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Old 19th September 2018, 02:15 PM   #1631
Botte is offline Botte  United States
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I typically only have +-10 mv offset. I'm using a different bias system than you with the thermistors on each puck. So the offset starts about 100 mv cold and then settles in after about 20 minutes.
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Old 28th September 2018, 01:58 AM   #1632
lhquam is offline lhquam  United States
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Good to hear those results. I built some PCBs using thermistors on the pucks, but was not happy with the stability of the bias current. Offset can be handled by negate DC feedback.
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Old 11th October 2018, 11:52 PM   #1633
flancfuster is offline flancfuster  Europe
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Do you guys think is it posible to bridge the channels and make it balanced?
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Old 11th October 2018, 11:54 PM   #1634
Zen Mod is online now Zen Mod  Serbia
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yup

even SUSY

or Ultrasymmetric , even if Pa is vague ........... term existing or not

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Old 12th October 2018, 01:50 AM   #1635
lhquam is offline lhquam  United States
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Not sure. There could be some "dualing servo" issues with respect to the interactions of the bias circuits. I do not understand the control theory involved to make a decisive conclusion.
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Old 20th October 2018, 09:22 AM   #1636
flancfuster is offline flancfuster  Europe
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Quote:
Originally Posted by lhquam View Post
.... Offset can be handled by negate DC feedback.
Is it posible to do it if the front end is AC coupled?
How much of DC offset is "acceptable"?
Thanks.
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Old 20th October 2018, 10:20 AM   #1637
generg is offline generg  Germany
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50mV are still no problem!
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