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bypass capacitor in a transistor

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neo_star

New Member
i want to kno why the by pass capacitor in the emitor terminal should be electrolytic
 

MikeMl

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Most Helpful Member
When you get over 0.1uF, have you ever compared the physical size of non-electrolytic capacitors to the size/volume of electrolytics?
 

Sceadwian

Banned
Sorry. I had to.
 

dknguyen

Well-Known Member
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Non-electrlytics are also more expensive than electrolytics, especially for large capacitances. THis is pretty much the reason why they are used where they are, rather than some other kind of capacitor...it's pretty much their only advantage.
 

k7elp60

Active Member
It doesn't need to be electrolytic. The value depends upon the lowest frequency to be bypassed. The reactance of the capacitor is generally 1/10 the resistance of the emitter resistor, so the value of the capacitor depends upon the frequency.
 
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