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Old 23rd April 2010, 01:26 PM   #151
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I hope that nobody go to build this amp as his first amp ever. Some expirience is welcome, and can help with first powered.
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Old 23rd April 2010, 02:36 PM   #152
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by AndrewT View Post
that's where we fundamentally disagree.
I will not plug in speakers to an untested amplifier.
I will not remove the input shorting link until I know that all the operating quiescent currents are as expected.
I will not set the quiescent output stage current (bias) with the output loaded nor with the input shorting link removed nor when the PSU voltage is below the normal operating voltage, i.e no bulb tester in the primary feed.

With a light bulb in place, you can't hurt the speaker - no matter what you did wrong. Even if the amp rails. On the first no-bulb test the speaker is hooked up through a resistor with the brunt of it going to a dummy load. Again, if there is smoke there's no speaker damage.

Making sure I have proper quiescent current control is a normal part of the initial checkout. With the limiter you will not be able to set it properly, but you should check for control. Then I'll back it off to right at class B before switching to a non-limiter test. You may prefer backing it off as far as the pot will go.
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Old 23rd April 2010, 03:05 PM   #153
wg_ski is offline wg_ski  United States
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There is no bias adjust on this circuit.
Trim R23. Even if you didn't build it that way, I would.
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Old 23rd April 2010, 03:41 PM   #154
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Trim R23. Even if you didn't build it that way, I would.
Yes, I always say, who know to make upgrades is free to do that. In other case don't change anything.
Regards
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Old 23rd April 2010, 10:16 PM   #155
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thanks guys
the amp is working well
two days of testing no overheating
very good sounding amp
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Old 24th April 2010, 02:20 AM   #156
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If you like sound of B500, but is to much powerfull for Hi-Fi, consider about this 50W amp.
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if this have pcb i will try
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Old 24th April 2010, 07:32 AM   #157
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Originally Posted by engel dela pena View Post
if this have pcb i will try
This amp B50 not have final version of pcb. If you want to try amp about 100w you can find several in my threads.
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Old 24th April 2010, 08:10 AM   #158
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Originally Posted by engel dela pena View Post
thanks guys
the amp is working well
two days of testing no overheating
very good sounding amp
And what's about power?
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Old 24th April 2010, 11:38 AM   #159
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And what's about power?
very powerful amp
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Old 24th April 2010, 01:20 PM   #160
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Originally Posted by engel dela pena View Post
very powerful amp
PA amplifier with Hi-Fi sound as I say.
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