A mail from reader

Hi Raghavendra,

This is prabhushankar from Tirupati,AP. I am a regular reader of yur blog. It is so helpfull to me.

Also your multiple talent astonished me. I have some dought regarding Transistor that is some transistor shows short from base to emmitor. even in new pieces purchaced from market.but if I

put it into board it will work.

Why dont you write ebooks?

tnks

prabhu

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Hi Prabhu,

Thanks for the support.

The type of transistor you had asked doubt about is a special kind of transistor.

Even though it appears to be a single transistor, it is combination of two transistor as shown in figure.

if the understanding the figure is difficult, then you think that there is a diode connected between collector and emmitor and a resistor connected from base to emmitor, and test thinking like that.

COllector to emmitor it should behave like a diode if u test.

also from base to emmitor it will show some 40-100 ohms.

To give an idea the name of diode will contain "D". ex : 2SD2188, D546 like that

Thanks

Raghavendra