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Hello All, I am trying to drive triac with Positive power supply. With positive power supply it should be possible to drive triac in Q1 and Q4. Here is the circuit I am using. But triac is not triggering. I have checked in oscilloscope the signal on gate looks (...)
Anytime i want to build some power supply i have to have a there any solution to build some power supply without using a transformer?I was thinking about an pwm regulated power supply which uses triac(s) and the current coming right from the main source ( 230 V 50Hz).Does (...)
how i can on the ATX power supply for my micro-controller board . in my universal rf remote controller board , after switch on the CFL1-4 , microcontroller restart . cfl drivers with opto triac , isolated relay , but still there is problem . board try with cd ,dvd player power supply , tran
no... if we want to design a power supply that can produce variable ac voltage, can we use regulator? i guess it was totally a different circuit.. maybe need to use thyristor.. i really need help on that.. designing a variable 0-30 AC voltage supply.. anything similar can also help.. basically it about to design a variable voltag
Hi! I'm working on designing a touch button using pico power AVR microcontroller. upon detecting a touch, the system should activate an AC appliance. For that i will use a triac. The whole circuit should consume no more than 1 mA at 2V. Now I'm searching for the best way to power this circuit from the AC mains without using a bulky (...)
I design power supply for electric fence. Primari voltage 230V AC 1 Secondary +5V <100mA for control electronics 2 Secondary +400V for charging 70uF capacitor, capacitor must be recharged in less 1s Other conditions and pitfalls Control electronics must be able to source block for time <1ms, ie after the time when the capacitor discharges
If you can specify the resistance or impedance of your heat electrode, then you can determine what voltage you need to apply to dissipate 1.5kW. Most likely you can use triac control AC or cycle count burst control using a ZCS triac with suitable driver.
Hi, I'm looking for a project or information about a switching power supply with these caracteristics: - Input : 110-260 Vac - Output : 48 Vdc 18 A with PFC. Thank you
hi there, I'm lookin for a project of a modified PC AT switching power supply so that its modified voltage (0 - 30V) is made variable. Any help is welcome! regards, 2000
I am planning to build a microcontroller power supply. Should be symmetrical, 0-30V and adjustable current limit.. both voltage and current limit controlled via D/A converters. Anyone out here who already did something like this, or has some suggestions ? ***************************************** Please don't reply unless you have useful info
Has anyone seen any designs of a switch mode power supply with a PIC or possibly another MCU as long as it has 3 PWM outputs like the 17C756?
is there any easy way to create a high voltage supply (~1Kv) from a lower voltage standard bench supply?
Hello, can anyone please try to explain me what's the diference between VCT, VA ,VAC, WATT in a power supply? I would apreciate a lot an answer or a link to page for explanations:) Marmes:)
I need to know how can i digital abjust the Vout of a power supply basted on voltage regulators like LM317.Any Shematics? THNX
where can I download "Switch-Mode power supply SPICE Simulation Cookbook" I need it for smps design who can help ? thank you
Hi, Here is a simple power supply I made. It has full zero, "yes zero" 8) voltage contorl to 30V and current down to 5 mA and upto 2A. It has very low noise and good stability. I use it for everthing and it never let me down for past 1 years. Use large Heatsink. Enjoy. :D Hadihf
Hi I need to design some power supply with this characteristics: Vin: 60-70V Vout: Adj (3.3v..5v..10v) Iout: 100..150 ma Ignd: really low (as low as posible). I have only 100 mW for all the circuit, and I need a power suppy with very very low Ignd (very power loss) tia! regards
Hello I would like to design a power supply for a wireless transmiter (4W max output power with Vin=12V). I don´t know much about power supplies and I would like to design a reliable and more or less small one. I would appreciate any sch. or link. thanks a lot anyway, mimoto
Hi, Could someone please explain for me when or why to use switched power supply? Is it cheaper compare to traditionally power supply? Or does it take small place on pcb board? Is there any tum rules when to use switched power supply? Thanks in advance! Best Regards, ltg
I have a lot of experience to repair a power switching: some time the problem, coul be a resistor about 220 330K that change value or power triac or transitor in short. another thing could be a photocoupler for protection or some elettrolitic condencer in lost. check the bridge rectifier too.. I hope my help is good for You. bye..
Hi I need a laboratory power supply sch,I like that it be digital (meters,adj) ,
dear friends, i am going to design a HV power supply with following specs: Vo=6000V Io=1mA load regulation=5% Vi=12V i am familiar with switching power supply design,but until now it is my first experience in HV power supplies. i think flyback topology and UC384x is the best solution; my problem is (...)
