PCB for cascoded IXYS CCS (tube) - Page 30 - diyAudio
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Old 3rd November 2012, 11:39 AM   #291
10y is offline 10y  Italy
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Quote:
Originally Posted by Gluca View Post
The dropping R before the CCS can be anything > 1k
Hi Luca,

How set the desired voltage and current at output of ccs?

Ciao,

Anto
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Old 3rd November 2012, 12:51 PM   #292
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Current is set via the trimmer P100 (and P200), you cannot set voltage in CCS mode that will depend upon the tube bias. You can set voltage in gyrator mode by trimmer P101* (and P201*) ... se schematics at post 153.
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Old 3rd November 2012, 01:55 PM   #293
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Quote:
Originally Posted by Gluca View Post
Current is set via the trimmer P100 (and P200), you cannot set voltage in CCS mode that will depend upon the tube bias. You can set voltage in gyrator mode by trimmer P101* (and P201*) ... se schematics at post 153.
Thank you Luca.

So if I set fixed negative grid voltage and set a target current by ccs trimmer I will have the working-point voltage on plate.

Le t me now If I am right.

Have you used the gyrator mode ? what difference have you found with ccs?


Anto
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Old 3rd November 2012, 11:12 PM   #294
Gluca is offline Gluca  Italy
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Yes, you are correct. Actually I trim the CCS current to hit the desired plate voltage as my amps are DC coupled (and fixed bias at cathode).

So far, I never used the PCB as gyrator
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Old 5th November 2012, 05:35 PM   #295
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Thank you Gluca!
Resistor on ccs pcb must be 1 watt or more?

Anto
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Old 5th November 2012, 06:13 PM   #296
Gluca is offline Gluca  Italy
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That depends ... W=R*I*I
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Old 6th November 2012, 04:54 PM   #297
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That depends ... W=R*I*I
...and in yours what power value you have selected ?

Gluca I have another question : how much voltage I will add at B+ input ccs for an adequate headroom? If I have a plate voltage of 650 V 100 V added would be right?

Ciao,

Anto
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Old 7th November 2012, 05:05 PM   #298
Gluca is offline Gluca  Italy
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B+ on the plate of the tube plus half the swing you need at the grid of following stage plus headroom

example

650V at the plate
200Vpp to swing the grid of final tube at full power
30V headroom

required voltage at CCS is 650+200/2+30=780V

sum the voltage drop across the resistor to that number
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Old 8th November 2012, 05:31 AM   #299
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Quote:
Originally Posted by Gluca View Post
B+ on the plate of the tube plus half the swing you need at the grid of following stage plus headroom

example

650V at the plate
200Vpp to swing the grid of final tube at full power
30V headroom

required voltage at CCS is 650+200/2+30=780V

sum the voltage drop across the resistor to that number
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Old 8th November 2012, 05:32 AM   #300
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forgot to write, ops....

thank you Gluca.

Anto
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