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Old 9th June 2010, 04:05 PM   #1131
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by LOLS View Post
I must be missing something. When I measure the voltage I get +40 Volts on both sides using the center as the common.
you cannot possibly measure +40Vdc on an AC scale when attached to the AC voltage coming from the secondary winding.
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Old 9th June 2010, 04:07 PM   #1132
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Yes, You are missing something: it is 80V DC, not AC, When converting AC to DC it multiplies approx 1.5x
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Old 12th June 2010, 02:42 AM   #1133
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Default fluke

do you like you fluke i have one just like it's never missed a beat i used it for years when i was an auto mech tech now i'm retired and just play with audio

best regards bill
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Old 13th June 2010, 08:42 AM   #1134
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Hi
Why not use capacitor instead of R1?I used 4.7mf MKP with good results.
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Old 14th June 2010, 12:48 AM   #1135
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is a GC LM1875 suitable for my headphone?
it's a 25ohm hifiman HE-5
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Old 14th June 2010, 10:05 AM   #1136
AndrewT is offline AndrewT  Scotland
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the headphone uses much lower level signals.
The chipamp will probably sound noisy on headphones.
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Old 14th June 2010, 03:15 PM   #1137
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Actually, GC works very well as headphone amp: http://www.diyaudio.com/forums/headp...other-try.html
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Old 14th June 2010, 03:16 PM   #1138
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Quote:
Originally Posted by diabloid View Post
Hi
Why not use capacitor instead of R1?I used 4.7mf MKP with good results.
That's been suggested here: Commercial Gainclone kit- building instructions
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Old 14th June 2010, 03:18 PM   #1139
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Originally Posted by snowdog51 View Post
do you like you fluke i have one just like it's never missed a beat i used it for years when i was an auto mech tech now i'm retired and just play with audio
That Fluke is the only (working) scope I have, it's all I need
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Old 24th June 2010, 12:31 PM   #1140
koogar is offline koogar  United Kingdom
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Hey guys

Thought i would show you my finished Kit and chassis to spur some of the first timers like me on

its the Classic kit built as an integated amp 300va 2x25v

The chassis was a scratch built by me from aluminium with a temp Corian front panel before i get a 10mm aluminium plate CNC machined.

The 48mm Volume knob was souced on Ebay from seller 8audio based in china but delivery was quick .

I would just like to thank Peter for all his help on the forum

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I wrote a quick and dirty guide below for bending aluminium if anyones interested in making their own chassis

http://bit.ly/d7ayVE

Have fun

Rupert
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