Showing posts with label dc. Show all posts
Showing posts with label dc. Show all posts
Friday, November 14, 2014
5V DC POWER SUPPLY
Wednesday, November 12, 2014
Simple 12V DC to 220V 100W Inverter
This is 100W inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor. Power output is 100W from 2-3A transformer.
Thursday, October 2, 2014
DC High Voltage Protector Circuit Diagram
In case the particular voltage of the mains supply of a computer increases excessive, elements around the printed circuit planks can easily be ruined as well as destroyed.
This kind of unexpected urgent situation cut-out positioned involving the mains supply as well as interrupts the supply if the voltage level exceeds any established value. For a lot of causes its possible for your result voltage of your power supply to increase to some harmful degree. The unexpected urgent situation cut-out described below continues to be arranged towards the highest supply voltage regarding 5.25 V that is explained by the manufacturers associated with TTL ICs.
Zener diode D1 begins doing prior to the particular explained zener voltage is reached. Small current runs in the anode gate circuit of thryristor Th1; the particular level of the current can be arranged with predetermined potentiometer P1 disadvantage connected within side parallel using the door cathode circuit regarding Th1. When the mains supply goes up, the current with the zener diode gets big enough to cause the particular thyristor to fireplace. The actual heating stage lies between 5.2 . . . 6 V. As soon as the thyristor shoots, the principals supply voltage drops substantially because the thyristor practically short-circuits the actual primaries supply. In the case of the supply with out current constraining,merge F1 helps prevent the current will be attaining too high something. The electronic ranking from the blend is dependent, needless to say, about the insert requirement. Throughout screening and also adjusting from the circuit, it is important how the thyristor is constantly on the perform once it has been dismissed till its current provides dropped in order to be able for you to help absolutely no. The particular heating voltage degree may be established by means of a mains supply with a current clipper before it is placed into use.low frequency this shows difficult, because of the tolerances from the zener rectifying tube, to set the shooting voltage for the needed worth, use a 5.1V zener rectifying diode.
This kind of unexpected urgent situation cut-out positioned involving the mains supply as well as interrupts the supply if the voltage level exceeds any established value. For a lot of causes its possible for your result voltage of your power supply to increase to some harmful degree. The unexpected urgent situation cut-out described below continues to be arranged towards the highest supply voltage regarding 5.25 V that is explained by the manufacturers associated with TTL ICs.
Zener diode D1 begins doing prior to the particular explained zener voltage is reached. Small current runs in the anode gate circuit of thryristor Th1; the particular level of the current can be arranged with predetermined potentiometer P1 disadvantage connected within side parallel using the door cathode circuit regarding Th1. When the mains supply goes up, the current with the zener diode gets big enough to cause the particular thyristor to fireplace. The actual heating stage lies between 5.2 . . . 6 V. As soon as the thyristor shoots, the principals supply voltage drops substantially because the thyristor practically short-circuits the actual primaries supply. In the case of the supply with out current constraining,merge F1 helps prevent the current will be attaining too high something. The electronic ranking from the blend is dependent, needless to say, about the insert requirement. Throughout screening and also adjusting from the circuit, it is important how the thyristor is constantly on the perform once it has been dismissed till its current provides dropped in order to be able for you to help absolutely no. The particular heating voltage degree may be established by means of a mains supply with a current clipper before it is placed into use.low frequency this shows difficult, because of the tolerances from the zener rectifying tube, to set the shooting voltage for the needed worth, use a 5.1V zener rectifying diode.
Friday, September 19, 2014
LM317 Variable DC Power Supply
LM317-Variable DC Power Supply Circuit diagram : ![]()
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This power supply is based on the LM317 Variable Regulator. The input of the regulator needs to be around 28 Volts DC and it will output a DC voltage from 1.25vdc to 25 vdc. To adjust the output voltage simply turn the 5k ohm pot. The regulator will supply 1.5 amps of current.
