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    500W 12v to 220v Inverter

    thanks audioguru for that piece of info. So are you saying that the 4 paralled transistors though each has a power dissipation of 115W alone when the are put together we get  only 50W dissipated,how come?
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    500W 12v to 220v Inverter

    I fixed the problem on the oscillator so evrything is working ok now. I mounted the 4 2N3055 on one heatsink for each cycle,say when we have 1 cycle so i was curious as to how much heat they are  going to dissipate.you last said you need the specs for the heatsink so i was wondering what you...
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    500W 12v to 220v Inverter

    i am having problems with my square wave generator.What is happening is that at the pins 10 and 11 of the CD4047 there is a constant voltage(I am using 5 Volts d.c to prevent heating of the chip) instead of the original square wave that i was getting initially when i connected the circuit.Then...
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    500W 12v to 220v Inverter

    hie i was wondering if you could use 3A power diodes in place of the 2A  for back emf protection? Does the 100R,1/4W resistor on the schematic mean 100 Ohms or you  can use any value of R as long as the ratio between the 100R,1/4W and 0.1R,10W is maintained? Can i use a 60A Circuit breaker in ...
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    500W 12v to 220v Inverter

    On the schematic given for the 500W inverter,ther are values given as 100R,1/4W is this suppossed to be 100 Ohms,1/4W or I can use any value for R as long as it has 1/4w dissipated? The darlington paired transistors;are they to be used for amplifyng the signal out of the CD4047 chip or  for...
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    500W 12v to 220v Inverter

    What type of loads/appliances/devices can be used with this inverter because i believe we can't use it on critical loads like  a computer or some other data capturing devices? What is the purpose of the 0.1Ohm,10Watt resistor?Why can't we use a wire for short circuiting if that is what we want...
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    500W 12v to 220v Inverter

    just how much  load would the circuit be able to withstand if i use my 0.24 Ohms which dissipates about 3Watts on the emitter side of the resistors because they are the only ones that i can find close enough to the 0.1 Ohms,10W resistors? I am asking this because i don't necessarily have to...
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    500W 12v to 220v Inverter

    audioguru if  i use my circuit on a device that requires about 400w of power using the 0.24,3W emitter resistors,they should work shouldn't they?I'm asking this because the last time i spoke to you,you said they would blow
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    500W 12v to 220v Inverter

    just how much power can you handle if you use 0.24 Ohms.3W on the emitter resistance and how do you find that out(mathematically i mean)? How is one heatsink different from the other?I thought they were all the same.
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    500W 12v to 220v Inverter

    Audioguru,i think using resistors is a wise idea coz i'm positive the transistors will blow but i have decided to use the 0.2 Ohms,3W in place of the 0.1 Ohm,10W so does that have any effect on the circuit?Hope not. I got the transformer so lets wait and see what happens when i connect the...
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    500W 12v to 220v Inverter

    audioguru,Cooperman how are you?The reason why i thought of using the 4.7Ohms was because i could not find any 0.1 Ohms,10W resistors in my town(Harare,Zimbabwe) so had not put into consideration that voltage drop across the resistors.However I thought that the current from the pre driver...
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    500W 12v to 220v Inverter

    hey you guys how are you doing?It's been long hasn't it?Anyway i'm back and i got more  questions than answers. First,does the ratio of the 0.1R,1/4W Resistor to the 0.1R,10W Resistor have any effect on the power output because i managed to get 4.7Ohms,10W and 4.7k,1/4W so i don't know if i can...
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    500W 12v to 220v Inverter

    audioguru thanks,what you said is what i had in mind but i wasn't sure about the calculations of the gains,for example,the LM358 OP AMP. The 2SC1061 has a minimum gain of 35, the 2N3055 has a gain of 20 so aren't you supposed to use that in your calculations? You know what?Maybe it would be...
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    500W 12v to 220v Inverter

    hie, i just joined the community and i was hoping that somebody,anyone pliz help by explaining the modified inverter that Ronnie.B.Tabanao showed.I could really use some help coz i can't understand it. I
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