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2014-03-01 by <josh.nursing@gmail.com>
2014-03-01 by Bob Grieb
Better to measure at IC7-7. After IC18-14 there is an RC filter and then a unity gain voltage follower/buffer. You can measure at IC7-7 without disturbing the voltage. How do you know these value are incorrect? What were you expecting? I will measure mine later and see what I get at CN05-13. Bob ________________________________
From: "josh.nursing@gmail.com" <josh.nursing@gmail.com>
To: PolySix@yahoogroups.com
Sent: Saturday, March 1, 2014 8:49 AM
Subject: [PolySix] KLM-367 voltage deviations.
My volt readings have been off on KLM-367 for a while:
Cutoff VCF CN5-13 gives 7.43V | -7.37V
I18-14 gives -3.56V | 3.64V
Power supply readings on CN2 pins are all fine.
Yash2014-03-01 by <josh.nursing@gmail.com>
2014-03-01 by Bob Grieb
Hi Josh,
Here is what I measure (poly, manual)
Cutoff Ctl at 10: IC7-7 = 4.91 IC8-1= -7.36V
Cutoff at 0: IC7-1 = -4.98 IC8-1 = 7.49
I would suggest making the earlier measurement after the buffer.
Your meter may be loading down the voltage. Anyway, the important
voltage is the one that's later in the circuit, and here our numbers are
very close.
It seems your expected values were spot on, within circuit tolerances.
Bob
________________________________ From: "josh.nursing@gmail.com" <josh.nursing@gmail.com>
To: PolySix@yahoogroups.com
Sent: Saturday, March 1, 2014 8:49 AM
Subject: [PolySix] KLM-367 voltage deviations.
My volt readings have been off on KLM-367 for a while:
Cutoff VCF CN5-13 gives 7.43V | -7.37V
I18-14 gives -3.56V | 3.64V
Power supply readings on CN2 pins are all fine.
Yash2014-03-01 by <josh.nursing@gmail.com>
2014-03-01 by Bob Grieb
Oops! Should be IC7-1 Sorry about the typo. Bob ________________________________
From: Bob Grieb <bobgrieb@yahoo.com>
To: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com>
Sent: Saturday, March 1, 2014 1:20 PM
Subject: Re: [PolySix] KLM-367 voltage deviations.
Hi Josh,
Here is what I measure (poly, manual)
Cutoff Ctl at 10: IC7-7 = 4.91 IC8-1= -7.36V
Cutoff at 0: IC7-1 = -4.98 IC8-1 = 7.49
I would suggest making the earlier measurement after the buffer.
Your meter may be loading down the voltage. Anyway, the important
voltage is the one that's later in the circuit, and here our numbers are
very close.
It seems your expected values were spot on, within circuit tolerances.
Bob
________________________________
From: "josh.nursing@gmail.com" <josh.nursing@gmail.com>
To: PolySix@yahoogroups.com
Sent: Saturday, March 1, 2014 8:49 AM
Subject: [PolySix] KLM-367 voltage deviations.
My volt readings have been off on KLM-367 for a while:
Cutoff VCF CN5-13 gives 7.43V | -7.37V
I18-14 gives -3.56V | 3.64V
Power supply readings on CN2 pins are all fine.
Yash2014-03-01 by <josh.nursing@gmail.com>