I need to build a switch mode power circuit requires +-33V 3A power.Can somebody advice me a schematic for me? I dont want to use big, heavy transformators.I'll place it in a small box (of course if it is possible).Thank you. Analyzer
I am about to build a switcing power supply from 220VAC to 13.8Volts 35-40Amps. Any suggestions for the switcing IC for so big currents? regards
Hi! Somebody can helps me? I'm trying to design subj without transformer (low cost). The AD7752 (this power supply for it) "eats" 17mA+5mA for LED and Counting Mechanism = ~25-30mA. My current powersupply uses all 3 phases but if i disconnect 2 phases the device works pnly half of the period (50Hz). I need scheme (...)
hi, Transformerless power supply.
+30V power supply, how to? tips and schematix
Hi, I am looking for PC ATX power supply schematics (for example, ATX 200W or ATX 400W), would anybody help me? Thanks in advance, ywyw
I have to make 12V ~ 10A power supply, but I have no idea how to do that. Any idea are welcome. thanks
I found that it's possible to use this component design for RS232 transmission as a small power supply system. You apply +5v and get +/- 10V output. I can't find how much can be the output current from this supply. Thanks in advance
A 13.8-V, 40-A Switching power supply.pdf
200W ATX PC power supply
Transformerless power supply
Hi I want to turn on and Off a ATX power supply but without pc(standalone) please give your solutions. bye
How do you care about sequencing power supply voltages? Just recently I have encountered a problem with a DAC chip powered by three different voltages (+/- 15 and +5).
Hi, ALL, I am looking for a power supply with the following parameters: V_in 220VAC V_out 24VDC/5Amax Isolation voltage 50000V Any suggestions? (companies, schematics etc) Thanks in advance.
Hi, I got a old IBM AT power supply without main switch. It starts from motherboard. Now I want use this as my hobby power supply, becauce there are 5.0V, 12V, 3.0V. But I don't know how to put it on. The model is: DPS-200PB-70 E Rev:00. Do some of you know how to put it in on mode? Thanks a lot! Best Regards, ltg
hi all, i need to design this programmable power supply(AC to DC) using PIC16F877 to source high current. The current control is to be through a matrix keyboard(either a numeric keypad or up/down keys) interfaced to the PIC. Also a LCD interfaced with the PIC to display the voltage & current. the specs are 230v 50hz input +-20% single phase. ou
hi all, i need to design a power supply for sourcing high current. the supply should be current controllable through a matrix keyboard interfaced to the PIC i.e. the supply should be capable of sourcing any current entered through the keyboard. An LCD interfaced to PIC should display the voltage, current & other options. (...)
hi all, i need to design a power supply for sourcing high current. the supply should be current controllable through a matrix keyboard interfaced to the PIC i.e. the supply should be capable of sourcing any current entered through the keyboard. An LCD interfaced to PIC should display the voltage, current & other options. (...)
Does anyone have drawings for a solar panel power supply? I'm looking for a PSU that implements Maximum-power-Point-Tracking (MPPT). I want to charge lead-acid cells. /Froggy
Hi, I need to build an electronic power supply load for testing purpose. Any information, link or diagram is welcome. Thanks, hc :wink:
I need schemas from power supply HVDC, for electrostatic precipitator
Hi, does anyone where I can get information for designing and building a cheap digital power supply controlled by a 16f84? Thanks in advance
I need to schemas or designs of electrostatic paint power supply .
Hi someone does it have the elettric schematic of the PC power supply ATX " JNC MPS-8804" ? Thx
I'm newbie. And my teacher assigned me one project: Design circuit for power supply: Voltage: 1.2 - 30 V Current: 2 - 4 A (protection) Can you help me? give me some useful link? Thank you in advance!
Who has already made a ATX power supply from a 12V DC source (from a car sigarette plug)? How do you handle it? Roel
Hi, i want to build a testing jig for a multy output power supply, that checks correct output voltages,ripple etc. the result should be send automatically to a PC. Did anyone ever build such a jig? any ideas?software? Thanks, BULL
can somebody give me directions to websites/articles that describe the design of a ~400W or similar power supply for the computer industry (regular PCs)? I cannot find any such designs on the web. It will be more helpful to find descriptions of design choices, not just a one sheet schematic... Thanks in advance... Cheers