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Old 9th April 2013, 04:38 PM   #221
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Originally Posted by Jay View Post
I don't like to think of the possibility the output shorted to +V or -V
Who does. Fuses are on PSU, if that is what you are refering to.
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Old 10th April 2013, 11:44 AM   #222
bluevas is offline bluevas  Indonesia
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Jason, the distance between +V and Output and -V are 1 mm , too risky
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Old 10th April 2013, 12:11 PM   #223
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The FR4 material I use has a dielectric strength of 20kV/mm, and it is 3kV/mm for air. For an amp operating on perhaps +/-40V what's the risk? I understand there are specific requirements for un-isolated mains, but at lower voltages and behind galvanic isolation the clearances can be much tighter. I understand the specification for the intended voltage range is 0.6mm / 0.024", so at 1.27mm / 0.050" things should be fine.
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Old 10th April 2013, 12:36 PM   #224
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Hi naf,

Your peeceebee 2sa/2sc version based on shaan almost 8 hours now and still singing Thank you naf for sharing peeceebee layout.


Regards,
Boyet
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Old 10th April 2013, 12:55 PM   #225
naf is offline naf  Indonesia
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Originally Posted by boyet0173 View Post
Hi naf,

Your peeceebee 2sa/2sc version based on shaan almost 8 hours now and still singing Thank you naf for sharing peeceebee layout.


Regards,
Boyet
Yeah nice to hear and you liked it...
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Old 10th April 2013, 01:17 PM   #226
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Yeah nice to hear and you liked it...
Yes and i liked it. I used 2sa1381/2sc3503 for driver and 1k for bias. Its good to my taste.

naf i have pm to you.

Thanks
Boyet
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Old 10th April 2013, 11:55 PM   #227
abetir is offline abetir  Philippines
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Originally Posted by boyet0173 View Post
Hi naf,
Your peeceebee 2sa/2sc version based on shaan almost 8 hours now and still singing Thank you naf for sharing peeceebee layout.
Regards,
Boyet
Hi Boyet!

Just for reference...
Could you post some measurements of your build?
DC offset
AC offset
PSU you are using
Are VAS transistors warming up?

I built ver 1.4 using different devices and is now working but it still needs more test.

Thanks!

BTW. Many thanks to Naf for sharing the lay-out
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Old 11th April 2013, 03:09 AM   #228
Jay is offline Jay  Indonesia
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Originally Posted by jkuetemann View Post
The FR4 material I use has a dielectric strength of...
Not about that... Just in case the copper is not sealed, stupid things can happen, mostly during testing. Even if the chance is small, when expensive speaker is used, that chance must be eliminated.
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Old 11th April 2013, 04:25 AM   #229
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Originally Posted by abetir View Post
Hi Boyet!

Just for reference...
Could you post some measurements of your build?
DC offset
AC offset
PSU you are using
Are VAS transistors warming up?

I built ver 1.4 using different devices and is now working but it still needs more test.

Thanks!

BTW. Many thanks to Naf for sharing the lay-out
Hi Abiter,

Just for reference...
Could you post some measurements of your build?
DC offset - I got 0.0mV after 2 minutes warm up. I set 0.1DCV on the tester. see the tester in the picture.
Calibration - On the 15K Of negative side -V I parallel 78k. Or you can Use 100k trimmer for calibration of dc offset.
and also I parallel 15K in 1000uf. You can do it different value until you can achieve 0.0mV

AC offset - I dont know.
PSU you are using - +-35Vdc 4A. 2pcs. 4700uf/50v only for testing. never tried higher uf I dont have.
Are VAS transistors warming up? - Yes. I Put heatsink to driver.

Do you tried BC550C/560C for the input? Where did you buy?

Thanks,
Boyet
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Old 11th April 2013, 04:56 AM   #230
abetir is offline abetir  Philippines
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Quote:
Originally Posted by boyet0173 View Post
Do you tried BC550C/560C for the input? Where did you buy?

Thanks,
Boyet
Hi Boyet!,

0.0mv wow! that is perfect to the ideal dc offset of an amp.
Measuring AC-offset is the same procedure as dc-offset only that your meter is set to ac. Ideally should also be 0mv when no signal applied. Occurence of high AC-offset could mean oscillation problems (self-generated noise).

I was using the higher voltage BC556B/546B at the input differential. BC550C is available in Raon but the complementary pair BC560C is nowhere to find...

One of these days I will also try Nafs variant as I still have 2SC2240/SA970 in my stock.

Regards!
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