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Class D Switching Power Amplifiers and Power D/A conversion

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Old 19th July 2007, 03:17 PM   #11
ark is offline ark  United States
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this is so interesting.

thanks.

so pano said that this is simple first order high pass.

would changing the cap here be the same as putting a xover between the amp and speaker?

for example i need one to drive a horn 106db efficient 8 ohms and need a first order highpass

could i do this with only the input cap?

provided my pre-amp provided a fixed 600ohm input signal?

also still wondering that the ideal type of cap would be... if the vitamin q caps i have would be as good as other paper in oils?

thanks!
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Old 19th July 2007, 03:29 PM   #12
AndrewT is offline AndrewT  Scotland
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Hi,
if you can arrange for a lower source impedance than 600ohms then go for that.
Many pre-amps have Rs between 50r and 200r.
No idea about vitamin q.
Paper in oil, do they pass (leak) DC eventually?
You could try polypropylene (pp), polyester (pes), or if your budget is limitless teflon.
Don't even bother with any of the ceramics or mica for a coupling cap.

If your horn performs well with only a single pole high pass filter, then yes, a passive filter before the amp will work just as well as an active filter. This is a Butterworth roll-off with Q=0.71. It is not adjustable. But take care to ensure your tolerances give what you think you are building.

What happens to your horn if the amp sends DC to it?
Will it survive switch or off surges when there is no filter between amp and driver.
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Old 19th July 2007, 04:04 PM   #13
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If you want a flexible solution to all your level differences, balance, remote control, save/load of settings for your DCX output, see my '6-channel level control update' on my website.

Jan Didden
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Old 19th July 2007, 05:57 PM   #14
ark is offline ark  United States
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Jann.. already following your project closely and reading the threads on the yahoo group.
: )

Keep wondering if its significantly different than the selectronix kit though ?
link

Anyhow.. I have all the parts to try something now with 3 stereo pots a dcx, three charlize amps and a pile of vintage paper in oil caps..

will try this first..

thanks everyone for an interesting and educational discussion. .wil post my findings when i can.
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Old 19th July 2007, 09:02 PM   #15
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Quote:
Originally posted by ark
[snip]Keep wondering if its significantly different than the selectronix kit though ?[snip]

As different as can be.

Set different levels for low, mid, high freq. bands to compensate for speaker driver and power amp sensitivity differences.

Set balance for whole system without changing relative levels for low, mid, high.

Save/load complete setups in three memory 'profiles'.

Adjust analog input levels if you want to use that.

Front panel A/N display to see at a glance all relative levels and balance and to select functions from a menu.

"Factory default" setting to get you out of a situation where you loose track of what is set to what.

MUTE and On/Off function.

All functions full remote control.

It's a different philosophy, more user oriented I would say. More info on my website. And my unit is specifically designed to fit in the DCX2496 without modifications to the DSP board etc, using a new flat cable set only.

But maybe I should also make a stand-alone version..?

Jan Didden
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Old 19th July 2007, 09:22 PM   #16
ark is offline ark  United States
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: )

thanks Jann,
i had been seeing the discussion but was cloudy on the details..
very nice.. inboard is terrific.
will post further questions to that thread as they arise.
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Old 17th August 2007, 02:44 PM   #17
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Hi all,

For those people interested in my 6-channel level control mod, I have put together a User Guide and a Construction Guide (to be completed). There is also a picture of the replacement flat cables. You can find both in the 6-channel area on my website.

Jan Didden
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