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100W Ultimate Fidelity Amplifier
100W Ultimate Fidelity Amplifier
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Old 5th July 2019, 08:18 AM   #11431
Astaro is offline Astaro  Russian Federation
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ChrisMmm С9, с10 change on 22-33pf. R20 change оn 50R. Sound will be better.
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Old 5th July 2019, 11:28 AM   #11432
hassan4119 is offline hassan4119  Iran
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Quote:
Originally Posted by bullittstang View Post
This 150r to 470r stopped the power-on noise? To clarify, you changed R9 from this schematic/board layout? I am having similar issue, but negative DC for about 1-2 secs, pulls the woofer in. Hardly any real noise, but if I can avoid I would like to.
i can not kill popup noise.but when replace 150R/R9 with 330R or 370R mje350 and 2n5551's dont be hot....and circuit be stabl.but with 470R sound be very bad...because drivers can't work properly.you use 330R.
i dont know that how kill popup noice...mr mile just can help us.mr mile if you hear me heeeeeeellllpppp us please.

Last edited by hassan4119; 5th July 2019 at 11:34 AM.
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Old 5th July 2019, 06:33 PM   #11433
MilanAudio is offline MilanAudio  Czech Republic
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So I decided to go also with APEX AX14

100W Ultimate Fidelity Amplifier

I have just two questions:

1) Where is the latest APEX AX14 PCB layout please?
2) What should be the bias on which resistor I should check mV?

So many posts here, I got totally lost...

And thanks for help!
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Old 5th July 2019, 07:46 PM   #11434
AdeS is offline AdeS  Brazil
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Prasi have shared gerbers here.
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Old 5th July 2019, 08:38 PM   #11435
MilanAudio is offline MilanAudio  Czech Republic
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Quote:
Originally Posted by AdeS View Post
Prasi have shared gerbers here.
Amazing! Over 1100 pages and you knows! Thanks!
And do you know where I should check mV for bias (or what is it)?
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Old 5th July 2019, 08:51 PM   #11436
bullittstang is offline bullittstang  United States
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100W Ultimate Fidelity Amplifier
Quote:
Originally Posted by MilanAudio View Post
Amazing! Over 1100 pages and you knows! Thanks!

And do you know where I should check mV for bias (or what is it)?


Measure across the 0r33 resistor and youíre looking for ~10mV, which should get you close to 30mA on the outputs. Thatís my figure, other may suggest higher or lower, but that a safe bias voltage.
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Old 5th July 2019, 09:42 PM   #11437
ChrisMmm is offline ChrisMmm  New Zealand
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Quote:
Originally Posted by prasi View Post
Yes, the amp is good to go. Few have it built and using. I haven't built it yet, but plan to.
30-0-30 , 300VA is good for 100W at 8 ohm.
Thanks prasi, will get ordering now.

MilanAudio, I ordered AX14 boards from PCBway and ended up with too many. If you would like I can send you a pair, no cost. PM me.
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Old 6th July 2019, 04:49 AM   #11438
ChrisMmm is offline ChrisMmm  New Zealand
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All my spare AX14 boards have been taken now. That was quick!
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Old 6th July 2019, 10:16 AM   #11439
anoopkrajan is offline anoopkrajan  India
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Default AX14 minimum voltage

Quote:
Originally Posted by apexaudio View Post
AX14 will work with +/-38V on 4ohms load without any changes.
Regards
What is the minimum voltage with which AX14 would work fine ?
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Old 6th July 2019, 05:22 PM   #11440
lomdwrrrt is offline lomdwrrrt
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Lord mile could show scheme dc6 protection
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