nura100

Hi Salahadeen, i have drawn a circuit that might be of help to you, best of luck ! arun

Hello Olalekan, you've asked about "cold Starting", Let me explain: if you are using your PC which is connected to your present UPS and there is a Power Failure, the UPS continues to supply Power to your PC in Split Second changeover. this is called Warm booting. consider a situation when there is a Power Failure and you want to use your PC which was not ON till that moment and you switch on your UPS during Power Failure to Power your PC this is called COLD Start , this can be fatal, if your UPS doesn't Support COLD start feature. during Cold Start, the PC draws Heavy Current

Hi Olalekan, It is difficult to home brew an SMPS Battery charger, unless you are fully experienced with Switching Supplies. you can Purchase a readymade SMPS 12V, Battery charger kit and use it, it is worth the investment, than trafo charger. as suggested by Mvadu you have to use a Cooling Fan, otherwise you can Kiss your UPS goodbye! if your are intending to use this Modified UPs for things other than Computer, like fans, TV etc, there is very chance of Over Loading the UPS. limit your Load to 150 Watts only. Secondly, does your UPS Support COLD Starting, if it does then no problem, but if it doesn't then there is no point in going for this modification. Arun

Hello olalekan ! you can use a

Hello Frankie, i guess you can try using a 12 Volts DC Soldering Iron tied to the Fuel Line(10 inches) or use a 12 volts DC Diesel heater used in

Hello aniruddha i don't know what you are upto? ::) i defintely have answer for your thrid Question: No, it wouldn't act like a Diode, but you'd hear a bang, then your room will be filled with fine mist when that Polarised electrolytic Cap is put in wrongly(polarity) this is my personal Experience! why do you want to use Costly Caps as diodes when that job has been taken up by cheap diodes nura

Hello Friend :) First of all , your Inkjet/dotmatrix Printer cannot be used to make PCBs, bCoz of the resolution issues.(the characters are formed by minute dots of soluble ink) :( secondly you cannot use the photocopier method if you are using inkjet printout, bcoz the Copier doesnot improve the resolution of the Master copy (inkjet printout) >:( heres the answer, prepare your Artwork in PDF or Word Format and take it to a nearby Laserprinter Shop and get a minimum 600dpi res. print on MATT finish Coated INKJET paper (not the Thick paper, it should be two colored, i.e one side half white and other side bright white). ;) Some laserprinters have PIN Holes problem, which your can overcome if your art work is designed in fine resolution. ::) once you have your Artwork on the paper, you know how to iron it on! 8) bye nura

Hello Audioguru & alun :D Musty Send me a personal Request, for some other Project, which i replied. i did project some 8 Months back, got the the final result by combing some of my earlier projects. 3- 4 schematics were used. ;D i drew the schematic on some piece of paper at work place, i'll have to redraw this schematic in Eagle or Smart Draw. it'll take time. Meanwhile, i can Explain how the whole thing works. here's the BOM (bill of Material): Cd 4017 Cd 4016 Tsop 1736 Relays -5 nos 555 IC BC 547 -5 Nos Bc 558-1 Nos LEds-6 Caps + Resis Etc. working in brief : Tsop !738 detects Modulated IR signal from the Remote and is amplified by BC 558, to Trigger the Pin 2 of 555 Ic, a neat Clock Pulse is Obtained at Pin 3 of 555 IC, which is Applied to clock inputs of decade counter 4017 & Sevent segment Driver 4026. out of Q0- Q9 outputs of 4017, only 6 O/P s are used here. at the time of reset or power on - Q0 is high which drives a RED LED which is used as an "OFF" indicator. on each press of Remote, the Output state of 4017 advances from Q0 -Q5. ons on Sixth key press the counter is reset. Bc 547 trans are wired to the outputs of the counter to drive each relay which tap the Wire wound Fan Regulator Resistor. I chose W/W resistor gives clean Sine wave Output than the dimmers, and no EMI noise . ;D (i have also built another remote regulator using Full-Wave Phase Controller. which doesn't use relays) ;) at any instance only one Relay is Energized and all other are OFF. the Same way Display Driver advances from 0 to 5 and resets on sixth key press. here are few pics, i wanted to post Mpeg file but thats 5 MB file ??? hope this gives a clear picture, Musty! nura ;)