Thursday, August 21, 2014
Variable DC Power Supply Rise
This project provides the schematic & the parts list needed to construct a simple DC Power Supply from an input power supply of 7-20 V AC or 7-30V DC. This project will come in handy in case you use plenty of batteries for your basic electronics project.
Two DC voltage outputs are available; is a fixed regulated 5V for TTL use. The other output is variable from 5V upwards. The maximum output voltage depends on the input voltage. The specified maximum input DC voltage to the regulator is 35V. The maximum input voltage must be two volts higher than the regulated output voltage.
The DC Power Supply schema is based around the 7805 voltage regulator. Its only three connections input, output & ground & it provides a fixed output. The last digits of the part number specify the output voltage, e g. 05, 06, 08, ten, 12,15, 18, or 24. The 7800 series provides up to one amp load current & has on-chip schemary to close down the regulator if any attempt is made to operate it outside its safe operating area.It can be seen that theres in fact separate diagram in this power supply. 7805 is directly connected as a fixed 5V regulator. The second 7805 has a resistor divider network on the output. A variable 500 ohm potentiometer is used to vary the output voltage from a maximum of 5V up to the maximum DC voltage depending on the input voltage. It will be about 2V below the input DC voltage.
The capacitor across the output improves transient response. The giant capacitor across the input is a filter capacitor to help smooth out ripple in the rectified AC voltage. The larger the filter capacitor the lower the ripple.
For tiny applications the heat sinks wont be needed. The tab on the regulator will dissipate 2W at 25 o C in air. (This is equivalent, for example, to an input voltage of 9V, an output of 5V & drawing 500 m A.) However, as your projects get bigger they will draw more current from the power supply and the regulators will operate at a higher temperature and a heat sink will be needed. You can basically add voltage & current meters to it and put it in to an appropriate plastic case connected to a transformer.
Trouble Shooting Procedure
An LED has been put in to the output of the fixed 5V regulator to indicate that the schema is working. Poor soldering is the most likely reason that the schema does not work. Check that all the soldering is done properly. Check that all parts are in their correct position on the PCB. Other items to check are to make sure that the regulators, electrolytic capacitor & bridge rectifier are inserted in the correct orientation.
An LED has been put in to the output of the fixed 5V regulator to indicate that the schema is working. Poor soldering is the most likely reason that the schema does not work. Check that all the soldering is done properly. Check that all parts are in their correct position on the PCB. Other items to check are to make sure that the regulators, electrolytic capacitor & bridge rectifier are inserted in the correct orientation.
Wednesday, August 20, 2014
Build a Variable 5 to 20V DC Supply Wiring diagram Schematic
This is a Variable 5 to 20V DC Supply Circuit Diagram. If you are looking for a low drop voltage regulator that can provide a power supply of 1A with an output voltage of between 5V and 20V DC, National Semiconductor LM2941 Low Dropout Adjustable Regulator is that you can pick to make use of. Its a typical dropout voltage of 0.5V which means that the input supply need only must be 0.5V DC over the desired output voltage.
Variable 5 to 20V DC Supply Circuit Diagram
Its other features include internal short schema current limit and reverse battery protection. As shown in the schematic below, the regulator has five pins which consists of the ON/OFF control, Input Voltage, Output Voltage, Ground & Adjustable pins. ON/OFF is used for the purpose of switching on & off of the regulator. The capacitors C1 & E1 are to be placed as close as feasible to the regulator.
The output of the schema can be varied by varying the worth of potentiometer VR1 from 5V DC to 20V DC. The input voltage is limited from five.5V DC to 30V DC. Resistor R1 must be greater than 1K. The worth of the VR1 that needs to be set is calculated from the formula given below:
VR1 = R1[(Vout/1.275) - 1] ohm
If R1=1K, Vout = 5V, VR1 should be set to 2.9K ohm.
If R1=1K, Vout = 20V, VR1 should be set to 14.7K ohm
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