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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th October 2005, 05:31 PM   #21
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Hello All,

Hope you don't mind a new member jumping in to the conversation. I also have one of Yeo's Charlize amps assembled about a week now and am also experiencing the turn-on pop. I tried Yeo's mute switch fix but it made no difference. I asked Yeo about the pop and he said some systems exhibit the problem and others don't, he suggested wiring a switch to the speakers. Otherwise Charlize sounds very good, an authoritative bottom end, a warm yet still detailed midrange (how'd Yeo do that?), and a 3-Dimensional quality that sounds live are what stand out for me. Below are a couple pics of my Charlize.

Dave

http://tinyurl.com/buovu
http://tinyurl.com/dy7zn
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Old 12th October 2005, 05:31 PM   #22
dede is offline dede  France
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Thx for the answers,

After mesureament, my power supply is a bit low. I have 11.7v with, from the datasheet 28A at max.

I hope the mute fonction because i will use them with high efficiency speakers who will not enjoy a plop

rgds
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Old 12th October 2005, 05:40 PM   #23
Nuuk is offline Nuuk  United Kingdom
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Quote:
Below are a couple pics of my Charlize.
She looks very lonely in that big space Gordon! But there is room for Monica as well!

Quote:
I hope the mute fonction because i will use them with high efficiency speakers who will not enjoy a plop
I know what you mean Dede, I don't even have a crossover between the Charlize and my Goodmans 201's! I may have to get out the Velleman speaker protection modules!
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Old 12th October 2005, 07:09 PM   #24
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Originally posted by Nuuk
The circuit that I posted earlier in this thread should work well too!
In this thread ? I'm getting hold as I don't see it
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Old 12th October 2005, 07:14 PM   #25
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Quote:
Originally posted by ashok1


This time delay kit looks like a possibility. It appears that the output relay can be configured to turn on after a preset delay and stay on as long as power is applied. So, un-mute the Charlize after say 5 seconds after power is applied.

http://www.electronics123.com/s.nl/s...it.A/id.386/.f
I'm not sure that it will help. What it need is a soft start that slowly increase the voltage. The mute have no effect on the voltage you send to the amp.... Am I wrong ??

It look like we are a few persons to need a soft start module, why not try to find someone from who we could buy a kit. I wonder if DIYPARADISE could be interested to providing us a kit ??

Anyone interested ?
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Old 12th October 2005, 08:54 PM   #26
Nuuk is offline Nuuk  United Kingdom
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Quote:
In this thread ? I'm getting hold as I don't see it
I can't remember where I post things these days! This is one that I was referring to.


Click the image to open in full size.

More details here .

I'm not sure why that mute function doesn't work on the Charlize!
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Old 13th October 2005, 01:33 AM   #27
BWRX is offline BWRX  United States
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is it the mute or the sleep function? which pin on the chip is the switch connected to? if you install a switch for the sleep/awake function you still hear a small pop when waking the amp up. although not as loud as having the amp awake and then turning the power supply on.
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Old 13th October 2005, 03:32 AM   #28
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hi guys

glad you guys love charlize.

a business partner is working on a switching power supply with soft start feature but he had some problems with the module. hence the delay.

will definitely let you guys know when it's ready.

donjuan
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Old 13th October 2005, 10:19 AM   #29
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Quote:
Originally posted by DonJuan
hi guys

glad you guys love charlize.

a business partner is working on a switching power supply with soft start feature but he had some problems with the module. hence the delay.

will definitely let you guys know when it's ready.

donjuan

Great news !

Thanks for listening to your customers !
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Old 13th October 2005, 11:39 AM   #30
Mick_F is offline Mick_F  Germany
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I have a very effective way to solve the start-up problem: I just leave the amp on all the time.

Seriously, I think placing a switch between speakers and output is a good solution.

Mick
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