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Void Basys interesting fault |
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cravings 
Old Croc 
Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7442 |
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 Posted: 15 April 2014 at 1:02pm |
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is that a relay clicking that can be heard in the video? it's reminding me of the void kryo (also ram) amp i have here that went blinky mid gig at new years and hasn't done it again since...
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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Posted: 15 April 2014 at 5:38pm |
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No it's the fans trying to start up. They rock backwards and forward when the amp is very cold but kick in after a few minutes use.
This isn't a RAM, it has the same front panel but is very, very chinese. |
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Kevin
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digitallake
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Joined: 04 July 2009 Location: Cornwall, UK Status: Offline Points: 56 |
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Posted: 15 April 2014 at 11:09pm |
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If they're both the power-on LEDs then it looks like the designer has placed them incorrectly in parallel with each other, sharing the same current limiting resistor. In theory that could cause oscillation because the IV curve is a function of the LED's junction temperature.
Let me know if I get an easter egg ;-) |
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kedwardsleisure
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Posted: 16 April 2014 at 11:54pm |
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Go on then Jim, have a little one.
Yes the LEDs are in parallel with a common resistor. But they also have a small capacitor across them.. They shouldn't actually flash, what's happened is the leds have semi-burned out and they only light when the cap has charged up, whenupon the led turns on and the cap discharges again. Fitting two new LEDs has fixed that problem. Now onto the real fault... 
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Kevin
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digitallake
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Posted: 17 April 2014 at 2:00am |
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aww... so close! Thanks for the egg :-D
Yes placing LEDs in parallel isn't a great idea, may go as far as to say it's incorrect design...I've seen odd things happen before when that's done which is why I guessed. I thought actually afterwards that there was perhaps another reason, because the temperature change wouldn't be enough on its own to produce a slow oscillation! Good luck with the repair. I've done quite a few Void amps ... |
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kedwardsleisure
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Posted: 17 April 2014 at 9:01am |
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Done & dusted
leds probably the only bit of the amp the chinese didnt copy off someone else |
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Kevin
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digitallake
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Posted: 18 April 2014 at 9:35pm |
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haha, yes probably. They're very awful.
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