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Old 2nd July 2014, 11:45 AM   #1151
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Does a BOM already exist at one of the electronic suppliers that I can use. Trying to import but running into issues!! If so what is it titled and how to access?
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Old 5th August 2014, 06:08 PM   #1152
rohot01 is offline rohot01  Taiwan
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I'm finish it. The sound is good.
I have a question.
The R4 value is 5 ohm in circuit.
But it is 4.7ohm in BOM.
Which one is right?
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Old 6th August 2014, 10:55 AM   #1153
AndrewT is offline AndrewT  Scotland
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R4 is the Signal Ground to Power Ground reference connection.
The tolerance is unimportant.

Use can use a 4r7 +-20%, or a 5r +-20% part here.
You may well find that any value from 2r2 to 10r will not change the performance of the amplifier in any measurable way.
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Last edited by AndrewT; 6th August 2014 at 11:01 AM.
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Old 6th August 2014, 04:30 PM   #1154
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Another option, especially applicable if larger resistor values are used. . .
Quote:
Originally Posted by danielwritesbac View Post
Is it okay to put a little cap in parallel with the 10R groundlift, say about 100n for treble bypass?
Quote:
Originally Posted by ostripper View Post
yes , that is a good idea. I used a bypass across the 10R to mitigate PC power supply noise in an earlier amp project . A .1uf multilayer ceramic was used.
OS
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Old 10th August 2014, 01:35 AM   #1155
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Ok I have finished boards and am testing now. should I be concerned with unequal currents through outputs without any heatsinking at all? I'm assuming not but one board looks very balanced under same conditions. only running output at 10ma bias.
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Old 10th August 2014, 01:38 AM   #1156
AJT is offline AJT  Philippines
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yes, better install the heatsinks first...
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Old 10th August 2014, 02:05 AM   #1157
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Quote:
Originally Posted by Freecrowder View Post
Ok I have finished boards and am testing now. should I be concerned with unequal currents through outputs without any heatsinking at all? I'm assuming not but one board looks very balanced under same conditions. only running output at 10ma bias.
You can blow an output is seconds without a heatsink attached. Don't do it.
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Old 10th August 2014, 04:03 PM   #1158
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OK I'll install sink before doing anything more. what is the purpose of R53and 54, the 22 ohm resistors to each rail. looks like they would only come into play if fuses go out.
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Old 10th August 2014, 05:38 PM   #1159
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Quote:
Originally Posted by Freecrowder View Post
OK I'll install sink before doing anything more. what is the purpose of R53and 54, the 22 ohm resistors to each rail. looks like they would only come into play if fuses go out.
Yes, OS calls them safety resistors. I call them board burners. I would leave a space between them and the board is you use them. If the fuse blows, they will probably burn as well, mine did.
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Old 11th August 2014, 08:25 AM   #1160
AndrewT is offline AndrewT  Scotland
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They act as very slow fuses, that allow the rest of the circuit to blow up when another fault occurs and/or one abuses the amplifier.
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