| sumacSK |
Hi all,
Here are pictures of my very first finished amp. It works really great. There is just one thing I don't understand: when I turn it off, few seconds after that it seems to turn on for a short while.
Do anyboy knows why is this?
Thank you all for your help.
Martin |
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| sumacSK |
| and another one... |
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| Russ White |
Wow, thats a nice neat compact implementation. I am not sure I can diagnose your turn off problem, but I will mull it over. :)
Good job, I bet it sounds great. |
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| tja |
| quote: | Originally posted by sumacSK
There is just one thing I don't understand: when I turn it off, few seconds after that it seems to turn on for a short while.
Do anyboy knows why is this?
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I've got the same thing with my (BrianGT) RevA. I switch it off (with the source still running) and the music dies after two seconds, only to come back from the grave after a few seconds, but just for a short while.
Take |
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| sumacSK |
Hi Take,
Yes, this is exactly what my amp is doing... Did you managed to fix it? Or I don't have to worry about it? :hot:
Thanks Martin |
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| tja |
No, haven't fixed it (I'm still in the proces of building the other channel), but I'm not too worried either. I'll be watching this thread to see if anyone has a solution (or just an explanation).
Take |
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| DocLorren |
No solution here, but just to let you know mine does the same thing and is running fine.
Maybe it has something to do with the chip shutting off after the inevitable voltage drop following a few seconds of playing music without power (the length depending on how much uF you have in your PSU), which could somehow recover in the electrolytic caps to give one more (very) short burst of music? |
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| carlosfm |
| quote: | Originally posted by DocLorren
No solution here... |
Try bleeder resistors on the PSU. |
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| DocLorren |
Carlos,
That could very well be the solution although to a problem that I personally do not perceive as a one. Once you decide to stop listening, why not shut down all your equipment?
Or is there someone out there who insists that repeatedly powering up/down a GC is bad for music reproduction :-) |
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| Nordic |
| Without the bleeders, if you switch the amp off regularly the capacitors stays in this neither fully charged or discharged state which is not good for them... |
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| dhenryp |
| It would be interested to put a voltmeter on your power supply when you shut it off. I bet you'll find the transitions happen at the same voltage each time. I bet it because of something like the amplifier chip automatically shuts down when the PS caps get to some low voltage and then at some lower voltage this "protection" circuitry doesn't work and the amp plays on until the the caps drain down further. Bleeder resistors should get you through the cycle quicker but may not fix it. You could also switch the speaker out when you shut power off with a relay on your amp or maybe even extra contacts on your power switch. |
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| carlosfm |
| quote: | Originally posted by DocLorren
Carlos,
That could very well be the solution although to a problem that I personally do not perceive as a one. Once you decide to stop listening, why not shut down all your equipment? |
Huh?
That's exactly what I do. |
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| DocLorren |
Carlos
It was meant as a comment in general.
I for one do not enjoy listening to music coming from an amp that has just been switched off. |
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