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Class D Switching Power Amplifiers and Power D/A conversion

My revised UCD180 integrated amp
My revised UCD180 integrated amp
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Old 10th April 2009, 01:53 PM   #1
mr_push_pull is offline mr_push_pull  Europe
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Default My revised UCD180 integrated amp

Hello again everyone,

After spending 3 years with 2 heavy transformers and a crazy wiring layout, my UCD-based amp welcomes a SMPS. I bought it from someone who claimed to have removed it from a Denon receiver. It was defective but I only had to replace a burned diode. I don't know about its power rating but judging from the size of the heatsinks it should be more than enough for my listening levels. I had to cut a few millimeters off the heatsinks so they could fit the slim case (approximately 4 cm of height).

So, basically, here it is:
- front-end module containing input selection circuitry and digital pot (top right)
- control module based on a PIC 16F876, controlling the front end, volume display (the LEDs on the front plate), remote decoding and the "reading" of the volume pot (it is an "endlessly-rotating" Vishay pot connected to the A/D input of the PIC) - middle-right
- IR remote (sensor at the bottom-left)
- 2 transformers, one for the PIC 5V supply and one for the front-end

Still not the nicest looking amp (the face plate was painted with a matte black spray paint that expectedly peeled here and there), and the layout could use some improvement, but I'm happy with it.

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Click the image to open in full size.
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Old 16th April 2009, 09:29 PM   #2
dudaindc is offline dudaindc  United States
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I like it!
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