____820R
R9____47K
R10___22K
R11___1K5
Capacitor
C1____10000uF 80V
Transistor
Q1____2N3565
Q2____2N3565
Q3____S9013
Q4____S9013
Diode
D1____1N4007
D2____1N4007
LED1_Red Led
IC
U1____uA741 (op-amp ic)
Monday, September 8, 2014
Simple Microprocessor power supply watchdog circuit Wiring diagram
The Simple Microprocessor power supply watchdog schema Diagram monitors the input to the microprocessor 5 V regulated supply for voltage drops and initiates a reset sequence before supply regulation is lost. In operation, the resistor capacitor combination Rs and Cj form a short time constant smoothing network for the output of the fullwave bridge rectifier.
An approximately triangular, voltage waveform appears across C and Rs and it is the minimum excursion of this that initiates the reset. Diode Dg prevents charge sharing between capacitors Cj and Ck. Resistors Rn and Rm form a feedback network around the voltage reference section of the LM10C, setting a threshold voltage of 3.4 volts.
Microprocessor power supply watchdog schema Diagram
The threshold voltage is set at 90% of the minimum voltage of the triangular waveform. When the triangular wave trough, at the comparators non-inverting input, dips below the threshold, the comparator output is driven low. This presents a reset to the microprocessor. Capacitor Ch is charged slowly through resistor Rk and discharged rapidly through diode De.
Constant LED Power Supply Wiring diagram Schematic
An LED is usually a series resistor needed to ensure that the LED does not get too much power. The disadvantage of such a resistor is that the current thus also changes by the LED and the brightness as the voltage changes.
This schema prevents that, by independent of the voltage, a constant current through the LED.The schema uses two transistors and two resistors. The schema can be connected to voltages of from 5 to 24 V.
Constant LED Power Supply Circuit Diagram
Saturday, September 6, 2014
Transformerless 5 Volt DC Power Supply
An increasing number of appliances draw a very small current from the power supply. If you need to design a mains-powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance’s total power consumption is very small? Transformer-based power supplies are bulky, while the switchers are generally made to provide greater current output, with a significant increase in complexity, problems involving PCB layout and, inherently, reduced reliability.
Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant heat dissipation would occur even for such a small power consumption.
Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant heat dissipation would occur even for such a small power consumption.
Transformerless 5 Volt DC Power Supply
At 100mA, the useless dissipation would go over 30 W, making this scheme completely unacceptable. Power conversion efficiency is not a major consideration here; instead, the basic problem is how to reduce heavy dissipation and protect the components from burning out. The schema shown here is one of the simplest ways to achieve the above goals in practice. A JVR varistor is used for over-voltage/surge protection. Voltage divider R1-R2 follows the rectified 230 V and, when it is high enough, T1 turns on and T3 cannot conduct.
When the rectified voltage drops, T1 turns off and T3 starts to conduct current into the reservoir capacitor C1. The interception point (the moment when T1 turns off) is set by P1 (usually set to about 3k3), which controls the total output current capacity of the power supply: reducing P1 makes T1 react later, stopping T3 later, so more current is supplied, but with increased heat dissipation. Components T2, R3 and C2 form a typical ‘soft start’ schema to reduce current spikes — this is necessary in order to limit C1’s charging current when the power supply is initially turned on. At a given setting of P1, the output current through R5 is constant.
Thus, load R4 takes as much current as it requires, while the rest goes through a zener diode, D5. Knowing the maximum current drawn by the load allows adjusting P1 to such a value as to provide a total current through R5 just 5 to 6mA over the maximum required by the load. In this way, unnecessary dissipation is much reduced, with zener stabilization function preserved. Zener diode D5 also protects C1 from over voltages, thus enabling te use of low-cost 16 V electrolytics. The current flow through R5 and D5, even when the load is disconnected, prevents T3’s gate-source voltage from rising too much and causing damage to device. In addition, T1 need not be a high-voltage transistor, but its current gain should exceed 120 (e.g. BC546B, or even BC547C can be used).
When the rectified voltage drops, T1 turns off and T3 starts to conduct current into the reservoir capacitor C1. The interception point (the moment when T1 turns off) is set by P1 (usually set to about 3k3), which controls the total output current capacity of the power supply: reducing P1 makes T1 react later, stopping T3 later, so more current is supplied, but with increased heat dissipation. Components T2, R3 and C2 form a typical ‘soft start’ schema to reduce current spikes — this is necessary in order to limit C1’s charging current when the power supply is initially turned on. At a given setting of P1, the output current through R5 is constant.
Thus, load R4 takes as much current as it requires, while the rest goes through a zener diode, D5. Knowing the maximum current drawn by the load allows adjusting P1 to such a value as to provide a total current through R5 just 5 to 6mA over the maximum required by the load. In this way, unnecessary dissipation is much reduced, with zener stabilization function preserved. Zener diode D5 also protects C1 from over voltages, thus enabling te use of low-cost 16 V electrolytics. The current flow through R5 and D5, even when the load is disconnected, prevents T3’s gate-source voltage from rising too much and causing damage to device. In addition, T1 need not be a high-voltage transistor, but its current gain should exceed 120 (e.g. BC546B, or even BC547C can be used).
Friday, September 5, 2014
Low Ripple Regulated Power Supply Wiring diagram Schematic
This schema may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary ).
Low Ripple Regulated Power Supply Circuit Diagram
PARTS LIST | |
| R1 | 2.2KΩ 1W |
| R2 | 56Ω 1W |
| R3 | 1oKΩ 1W |
| C1 | 1000µF 63V |
| C2 | 100µF 50V |
| C3 | 470µF 50V |
| D1, D2, D3, D4 | 6A Bridge Rectifier |
| D5 | 500mA Zener Diode (see description) |
| Q1 | 2N3055 |
| Q2 | 2N3054 |
Q1, Q2, and R2 may be regarded as a power darlington transistor. D5 and R1 provide a reference voltage at the base of Q1. D5 should be chosen thus:
D5=Vout-1.2
D5=Vout-1.2
C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100µF is chosen for C2, assuming minimum hef for Q1 and Q2,
C=100×15(Q1)×25(Q2)
=37000µF.
Sunday, August 31, 2014
Build a Isolated 15V To 2500V Power Supply Wiring diagram Schematic
Build a Isolated 15V To 2500V Power Supply Circuit Diagram. A dc-dc converter using a 74HC04 drives Tl. Tl is a ferrite-core transformer using a Fair-Rite, Inc. P/N 5975000201 (uo + 5000) and has a 7-turn primary and a 25-turn secondary. Kynar, #30 wirewrap wire is used. With Tl, the schema isolation is good to 2500 V.
Isolated 15V To 2500V Power Supply Circuit Diagram
![Isolated]()
Wednesday, August 27, 2014
9 Volt Power Supply Wiring diagram Schematic Using IC 7809
Description
Circuit showing a 9 volt power supply . Here we have used a bridge rectifier and 7809 ic for making this schema.Where the ic regulate the output to 9 v,1 A .This voltage every time constant.Are you interested ?
Circuit diagram with Parts list.
Notes.
- If a current of 300 mA or above is required, fit a proper heat sink to the IC 7809.
- If 1A bridge is not available, make one using four 1N 4007 diodes.
Thursday, August 14, 2014
Simple Power supply without transformer
Tuesday, August 12, 2014
DC Power Supply Circuit
This is a power supply schema.This schema converts AC 230V to DC 16V.So this is so useful schema for you.Use quality parts for this specially Condensers.As the transformer use 12V transformer.
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