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Cheap Balanced Power Amplifier - Chip or Class D

Thanks Pete, I've taken a look. Are these the ones ?

JST VHR-3N 3 Pole Housing VH Series P3.96 mm
Code: 22-5272

ST VHR-2N 2 Pole Housing VH Series P3.96 mm
Code: 22-5270

JST BVH-21T-P1.1 Loose Contact For VH Series
Code: 22-5306
 
JST BVH-21T-P1.1 Loose Contact For VH Series
Order code: 22-5306

JST VHR-3N 3 Pole Housing VH Series P3.96 mm
Order code: 22-5272

JST BXH-001T-P0.6 Loose Contact XH Series
Order code: 22-5374

JST PHR-4 4 Pole Housing PH Series P2.00mm
Order code: 22-5244

JST VHR-2N 2 Pole Housing VH Series P3.96 mm
Order code: 22-5270

JST BPH-002T-P0.5S Loose Contact For PH Series
Order code: 22-5254


Is what I ordered, I used a 4 pole connector for the signal in.

Pete
 
That transformer should defo go to a star earth not the bolt that attaches it to the case.
 
Pete MB&D said:
JST BVH-21T-P1.1 Loose Contact For VH Series
Order code: 22-5306

JST VHR-3N 3 Pole Housing VH Series P3.96 mm
Order code: 22-5272

JST BXH-001T-P0.6 Loose Contact XH Series
Order code: 22-5374

JST PHR-4 4 Pole Housing PH Series P2.00mm
Order code: 22-5244

JST VHR-2N 2 Pole Housing VH Series P3.96 mm
Order code: 22-5270

JST BPH-002T-P0.5S Loose Contact For PH Series
Order code: 22-5254


Is what I ordered, I used a 4 pole connector for the signal in.

Pete
Click to expand...

Thanks Pete, I've ordered the PH pre-made ones from an ebay seller and the larger VH type from Rapid.
 
Pete MB&D said:
My Ice power module in a Cisco DMP case, we chucked out lots of these so I grabbed a couple and found a Transcend 4gb 266X Compact flash card inside, that in the camera now!

B&O ice power by Pete Maddex, on Flickr

Pete
Click to expand...
Looking a bit fuller now...

B&O ICEPower by Pete Maddex, on Flickr

I had a hum/noise problem on which ever channel the PSU was plugged into, it turned out that all the holes in the single ended to balanced board after I tool the terminal blocks aren't all connected and I wasn't getting an 0v on one output.

Pete
 
Looking good
the small green caps on the drv134 board are they nichicon non polarised ?
if so they should be polarised caps as they sit on the power rails
i made the same mistake with mine
just finished another power amp
20180112_124502 by glenn jarrett, on Flickr
20180110_095141 by glenn jarrett, on Flickr
20180111_145507 by glenn jarrett, on Flickr
20180111_152442 by glenn jarrett, on Flickr

39638091792_dcf7db333d_k.jpg
20180112_124502[/url] by glenn jarrett, on Flickr[/IMG]
 
I didn’t look closely at the caps I have it running into my Arcs at the moment, I am going to leave it running for a week or so then put the Hackernaps back in.
I wil give it a once over then.

Did you spot the VBE before the regs?

Pete
 
I was wondering what the transistors were for ( like on the B4 buffer )is it some sort of a soft start ?
i used a relay to pull down the enable pin (pin 7 ) the relay open after 5 seconds on power up stopping any pops ;)
 
What do you think of the sound ?
i called round to a friends house i sold a ncc200 voyager clone i built to with my power amp and did a comparison using his ryan sound labs preamp naim sbl's and a naim cd (not sure which model ) after a afternoon of listening we both preferred the ice amp :eek:
Glenn
 
glenn jarrett said:
I was wondering what the transistors were for ( like on the B4 buffer )is it some sort of a soft start ?
i used a relay to pull down the enable pin (pin 7 ) the relay open after 5 seconds on power up stopping any pops ;)
Click to expand...
Just an a amplifiered capacitor to filter any crap from the onboard supply.
A transistor with a 10K from collector to base and a 10uF to ground.

Pete
 
Well I ran it for a few weeks and on Sunday put back my Hackernaps, wow what a difference the bass is back to playing tunes, it was a bit one note with the ICE modules.
I don't think I will go back.
Pete
 
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