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What is the value of this variable resistor ?
What is the value of this variable resistor ?
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Old 23rd November 2019, 10:12 AM   #11
Nounours18200 is offline Nounours18200  France
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Quote:
The measurement current is small, and even if it isn't absolutely accurate, it's enough to see if it is 200R or 600R. Did you try?
Here are the measurement I performed this morning (without desoldering):

LEFT channel:
pin1 -> pin2 = 122 ohms
pin1 -> pin3 = 219 ohms

RIGHT channel:
pin1 -> pin2 = 113 ohms
pin1 -> pin3 = 202 ohms

So this let me think that this variable resistor is 200 ohms...

Last edited by Nounours18200; 23rd November 2019 at 10:15 AM.
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Old 24th November 2019, 06:51 PM   #12
Mark Tillotson is offline Mark Tillotson
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A schematic found for Mimesis 3 suggests a 220 ohm offset adjust VR, no bias adjust AFAICT.
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Old 24th November 2019, 09:08 PM   #13
Onemangang is offline Onemangang  Denmark
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Hi

Mark is correct. There are build threads for this good old amplifier here on diyaudio.
That also shows a 200 ohm'ish trim for offset adjustment.
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Old 24th November 2019, 11:36 PM   #14
forr is offline forr  France
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I have this schematics in my collection. The file name refers to Goldmund Mimesis 3.
Attached Images
File Type: jpg Goldmund_ampwr Mimesis 3 (A2).jpg (157.2 KB, 65 views)

Last edited by forr; 24th November 2019 at 11:40 PM.
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Old 29th November 2019, 04:43 PM   #15
Nounours18200 is offline Nounours18200  France
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Quote:
Mark is correct. There are build threads for this good old amplifier here on diyaudio.
That also shows a 200 ohm'ish trim for offset adjustment.
On the schematic posted by forr just after your reply , the variable resistor is 200 ohms, not 220 ohms.

I have bought and received 200 ohms variable resistors and when I have time to desolder the original ones, I will measure them (to tune the new ones to the same value than the original): I hope that I can use the 200ohms resistors that I have received !??

Thanks
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Old 1st December 2019, 05:50 AM   #16
Mark Tillotson is offline Mark Tillotson
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trimmers are usually 10/20/50 scale, not E12, but people often assume its 10/22/47 scale - for almost any use of a trimmer the value is not crucial, since it can be varied or is used as a divider - substitute 220 for 200 or vice versa - remember tolerances can be +/-20% anyway.
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