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Old 11th January 2013, 12:54 PM   #8971
Salas is online now Salas  Greece
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2.2V is little. The sense circuit must be tied to the force circuit terminated with a load consuming much less than the CCS circuit provides. It should show Vout at its tips too. Is it configured like that now you measure?
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Old 11th January 2013, 01:19 PM   #8972
zeeuw is offline zeeuw  Netherlands
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the load is the phono stage
but the BF245 can only take 30v, so maybe broken
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Old 11th January 2013, 01:25 PM   #8973
Salas is online now Salas  Greece
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Should only see VGS across it when all is working well. This version has been built successfully many times in this thread, you will surely debug it.
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Old 11th January 2013, 01:28 PM   #8974
zeeuw is offline zeeuw  Netherlands
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replaced Q2 (BF245) with 1k, nothing changes
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Old 11th January 2013, 01:40 PM   #8975
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See about the output Mosfet orientation and/or health then.
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Old 11th January 2013, 01:40 PM   #8976
zeeuw is offline zeeuw  Netherlands
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thx for your help, will work on it
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Old 11th January 2013, 04:59 PM   #8977
zeeuw is offline zeeuw  Netherlands
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Found it!
I build the shunt as double mono
so I needed to increase R1
I will finish this weekend case
and than listening........
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Old 11th January 2013, 07:01 PM   #8978
Salas is online now Salas  Greece
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OK. Post some pics when finished to show us. Good luck.
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Old 12th January 2013, 12:26 AM   #8979
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Tomorrow, it begins. Here are the boards and prereg.
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Old 12th January 2013, 01:24 AM   #8980
Rush is online now Rush  United States
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Quote:
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Tomorrow, it begins. Here are the boards and prereg.
What boards? Thought this was supposed to be PTP???

Rush
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