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Old 9th January 2015, 12:57 AM   #1
iNSuL is offline iNSuL  United States
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Default Aikido 12VAC Help needed

For anyone who has built it, what is the value of C1? I dont see it listed in the manual.
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Old 9th January 2015, 01:07 AM   #2
rayma is offline rayma  United States
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Originally Posted by iNSuL View Post
For anyone who has built it, what is the value of C1? I dont see it listed in the manual.
There doesn't seem to be a C1, do you mean C11? That would be several 10s of uF.
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Old 9th January 2015, 01:14 AM   #3
iNSuL is offline iNSuL  United States
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On the posted schematic C1 sits between R12 and R10. In parallel to C11 and C2
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Old 9th January 2015, 01:28 AM   #4
rayma is offline rayma  United States
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Originally Posted by iNSuL View Post
On the posted schematic C1 sits between R12 and R10. In parallel to C11 and C2
Oh yes, that's the hum canceling circuit for the current sources. It passes hum from the B+ to the two grids through the resistor divider.
The C1 should set a corner of 5Hz or less (so as not to cause too much phase shift at the hum frequencies) with the series sum of R13 and the resistor below it.
That resistor is misnumbered as R10. It is not the same value as the two R10 grid stoppers.
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Old 9th January 2015, 01:29 AM   #5
Smoke is offline Smoke  Canada
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.1-1 uf according to the other designs
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Old 9th January 2015, 01:34 AM   #6
rayma is offline rayma  United States
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Originally Posted by Smoke View Post
.1-1 uf according to the other designs
The capacitor value depends on the resistors that it feeds.
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Old 9th January 2015, 01:39 AM   #7
iNSuL is offline iNSuL  United States
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So the values are R11-1k and R10-88.7k
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Old 9th January 2015, 01:46 AM   #8
iNSuL is offline iNSuL  United States
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How do I go about calculating the value based off the resistors? Thanks for all your input
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Old 9th January 2015, 01:50 AM   #9
rayma is offline rayma  United States
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Originally Posted by iNSuL View Post
So the values are R11-1k and R10-88.7k
You need to know the two resistors directly below the C1, which are labeled R10 and R13. (That R10 is not the same value as the R10s on the grids, it's a numbering mistake.) Add the R10 and R13, and then set the capacitor C1 value so the corner is below 10 Hz. C1 = 1 / ( 2 x 3.14 x 10 x ( R10 + R13 ) )
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Old 9th January 2015, 01:54 AM   #10
iNSuL is offline iNSuL  United States
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Awesome, thank you so much for the help!!
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