Search Engine

1000 Threads found on Power Supply Coupling
Hi All, I need to feed the board power supply via a 3-meter cable(dc power supply is generating on the mother board). I just wonder how can we calculate a suitable de-coupling capacitor value in this situation? We always use a big enough cap and low esr type but is there any proper way to calculate the (...)
Hi there, I am designing a circuit, and using a 3A Switcher for my power supply. I am using an ultrasonic sensor that says it can draw up to 2A when active. How should I protect this from bringing the rest of my rails down? Is Bulk capacitance/series resistance good enough, or should I filter out my other devices more than just a simple decoupl
Hi All, Please give me details of voltage regulator or LDO for generating 1.2V. Thanks, Gold_kiss If you like a plug-and-play solution see: only one resistor to generate any value from 0.76 to 3.6 v starting from 3v to 5V input
mm , it seems interesting topic , i don't about it but i think it is related to that the PLL in aquastion phase can be feed with very regulated voltage but this source can source high current due to charge pump current , but as the PLL coming close 2 lock require the regulator to be very good and the noise in power supply is minimum 2 get the b
Hello, with friends work on precision laboratory power supply 0-50V 0-10A with 16bit digital control. In first step we design dc step down with Synchronous Buck Controller LM5116, in second step precision linear regulation see below on picture. Digital control is MCU with 24bit ADC and 16bit DAC , control voltage 0-10V Question 1. (...)
You don't measure the input power. It's actually V1*I(V1). As a hint: You can also determine the power factor from an I1 fourier transformation respectively THD measurement.
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 (...)
why we use dual power supply in op amps ??? :roll:
You shouldn't need more than a few uF for the microcontroller. If it requires more, then something isn't working right. Are the heatsinks you added to the H bridge electrically isolated from the H bridge? You'll have to post a schematic showing how your MCU and its power supply is related to the H bridge. I agree, w
Hi Friends, I really facing big issue with the isolation issue in our circuitry. We isolated the microcontroller power supply from other noisy power supply completely. There is no direct connection between these grounds at all. But, I observed 400mV noise at the microcontroller pin even though it is not (...)
Its x band 9.3 to 9.5 GHz and load as well as source impedance is 50 ohms.I have selected coupling and decoupling capacitor of 0.1uf. As you are interested in DC power-supply blocking, that circuit certainly does not have 50 Ohms...
Dear all, I get hold on a 30 V 3A dual bench power supply Selectronic SL-1731SB, which seems to be the same as the Velleman PS23023, and may some other ones. Both canals are OK, but when I coupled them in series, the coupling is totally wrong example Tracking not activated : A : 5.4 V B: 10.3 V Tracking activated : A :25 V (...)
On 2001-05-01 23:18, Rfboy wrote: 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 put your email i will send you pdf files.
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?
I suggest use old TV set, only decrease power supply voltage. I used this approaches several time for low-current supply, It works fine.
Hi, I try to explain very briefly: VAC = Voltage, Alternating Current You can find this voltage in wall-outlets, the well-known mains voltage with 50 or 60Hz frequency or a Voltage coming from a mains' transformer secondary winding (opposite of VDC which comes from batteries or rectified and filtered supplies) VA = Volt x Amper, power when t
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
Check out OP548 (I think it is called) a power OP with built in current limit. That OP with a CPU with two PWM outputs will make a very few component PSU. Check out TI for free samples sent overnight with UPS. Very impressive. MrEd
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
switched power supply generates less heath, uses less (battery) power but is more complex and needs measures against emc. Switchers are used when power is high to save energy and minimize cooling. Also when power is not so high but it comes from a battery. Linear supplies are used when battery life and heath (...)
Hi, My PS1 9001 fall down from my hand, When i connect it to the power supply, it didn't work. The power led indictor is off So i assume that the fault in power supply unit. So any way of getting a power supply schematic for the PS1 9001 ? Thanks for any help, (...)
Look at: 0-30 VDC STABILIZED power supply WITH CURRENT CONTROL 0.002-3 A
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 Since the switching device is a MOS, the critic part is not the IC itself. Look at the power supply section of the ARRL Radio Amateur's Handbook (it is also available in PDF fo
You are getting into serious safety problems if you draw power from the utility mains without any transformer between. The only way to overcome this is to have your circuit totally cased in insulating material of two independent layers (double shielding). The minimum power supply would be one transformer between one phase and neutral. The (...)
hi, Transformerless power supply.
+30V power supply, how to? tips and schematix
modified the PC power
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
Here's a schematic for a 200W ATX PC power supply:
It is usually used for low power supply like battary charger.
You also can find detailed explanation on No need to build schematic.I can't remember clearly but you should connect power good pin (green) to vcc.(I'm not sure please have reference)
It depends on the chip and some times your power supply if and how you need to do it. For the chip, the manufacture should be able to answer that. Usually it shouldn’t differ more than about a diode voltage drop. If you have create your voltages with linear regulator, it’s probably not a problem, because a linear regulator follows
Do you mean that is normal to receive 50Kv peaks on your power line?? or you need 50Kv to prevent for lighting??. If it's only to prevent from lighting, you can protect the input of your power supply using sidactors, PTC, and ceramic dischargers, using it you can clamp the final voltage at input of the power (...)
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, One good appnote for current sensing: For Voltage sensing, is quite easy. For control, you must use switch mode power supply (browse the Web) NeuralC
yes for MPPT you must implement some way to control the voltage (or current) output of the solar panel. most people use a SMPS. but really, this does *not* add extra circuitry because often people have a SMPS at the output of their solar panels anyways! to create varying DC bus levels.. then you do not have to have certain # of panels to get ce
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 .