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Old 25th August 2013, 03:01 PM   #1061
shaan is offline shaan  India
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Quote:
Originally Posted by JOHN BALI View Post
this is it my newest PeeCeeBee
SUPERKEEWOOT.

John, it'll be healthy for us if you finish it fast. Hard to wait.
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Old 25th August 2013, 03:57 PM   #1062
PMI is offline PMI  United States
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Quote:
Originally Posted by ivanlukic View Post
How high is the output stage current without 470R resistor (with only a pair of 1N4148 diodes)?
Total quiescent Current: 130mA~150mA, including VAS current.
(from notes, depending on how the bias is set, and DC rail variation)

Sample measurement:

Total quiescent current 137mA
Front end: 15.5mA
DC supply: 35.1V

Test conditions: 35V-37.5V DC rail voltage.
Total current measured directly w. meter in series
Front end current measured across 10R resistor which is in series w. the 1N4004 diode, ~15mA.

I can adjust the AC voltage roughly, +/- 1~2V using a Variac (not exactly, I am using a monster of a Superior-Electric Variac bought for scrap prices on ebay). The DC volatage can be adjusted within +/-0.1 thanks to my power supply from MrEvil's thread, but it does drift w. temps.

Total bias (quiescent) current should probably be measured only when the main heatsinks reach stable temperature.

If someone can suggest other test conditions, I will be happy to take some measurements.
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Old 25th August 2013, 04:36 PM   #1063
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by naf View Post
Wow .. nice build Bli John,
Are those red elcos is elna cerafine?
yes they are got it from Mr Daniel

Quote:
Originally Posted by shaan View Post
Hi John.

200mV on 10R will indicate 20mA instead of 200mA. Is the resistor really a 10R or 1R? Or is the meter showing a dot in the reading? Like '20.0'.
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Originally Posted by JOHN BALI View Post
I'm re-read again and found my total current is around 200mA
(200mV on 1R resistor you suggest)
I Vas 16mA
Fet Current almost 180mA with that 470 ohm resistor
Rail is +/- 33VDC before 1R safety resistor
Oops sorry

Quote:
Originally Posted by shaan View Post
SUPERKEEWOOT.

John, it'll be healthy for us if you finish it fast. Hard to wait.
Ok, by your request I'll do it faster as I can

Quote:
Originally Posted by PMI View Post
Total quiescent Current: 130mA~150mA, including VAS current.
(from notes, depending on how the bias is set, and DC rail variation)
...
I can adjust the AC voltage roughly, +/- 1~2V using a Variac (not exactly, I am using a monster of a Superior-Electric Variac bought for scrap prices on ebay). The DC volatage can be adjusted within +/-0.1 thanks to my power supply from MrEvil's thread, but it does drift w. temps.
I just remember that my father have one big variac too, I will use it hehe
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Old 25th August 2013, 06:08 PM   #1064
ivanlukic is offline ivanlukic  Serbia
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Thanks PMI,

That's what I wanted to know.
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Old 25th August 2013, 06:56 PM   #1065
PMI is offline PMI  United States
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@John:
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Old 25th August 2013, 07:36 PM   #1066
shaan is offline shaan  India
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John's PeeCeeBee's got something special about it... I dunno wot but looks like it's made of edible sweet solids LOL...

Lookin' forward.
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Old 26th August 2013, 03:37 AM   #1067
masood is offline masood  India
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Quote:
Originally Posted by shaan View Post
John's PeeCeeBee's got something special about it... I dunno wot but looks like it's made of edible sweet solids LOL...

Lookin' forward.
thanks shan
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Old 26th August 2013, 04:23 PM   #1068
shaan is offline shaan  India
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I was wondering if it's me or someone else whose dual FET boards are gonna be shown here first.

Better make it before September comes coz I'm gonna get myself a bunch of them by then... hohoho....

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Old 27th August 2013, 06:32 PM   #1069
JOHN BALI is offline JOHN BALI  Indonesia
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So here we go...
I will try it tomorrow, no comp. caps & no zobel (not yet)
because I use BD139-140
I hope the test is OK, then I can compare it to his older brother
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Old 27th August 2013, 09:00 PM   #1070
shaan is offline shaan  India
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Originally Posted by JOHN BALI View Post
So here we go...


Seems you're gonna be the first one with the double barreled gun...

Quote:
no comp. caps & no zobel
I hope you are using 2K2/100R feedback network. If 1K/47R is used then the amp may oscillate without some bandlimiting.

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