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Aleph 5 based on BrianGT boards
Aleph 5 based on BrianGT boards
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Old 8th November 2018, 11:03 PM   #11
Nohabla is offline Nohabla  Norway
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Hi, Yes the TBD: R12 is 453r, R13 is 221k and R17 is 75r. R6 is optional, for closer matching of Q1 and Q2. I have left it out.

I will try your tip about 1k pot at R18, starting at 0 ohm.
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Old 8th November 2018, 11:56 PM   #12
Nohabla is offline Nohabla  Norway
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Hmm, well it's like the amp readjust it self when i get past 3,3v across R18, no matter how much i turn the pot after i get past 3,3v it will not increase for more than a secound or so. The magic point looks to be 142 ohm at R18.
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Old 9th November 2018, 12:30 AM   #13
Zen Mod is offline Zen Mod  Serbia
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Aleph 5 based on BrianGT boards
inputs shorted , no load , while setting
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Old 9th November 2018, 01:32 AM   #14
Bfpca is offline Bfpca  Canada
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Aleph 5 based on BrianGT boards
Could Q4 be conducting and preventing the voltage from going higher? Check Q4 orientation to make sure it’s the correct pin out. Also check Vbe to see if it’s conducting.
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Old 9th November 2018, 11:42 PM   #15
Nohabla is offline Nohabla  Norway
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Quote:
Originally Posted by Zen Mod View Post
inputs shorted , no load , while setting
Hi, have tried both shorted and not, theres no difference, the amp acts the same. Also no load on spk output.
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Old 9th November 2018, 11:51 PM   #16
Nohabla is offline Nohabla  Norway
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Quote:
Originally Posted by Bfpca View Post
Could Q4 be conducting and preventing the voltage from going higher? Check Q4 orientation to make sure itís the correct pin out. Also check Vbe to see if itís conducting.
Hi, yes i'm starting to suspect that. Q4 arrangement is some kind of limiter/protection circuit? Bussy at home to day, havn't had time to look at this, will try to morrow.
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Old 9th November 2018, 11:52 PM   #17
Zen Mod is offline Zen Mod  Serbia
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Aleph 5 based on BrianGT boards
take a look in also active Aleph 5 thread

my posts about trimpots

remove Q4
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