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zahrein
Joined: 28 May 2004
Posts: 144
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 30 Aug 2004 5:43 Transistor question ? |
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at the base junction. i have a capacitor connected to the
base(transistor) and a resistor is connected to the capacitor and it is grounded?
can this circuit work?
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samcheetah
Joined: 25 May 2004
Posts: 672
Helped: 31
Location: Pakistan
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| 30 Aug 2004 6:55 Re: Transistor question ? |
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what do u want to do? is it like a cap and a resistor is connected in series with the base terminal and then connected to the ground. is there some biasing too? like a voltage divider bias?
a schematic would be helpful
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echo47
Joined: 07 Apr 2002
Posts: 4205
Helped: 565
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| 30 Aug 2004 7:02 Transistor question ? |
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zahrein, do *you* think it would work? Why, or why not?
Please show us that you have thought about your homework questions, and then maybe we will help you!
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Kevin Weddle
Joined: 10 Jul 2004
Posts: 101
Location: San Antonio, TX
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| 30 Aug 2004 17:17 Re: Transistor question ? |
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| No, you need the DC bias. I think you are confusing the property of voltage and it's rate of change with DC biasing. There is no way around the fact that a signal goes through a capacitor and the bias on the other side is a DC.
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samcheetah
Joined: 25 May 2004
Posts: 672
Helped: 31
Location: Pakistan
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| 30 Aug 2004 19:07 Re: Transistor question ? |
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i agree with u kevin. but if u have an FET that maybe there would be some "self bias" and maybe the circuit could do something. but the person asking the question was probably referring to BJTs so i think that isnt a possibility. i wonder if such a set up will be of some use in the FET domain 
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Kevin Weddle
Joined: 10 Jul 2004
Posts: 101
Location: San Antonio, TX
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| 31 Aug 2004 14:25 Re: Transistor question ? |
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| If you ground the gate of a FET you get current. With a capacitor there is an open circuit at DC. I think there exists a small amount of gate current to make the FET operate. I don't think there is enough bias with a gate capacitor in the way. An open circuit will cause the gate voltage to equal the source voltage anyway.
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Andre3000
Joined: 25 Aug 2004
Posts: 18
Helped: 2
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| 12 Sep 2004 17:14 Transistor question ? |
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| if you have DC bias it can work
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zkai2000
Joined: 25 Jul 2004
Posts: 94
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| 12 Sep 2004 18:39 Re: Transistor question ? |
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| a resistor and capacitor..is he doing a RC connection b4 the base?
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 13 Sep 2004 0:25 Transistor question ? |
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| A transistor without a DC bias can do squat! Remember that! Where is the schematic?
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