Muhammad Abu Bakar

O.K. I can c my misunderstandings. T1 is Common collector config I Think. Then what is the thing which stops output of T1 again becoming I/P to the IC1. Why current o/p at emitter won't produce voltage at VR1 and hence feed back internally??? Audioguru I was thinking of a circuit to have intercom with high mic sensitivity & Loud Speakers, to interconnect two parts of my house. Is it possible?

YOU can have a very cheap power supply from TI's Isolated DC/DC Converter IC's Series. One such chip is PT4310 Series —48V 6-W Low-Profile Dual-Output Isolated DC/DC Converter Its main features include • Dual Complimentary Outputs • Wide Input Voltage: 38 V to 75 V • 1,500 VDC Isolation • 9 Pin DIP Package • No External Components Required As TI people are very generous in distributing there samples, so u can have a sophisticated lab Power Supply with almost no effort. Regards :) :) :)

For close proximity the technique is to use Ultra Sonics. The working is similiar to RF but at much lower frequency.

I can't see a power supply filter capacitor here. Perhaps T1's function is voltage regulation. However this is the only circuit I have seen w/o a large caps fltr

Is it graphical simulation? Then better use flash or things like that. It it involves electronics then plz explain what is ur idea

Dears, I have experienced a lot of trouble in visiting electronics-lab site from my dial-up. I think it nearly takes ten times more time to load a web page than anyother site. Has someone else also experienced it? Whats the reason? ???

Please send a copy to me as well !!!!!!!!!!!!!!!

I need it!!!

I want data sheets for these IC's too um91215 hm9209

IRDetectors are much more costly then a green led .However a simple led (eg green or ret or else) can be used as an IR detector. Will somebody tell about its theory. I have not experimented it yet .

I have got 89c238 upc (from philips) I haven't got any info about it.plz help me in its data sheet and programming strategy