Hello Musty! ;) Check your Yahoo mail box, i have replied to your Mail. :D i have already built the project you are talking about. i built this one ,bcoz iam lazy to get up and adjust Fan speed when watching TV, on computer etc. ;D i just point the TV Remote to the Sensor and Switch the Speeds. Here's My Project Pics. I have used 7 Segment LED Display to Indicate Fan Speed. It goes from 0 to 5. Nura

Hello Sasi :D the big Diodes, capcitors, 220 Ohms -high wattage Resistor, all these components are used for Protecting the Mosfets from High Voltage Stress & Spikes from the Trafo. if u are not using them correctly, the Mosfets are at risk. since you have Vol- 19 of EFY Projects, there is a PWM Inverter Construction project by Mr. Bashin, using SG 3525, the author has used simple Setup to Drive Mosfets without using BC 557s & BC 547s. the Spike protection for mosfets looks good. :D Did you try that circuit ? ??? here's the Circuit ;D arun

Hello Sasi, there is an error in your Controller board Silkscreen the 6 amp diodes(diode pairs) are reversely connected, they should be connected the other way round. i've circled them in the Pic. :D have you checked this ;) arun

Hello Ante thankx for your Table. ;D nura

Sasi, I also have noticed on your Mosfet Board you have used MOVs which are not present in the Output schematic ??? were these later added ? arun :)

Pair of diodes befor the Series Capacitors

Hello Sasi ! Today, i was just going thru your Pcbs & Schematics in this thread, i felt there were inconsist with each other. ( hold a second, Don't get angry!) what i mean is - the output mosfet section schematic shows only 33 Ohms gate resistors , but your Board shows Gate resistors + Diodes+ diode or resistors. and also in the Oscillator section, in the schematic you have shown one diode, but on the board there are a Pair of diodes. a final request, your PCBs are helpful to any member who wud like to build an inverter, so can you post the Silk screen with the Component Values instead of just Component outlines. arun

Hello People! ;D iam winding a Ferrite Trafo for use in DC CFL driver, the Winding Data is given in Silicon Chip Mag, My Problem is the wire guage is given in mm, but here we follow SWG . i have tried some conversion sites on the net but the result was not consistent. i need the SWG equivalent of : 1 MM = 0.25 MM = thankx arun

Hello Majorthom! here's few Statistics

Hello Electroremy :D I have tried your CIDESS , Its Wonderful and Simple. :D i have

Hello sunny :) the above circuit finds its application Mainly in Protecting Refrigerator, and Air conditioners. you can also use it to protect your Mains Operated Appliance like TV, Music System etc, but these things don't require the Time Delay Feature. One more important area where you can use this circuit is "Inverter & UPS". when there are Fluctuations in Mains Supply, the Relay Cuts the Supply to the mains Sensing Section of the inverter and during the delay period the inverter or UPs takes over & Provide supply to the load and once the delay is ended, supply returns to the Mains. Got it ;) Arun

Steven one Word "AAAAmazing" ;) arun

So is SG 3524 arun

Hello Sasi, Your Cutoffs circuit could be further simplified, using just one Relay or Mosfet. instead of using 3 relays and bigger PCB. i have redrawn the circuit which we use in our Emergency Lights, the circuit uses all

i think we should take a break ! :D Enough of Circuit Talk

Dear Akash, Yes, We have a circuit for running CFL from 12 V, it costs Rs.150, its a double transistor Push-Pull type oscillator, you can run 5W-36W, 2 Pin or 4 Pin CFL on it, we make this circuits for small vendors(Ice cream sellers,Pan shops, STD Booths etc) who don't have mains supply. A note to Moderator(MP)

BPB If i am not wrong, the Last schematic in this (BPB) manual is "how to connect LCD /LED display to any inverter's indications", which Gives Messages like A C- O N ,DC- ON, LB, OL there are only 4 (2 + 2) 7 segment LED displays used