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Old 13th November 2010, 02:31 PM   #21
yagoolar is offline yagoolar  Poland
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Quote:
Originally Posted by tinitus View Post

what does two secondaries mean ?
See attached picture. One can connect primaries and secondaries in series or parallel.
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File Type: png OPT-connection.png (10.3 KB, 487 views)
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Old 13th November 2010, 02:33 PM   #22
tinitus is offline tinitus  Europe
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ehh, shouldnt the cap be coupled to other side of cathode resistor, directly to ground ?

are you sure your "opt" is not an interstage, and not an opt ?
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File Type: png 20101112 C3g 6C4C noled PF cap cath-trafo 1u-100u.png (30.3 KB, 493 views)
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Old 13th November 2010, 02:53 PM   #23
yagoolar is offline yagoolar  Poland
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Default OPT

The xformer is definitely an OPT - 10W does not imply an IT, does it? I have used it before with 6C4C SE - it is air gapped one.

I changed cap connection as you suggested - the same response.

So it is time to make it real.

Last edited by yagoolar; 13th November 2010 at 03:04 PM.
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Old 13th November 2010, 03:09 PM   #24
yagoolar is offline yagoolar  Poland
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See e.g. this amp AFA parafeedcap (value) is concerned:
MagneQuest Transformers: DIY Schematics w/ MagneQuest Iron
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Old 13th November 2010, 04:10 PM   #25
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by yagoolar View Post
See e.g. this amp AFA parafeedcap (value) is concerned:
I suppose the cap is to block DC, thus its cut frequency depends on actual impedance
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Old 13th November 2010, 05:10 PM   #26
yagoolar is offline yagoolar  Poland
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Quote:
Originally Posted by tinitus View Post
I suppose the cap is to block DC, thus its cut frequency depends on actual impedance
More on math regarding parafeed, read here: DHTsound
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Old 23rd November 2010, 09:12 PM   #27
yagoolar is offline yagoolar  Poland
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I think I reached the optimal schematic. So I start building a prototype.

First approach of a look below
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File Type: png 20101123 C3g 6C4C led PF.png (35.1 KB, 520 views)
File Type: jpg 155195_168325973200500_100000692961335_391869_5283308_n.jpg (49.2 KB, 512 views)

Last edited by yagoolar; 23rd November 2010 at 09:38 PM.
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Old 20th December 2010, 08:26 PM   #28
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There is a mistake in supply voltages labels - Eav1 should be 220V and Eav2 should be 360V
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Old 20th December 2010, 09:46 PM   #29
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Quote:
Originally Posted by yagoolar View Post
There is a mistake in supply voltages labels - Eav1 should be 220V and Eav2 should be 360V
Nope, wrong again. Correct values are:
Eav1 (c3g) = Ua triode connected + Ia*Ra = 200V + 15k*13mA = 395V, Uf LED voltage disregarded
Eav2 = Ua +Ia*Rl+ nUf =250V + 62mA*270ohm + 45V = 311,74V -> 310V

Last edited by yagoolar; 20th December 2010 at 09:49 PM.
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Old 1st October 2012, 07:13 PM   #30
yagoolar is offline yagoolar  Poland
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Default All is calculated

Recent schematic of the amp. Now assembly.
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File Type: png 20120925_C3g_6c4c_PF_LED.PNG (28.2 KB, 318 views)
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