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Class D Switching Power Amplifiers and Power D/A conversion

Hypex UCD180 HxR. No sound.
Hypex UCD180 HxR. No sound.
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Old 10th August 2018, 10:36 AM   #1
stenak is offline stenak  Norway
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Default Hypex UCD180 HxR. No sound.

I bought a pair of UCD180 HxR version from a guy who never had the time to build an amp. I use a transformer with 2 x 32v windings on each channel, and two 4700microF Rifa phe 169 on each channel. I connected the signalwires to a rca connection, like my drawing tells me. Connected the amp to my preamp...and there was no hiss, no hum, and no sound from my speakers!! Got about +/- 45 volts to each of the modules.
Whats wrong?
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Old 10th August 2018, 11:34 AM   #2
pierrepierrepierre is offline pierrepierrepierre
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+/- 45 and 4700uF are indeed the recommended voltage & capacitance values.


Have you checked if any voltage is present on pin 1 on J4 ? Applying DC voltage to this pin will put the amplifier in standby. Standby logic levels are: high>=3,3 V and low<=0,8 V
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Old 10th August 2018, 01:37 PM   #3
kenta16807 is offline kenta16807  Sweden
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Quote:
Originally Posted by pierrepierrepierre View Post
...pin 1 on J4 ? Applying DC voltage to this pin will put the amplifier in standby. Standby logic levels are: high>=3,3 V and low<=0,8 V
Has this changed on the later revisions

On my old modules (ucd180HG V2) it's pin 4 and it needs to be pulled low for the module to start:
Hypex UCD180 HxR. No sound.-screenshot_20180810_153015-jpeg

I just measured a few mV on pin 4 on one of my modules with the blue led on.
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File Type: jpeg Screenshot_20180810_153015.jpeg (137.1 KB, 181 views)
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Old 10th August 2018, 01:59 PM   #4
kenta16807 is offline kenta16807  Sweden
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...just checked, enable pin has indeed changed

stenak, please check which version you have - it's printed on the PCB
Hypex UCD180 HxR. No sound.-hypex_silkscreen-jpg

Enable pin is internal pull-up to 12V, recommended is an open-collector to GND - but I guess a small signal diode to GND will do/ or simply a bit of wire...
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File Type: jpg Hypex_silkscreen.jpg (435.5 KB, 170 views)
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Old 10th August 2018, 03:16 PM   #5
stenak is offline stenak  Norway
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Default Ucd 180"dead"

Have not done any checking of voltage etc, but it is +/- 45v on the modules. The red LEDs are shining..Here are some photos. Do not know how you can see what kind of ucd 180 this are?
Attached Images
File Type: jpg ucd 1.jpg (216.2 KB, 80 views)
File Type: jpg ucd 2.jpg (249.3 KB, 19 views)
File Type: jpg ucd 3.jpg (264.7 KB, 23 views)
File Type: jpg ucd 4.jpg (359.0 KB, 25 views)
File Type: jpg ucd 5.jpg (205.1 KB, 23 views)
File Type: jpg ucd 6.jpg (235.6 KB, 19 views)
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Old 10th August 2018, 03:38 PM   #6
kenta16807 is offline kenta16807  Sweden
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Nevermind, you have the original 'manual'.

If you look at the 'manual' you see a switch from pin 4 to GND, this turns the amp ON.

In your picture you have nothing connected on pin 4, it's internally connected to 12V (with a resistor) keeping the amp OFF...

At least that's my interpretation....
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Old 10th August 2018, 03:42 PM   #7
stenak is offline stenak  Norway
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Thank You ! I will have a look later this evening.
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Old 10th August 2018, 03:44 PM   #8
kenta16807 is offline kenta16807  Sweden
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I'm useless at explaining things...

Try this:
Hypex UCD180 HxR. No sound.-ucd-2-jpg

***whoops, posted at the same time****
Attached Images
File Type: jpg ucd 2.jpg (251.1 KB, 91 views)

Last edited by kenta16807; 10th August 2018 at 03:45 PM. Reason: Posted at the same time as OP
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Old 10th August 2018, 03:48 PM   #9
Davey is offline Davey  United States
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It doesn't appear you have anything connected to (the enable) Pin 4.
As mentioned by other posters, it won't work like that. You need to pull that pin to ground to enable the modules.

Dave.
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Old 10th August 2018, 06:54 PM   #10
stenak is offline stenak  Norway
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Thanks to Kenta 16807 and Davey, and all the others on the forum. It is a great forum for us builders. You find ideas, good help. I think I have to stop building amps, preamps(most tubepre), rebuilding turntables, because I have no more space left... I will find a wire and connect the wire to these connections.
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