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thnx all .yeah by transformerless i mean that it has to use a high frequency transformer.
one more thing . since ill be desigining an offline ups for PC then the system will turn off if the switching is not fast between mains and inverter.what shud be the switching time between mains and...
Hi,
I want to design a small modified sine wave transformerless ups (400 Watt) .Can anyone help me with the block diagram and schematic?? Will be extremely thankful .
Re: Antenna query
Thanks for the positive response .
What i was asking is that suppose if i have a transmitting antenna then is it possible to know whether it is horizontally polarized or vertically by the physical look of the antenna .
Secondly in order to plot the radiation pattern...
Can any one tell me that how is it possible to recognize an antenna's polarization just by looking at the antenna ?
Secondly for modulation is it possible that the frequency of the carrier is less than the information signal ??
lm317 charger
Thnx for d reply but im not talking abt the regulator LM317 but i am talking abt the transistor BC547. Can it be replaced by any other componenet and if so then how will the ckt work .Also plz tell me the path of the current flow when the ckt is in working condition.
lm317 battery charger
hey can anyone tell me that can this transistor be replaced in the ckt and if it can be then by which component and how will the circuit then work .An immediate reply is requested.
Im pasting the link which is :
**broken link removed**
Hello,
I have been working on this charger circuit for quite some time this is a constant voltage battery charger . The problem is that i dont know that how does the ckt actually works especially the need of the transisitor BC547 .Whether the working of this transisitor is dependent on the...
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