looking for a single channel class D amp module

Thunau · 1st November 2006, 10:40 PM

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?

TIA

BWRX · 1st November 2006, 11:21 PM

We'll see how the TI TAS5261 works soon enough: Texas Instruments TAS5261

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

http://www.coldamp.com/opencms/openc...html?idioma=en

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.

1st November 2006, 10:40 PM	#1
Thunau diyAudio Member Join Date: Mar 2001 Location: PA USA	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? TIA __________________ "Most people just say what they know, the wise ones know just what to say."

1st November 2006, 11:21 PM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	We'll see how the TI TAS5261 works soon enough: Texas Instruments TAS5261 What rail voltages are available using the existing transformer? __________________ Brian

1st November 2006, 11:32 PM	#3
Thunau diyAudio Member Join Date: Mar 2001 Location: PA USA	The transformer has dual secondaries at +35V/0/-35V. __________________ "Most people just say what they know, the wise ones know just what to say."

2nd November 2006, 12:12 AM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	That's 35VDC, correct? Next question: what's the nominal impedance of the sub and what is its sensitivity? __________________ Brian

2nd November 2006, 12:21 AM	#5
Thunau diyAudio Member Join Date: Mar 2001 Location: PA USA	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. __________________ "Most people just say what they know, the wise ones know just what to say."


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2nd November 2006, 12:26 AM	#6
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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. __________________ Brian

2nd November 2006, 12:55 AM	#7
siricoyi diyAudio Member Join Date: Nov 2006	http://www.coldamp.com/opencms/openc...html?idioma=en

2nd November 2006, 01:12 AM	#8
Daveis diyAudio Member Join Date: Dec 2003 Location: Des Moines, IA	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.

2nd November 2006, 01:33 AM	#9
Thunau diyAudio Member Join Date: Mar 2001 Location: PA USA	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. __________________ "Most people just say what they know, the wise ones know just what to say."

2nd November 2006, 03:51 AM	#10
Daveis diyAudio Member Join Date: Dec 2003 Location: Des Moines, IA	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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