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42 Threads found on 220 Vac
Hi all, I have a 220/240 vac, 1.5 HP pump that I am to drive with a relay. I want to suppress the transient voltage and consequent current that will occur (due to the pump coil) at the relay contacts when the contacts are opened using a TVS diode. Which is suitable, 1.5-kW or 3-kW TVS diode?
Hello Is there any way simple to down convert 220ac to 80-90 volt dc with output current less than 100mA?
hello dear forum, 133091 in this circuit there is a shottky diod used between ground and VS however the reverse voltage rating of this shottky diode must be 350 VDC at least , when the mosfet turns ON - ( my circuit runs at 220 vac mains ) isn't ? my question is there a shottky diode with enough high reverse
hello dear forum, I have chosen a varistor for my inverter bypass capacitor protection my circuit is an inverter for high frequency ( 28 KHz ) output it operates from the 220 vac mains so the voltage across bypass caps are about 310 V + %10 the inverter power is about 3 KW my question ; is my varistor selection in the attached pi
hello dear forum, this below circuit is the schematic of an ultrasonic inverter 129223 I want bring the circuit to resonance by playing with the value of inductance between output transformer and the piezo element my question is ; if I display the current and voltage at the 220 vac input with the osciloscope -
Please let me know that I want to make voltage level converter from 220-vac to 15-vac by using Arduino. Can anyone interested to share information?
Hi All I want to make and switch to control light in cabinet. I need to switch 220 vac with triac and reed switch. I will place a magnet to door and I will place main box across magnet. The maximum lenght is 15 cm between door and main box. I think reed switch will work properly. You know reed switchs are normally open and when magnet is get
I am trying to build my 900 VA inverter My problem is in charge battery phase, I don't use external rectifier diodes but I depend on body diode of mosfet transistor (IRF3205). In case of 220 V on primary, the secondary is 16 V but the maximum battery voltage was 12.2 V, and the charge current is 100 mA. What is the wrong ? 10
hi, is there any way to convert 264v dc into 220v will be highly appreciated if someone help.thanks
i had an emergency lamp with a 6v, 4.5 AH lead acid battery & lighting a 14W, 220v CFL lamp, once i had dismantled it due to some charging problem. now i am trying to reassemble it, bt i accidentally cracked a wire from the board, and i am not getting from where it is came out (it is connected to a two way switch), so i need 2 assemble a new circui
Hi everyone, Can't find appropriate solution to convert 220vac to 3.3VDC with the following requirements: - the size on the board should be no more than 40mm x 40mm x 15mm (W x L x H) - power dissipation no more than 300mW - max current 200mA Any ideas? Every answer is appreciated.:-)
hi I want to design the smps with below specifications: Vin=220 vac Vout=1KV to 30KV , Iout-max= 20mA I want to use LLC for it. Is it possible to use LLC for this converter? I want to calculate resonance elements and transformer turn ratio and primary and secondary turns and inductances. The maximum voltage and current that drop on resonan
Hello everyone, i have a problem with my inverter 12 vdc-220 vac (pure sine), that i use for to transform the fotovoltaic energy in to voltage for domestic use. the energy is stored in to some the batteries. we come to the problem. some days ago i realized that my inverter had an malfunction. when i turn on the main switch it not power on soon
Hello everyone, I am designing an inverter, and I have a problem in the rectifier stage. I rectify the 220 vac using a full bridge (and a capacitor), and then I'll use the rectified 300 VDC as the input of my inverter. The problem is that since my inverter has a relatively large load (5-10 A), I will have very high peak currents in the (...)
i want to design rgb bulb led light which take electricity directly from 220 vac or 110 vac source and light up the bulb, any help? What do you mean directly? LED needs DC ...
Modern TVs are usually specified for 90 to 260 V AC input as all use a switching power supply inside which can accept the complete input ACvoltage range. If your particular TV only is specified for 220 vac, then a 110/220 V inverter should work, too. Only please make sure that the inverter does not generate overvoltage with a low-power load (...)
Typical FETs allow units of volts between gate and channel, so it is a nonsense to drive the device from 220 vac. You must use a voltage divider or a transformer. From your question it looks that you have no idea how a FET works; find a good textbook and learn the basics before 220 V AC can kill you.
hey guys. I would like to control an exhaust fan 220 vac that will vary the speed by the reading of smoke sensor. The fan is 50Hz and only 1 speed (1 phase i suppose?) Let step a side with the sensor. The varying speed will be occurred when I turn off and on the fan in a certain time. For the switching for lamp dimmer or fan controller it pop
How do you know that the transformer is made for 110/220 vac without a specification and connection diagram? Presuming you know it is, you'll want to measure winding resistances to understand how the wires are connected. I guess that red/red is for 220V and red/black (either of both red wires) is for 110V.
dear all please help me,i have a trouble with my machine,the power suplly is destroy:cry:. can't you hlep me schematic power supply input 220vac to output 160VDC,2Ampere(out put can be adjust with potentiometer range 0-160VDC) thanks alot for you attention