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Old 24th January 2012, 07:22 PM   #881
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Yes Bimmer, it's a stereo unit. Since I was building a dual-mono amp, I was worried about the share of this component by the two channels. The cross-channel talk due to this component is negligible.

A.Wayne, my Hx amp has a power-on thump. It also has a power-off delay due to the DC voltage that depletes progressively as the caps discharge. When the speakers are directly connected to the boards, I can have music for as long as 30 seconds after disconnecting the unit, just because of the voltage reservoirs, or just a few seconds when it's playing louder...

Many high-ends or high-power power-amps have this kind of circuitry, either with electro-mechanical components (relays) or by other solid-state means.

This circuit may have saved my speakers already, I explain: I was connecting / disconnecting my speakers while music was playing (rather loud), and guess what? I briefly shorted the amp output without noticing. It blew only ONE of the on-board fuses, thus only throwing the negative portion of the sine-wave to the speaker. This protection crcuit instantly disconnected both speaker outputs, preventing any damage to the speakers themselves. After replacing the blown fuse, everything was back to normal.

Nota: I don't make any money by suggesting this (hahaha)
Martin.
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Old 24th January 2012, 08:28 PM   #882
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Quote:
Originally Posted by canonnica View Post
my Hx amp has a power-on thump. It also has a power-off delay due to the DC voltage that depletes progressively as the caps discharge. When the speakers are directly connected to the boards, I can have music for as long as 30 seconds after disconnecting the unit, just because of the voltage reservoirs, or just a few seconds when it's playing louder...
My DX Blame does the same thing. A power-on thump, and a "burp" after a long delay after power-off. Maybe I should get me one of those protection circuits too.
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Old 24th January 2012, 09:35 PM   #883
a.wayne is offline a.wayne  United States
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Power on thump may be normal in most amps , not so on turn off..

I have /had many amps over the years and most not all exhibited some kind of on thump, all barely obtrusive, never had one make noise on turn off and non had speaker relays.
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Old 26th January 2012, 02:47 PM   #884
BMW850 is offline BMW850  Netherlands
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Now I have the 2nd board also ready.
The wait is now on the postman, he must deliver 2 x MJE 15030

The light is not good, therefore the photos not clear.

Regards,
Rudy
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File Type: jpg 20120126_163103.jpg (277.8 KB, 293 views)
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Old 26th January 2012, 02:51 PM   #885
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Rudi,

the postman is on his way - as fast as he can.
Do not forget the lift-off resistor on the 2nd board.

Best regards - Rudi
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Old 26th January 2012, 02:59 PM   #886
BMW850 is offline BMW850  Netherlands
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I will certainly not forget
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Old 26th January 2012, 03:23 PM   #887
BMW850 is offline BMW850  Netherlands
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What do you all think of these Speaker Protection Modules?
Because I have mono-blocks this seems to me a good solution.

2x Mono Speaker Protection Module - each for on Channel:
2x Mono Speaker Protection Module - each for on Channel | eBay

Regards,
Rudy
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Old 26th January 2012, 06:17 PM   #888
AndrewT is offline AndrewT  Scotland
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you only need speaker protection modules AFTER you have completed all your testing.

Then they can be a very good idea.
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Old 26th January 2012, 06:26 PM   #889
BMW850 is offline BMW850  Netherlands
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Yes that was also my intention, but is there difference in these modules and where do I need special attention.

Regards,
Rudy
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Last edited by BMW850; 26th January 2012 at 06:29 PM.
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Old 26th January 2012, 07:19 PM   #890
evette is offline evette  Canada
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What you have learned in the past should be your guide. evette
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