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Old 11th February 2006, 03:55 PM   #1
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Default CCS Biased Class A

I have been playing with this for a while. What do you guys think. I am going to go to work today to build it and see how it sounds.
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Old 11th February 2006, 04:05 PM   #2
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Default Re: CCS Biased Class A

Quote:
Originally posted by davidallancole
I have been playing with this for a while. What do you guys think.
The CCS is biased at 6 amps?...

But, some like it hot ...
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Old 11th February 2006, 04:11 PM   #3
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Not quite. In the simulation it draws 1.8 A. It puts 12 volts out nicely into 8 ohms, with a 1 V input.
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Old 11th February 2006, 04:12 PM   #4
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Quote:
Originally posted by davidallancole
Not quite. In the simulation it draws 1.8 A. It puts 12 volts out nicely into 8 ohms, with a 1 V input.

0,6 Volts (one diode drop ) across 0,1 Ohms is 6 Amps...me thinks...
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Old 11th February 2006, 04:19 PM   #5
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You must have not noticed the 2.5k resistor after the diodes reducing the current.
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Old 11th February 2006, 04:28 PM   #6
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Quote:
Originally posted by davidallancole
You must have not noticed the 2.5k resistor after the diodes reducing the current.
That way your CCS is not thermally stable.

Why not simply , to use a 0,3 Ohms emitter resistor..
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Old 11th February 2006, 04:34 PM   #7
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I built a rough one of these at work two weeks ago. That 2.5k resistor I used was a pot so I could adjust the bias current. The transistors are on some pretty big heatsinks. They barely come above room temperature.
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Old 11th February 2006, 04:36 PM   #8
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Quote:
Originally posted by davidallancole
I built a rough one of these at work two weeks ago. That 2.5k resistor I used was a pot so I could adjust the bias current. The transistors are on some pretty big heatsinks. They barely come above room temperature.
That's ok! ...
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Old 11th February 2006, 04:51 PM   #9
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I just ran some temperature simulations on PSPICE and it showed as it gets warmer the bias current dropped by a few milliamps.
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