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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd November 2005, 09:19 PM   #81
Pano is offline Pano  United States
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Quote:
Originally posted by Nuuk
If your sources will all work into 10K, that will be fine.
Right! (most preamps can handle this, no problem, but not all sources can)

Quote:
don't fancy using two volume controls again!
Double right!! You could, but why.....? You'll hate yourself in the morning.
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Old 30th March 2008, 03:14 PM   #82
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I know I'm years late for this thread ...

... but this was my simple solution to the Charlize turn-on pop - leaving just a simple switch. I use a SMPS, this would probably not be good for batteries.

Just wire a 280ohm resistor across the switch output poles. (It is listed as an option on Yeo's site.)

This means that OFF is actually a low-current stand-by-mode. then ON gives the full 12 volts with only a faint click from the speakers. (96db/watt Full rangers).

Perhaps not as green as the three-way rotary solution, but you kind of expect a simple on-off switch on an amp.

I'll be recasing mine soon (to add multiple inputs) and will probably go for a power on/off switch at the back, then the standby/on switch (as above) at the front.
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Old 30th March 2008, 05:33 PM   #83
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Alan, another 'soft-start' solution is shown here .
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Old 30th March 2008, 09:51 PM   #84
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Quote:
Originally posted by Nuuk
Alan, another 'soft-start' solution is shown here .
Thanks Nuuk. The delay circuit sounds cool - but adds cost, and (for me) complexity.

I'm reconsidering my options - perhaps a three position is not so odd as I first thought, particularly if labelled OFF - STANDBY - ON

I'm using the stock capacitors so not a huge thump anyway.
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Old 31st March 2008, 07:48 AM   #85
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Quote:
Originally posted by Nuuk
Alan, another 'soft-start' solution is shown here .
And very effective and CHEAP!
It's even cheap if you get the bits from Maplin.... and you no longer have to worry about someone else switching your amp on.
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Old 31st March 2008, 02:13 PM   #86
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Quote:
Originally posted by Lostcause


And very effective and CHEAP!
It's even cheap if you get the bits from Maplin.... and you no longer have to worry about someone else switching your amp on.
Checked Maplins - the components are cheaper than I expected!

Is the following Maplins Automotive relay suitable?

Maplins Automotive Relay 40A

Alan
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Old 31st March 2008, 05:39 PM   #87
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Hi Alan, I'm pretty sure that I used the JM67X which is a single throw version. That's all I really needed.
And of course the wattage doesn't need to be that high for these amps.
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Old 14th August 2008, 09:14 PM   #88
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Impedence matters ...

Just took delivery of a new toy - a Promitheus Transformer Volume Control. This is now between my source (Quad 77) and the Charlize.

Very impressed ... just trying to work out what this has done to the sound.

1. Definite loss of some midrange clutter. Nice.
2. Top end sounds just as extended, but slightly sweeter with no dullness.
3. Overall increase in weight - particularly at low to mid listening volumes.
4. No downsides I've noticed ... yet (only about 4 hours listening).

This is a keeper. Not cheap for a volume control with 4 inputs - but this has lived up to its hype.

The change is not just bypassing the pot (an Alps blue), because it is currently burning in at full volume, with the Alps pot providing the volume control - and the difference is obvious.

So I presume that it is the impedence matching - providing a high impedence to the CDP (which apparently they like) and a low one to the Amp (ditto). Rather than the impedence compromise when a simple pot is used.

If it was nicked I would buy it again in a flash!
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