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Thunau 1st November 2006 10:40 PM

looking for a single channel class D amp module
As the title suggests, I'm looking for a source of a single channel amp.
I have a Velodyne F1500 sub with a blown up main circuit board. I called Velodyne and there are no more replacement parts for it. They offered to look at it and see if it can be repaired. The estimate over the phone was in the $225.00 range.
I think I can do better by getting something like UCD180 or similar and mounting it on the existing plate - utilizing the existing transformer, fuses, switch, input jacks etc.
What would be a good choice for about 200W-300W mono output?


BWRX 1st November 2006 11:21 PM

We'll see how the TI TAS5261 works soon enough: ;)

What rail voltages are available using the existing transformer?

Thunau 1st November 2006 11:32 PM

The transformer has dual secondaries at +35V/0/-35V.

BWRX 2nd November 2006 12:12 AM

That's 35VDC, correct? Next question: what's the nominal impedance of the sub and what is its sensitivity?

Thunau 2nd November 2006 12:21 AM

No, it's AC output from the transformer. I say +/- because there is 70V difference between them. As to the woofer, I didn't measure it properly yet. I suspect it's an 8 Ohm job because the DC resistance is around 6 Ohm. It also has some kind of second coil for the servo circuit.

BWRX 2nd November 2006 12:26 AM

The UCD180 absolute max supply voltage is 50V, so I wouldn't use it with your transformer. Plus, it would only put out around 100W into an 8ohm load. You'd be better off with a UCD400 or other comparable module. Although that would put you in the same price range as having the current amp repaired.

siricoyi 2nd November 2006 12:55 AM

Daveis 2nd November 2006 01:12 AM

Aren't all the Velodyne's servo subs? Isn't there some sort of accelerometer and feedback loop built into those? I'd be afraid to mess with something like that myself.

Thunau 2nd November 2006 01:33 AM

Yes, most of the Velodynes are servo.
There is a multipin connector going in the box from the amp. If I can't find a real replacement for the amp I will just power the woofer with a generic amp and use EQ to get it to acceptable performance.
I looked into d-class first because of the small space I have inside the amp compartment.

Daveis 2nd November 2006 03:51 AM

Well, the UCD180ST with the matching 160VA transformer and standard grade power supply are about $180 to $200. A 41hz AMP5 tripath would be buildable for less than $225 as well.

I've been very pleased with my UCD's and have been using them with your Frequency Allocator Lite.

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