Recent content by seemasdawange

Ok Thanx:smile:

You may not understood previous diagram as there was transistor and battery of 12Volt shown. the simplified diagram is here. you can check this. is that ok? or still have some problems?

Hmm, u r ryt. can u suggest any module den?

check this image. and look at the output waveform. Is it ok? or should i make some changes here also?

yes of course. my load is a relay of 12 Volts and have power ratings of 0.36Watts. that means load current is 30mAmps

No I tried to design it by myself. i read from some source to add series resistance there http://www.designercircuits.com/DesignNote1a.pdf check this pdf u may get the answer. thankx for reply

To limit the current. if voltage goes too high in that case it may protect capacitor by limiting the current

okay. so what should i do? remove it from series? actually this resister also has power loss in form of heat

Here is the schematic.. further circuit is not here. input supply is 230V AC 50Hz as per our country specifications. Simulation is done in ISIS Proteus 8.0

Thanks dats what I'm expecting.

If i use the higher UF capacitor then reactance of the capacitor becomes low and causes higher current to flow through it. Isn't that make any major change in the circuit? in that case is our circuit operate as per our requirement?

I designed one transformerless power supply and did lots of calculations for that. can anyone answer me how to calculate value of capacitor using as a smoothing capacitor parallel to zener.and also tell me if the value of capacitor is larger than required then what changes may occur in the...

Okay.. 12Volts relay I'm using. answer it tomorrow. no problem. gd nyt.actually I have no of ques related to it.. can we discuss it ?

:biggrin:yes correct