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Chip Amps Amplifiers based on integrated circuits

Best SMPS for Gainclone
Best SMPS for Gainclone
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Old 4th June 2009, 01:00 PM   #11
bcrescen is offline bcrescen  United States
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Thanks guys. So you think it will work well? Is it best to use 2 in series.
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Old 9th June 2009, 12:36 PM   #12
sixtoe is offline sixtoe  United States
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Default Totally new here but...

Isn't this SMPS outputting 2 x 24v? The pics for terminal option -T and molex connector option -J seem to show 2 pair of +/-V rails. The molex connector H-OU-21 shows 3 pair of black/red wires?!?! Am I wrong in reading the pdfs from Cosel?

I just ordered 2 of these to build Peter Daniel's 4780 dual monoblock kit. I just can't afford toroids and components for the PS boards on my fixed income.

I sure hope I am not wrong about the voltage on these or I will have to return em or ebay em. Probably won't hurt since they are usally retailing for over 120 bucks everywhere but bgmicro.

Oh, and HI first post!
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Old 9th June 2009, 12:48 PM   #13
theAnonymous1 is offline theAnonymous1  United States
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Default Re: Totally new here but...

Quote:
Originally posted by sixtoe
Isn't this SMPS outputting 2 x 24v? The pics for terminal option -T and molex connector option -J seem to show 2 pair of +/-V rails. The molex connector H-OU-21 shows 3 pair of black/red wires?!?! Am I wrong in reading the pdfs from Cosel?
It's just two sets of connections to the same single supply, not two independent supplies.
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Old 9th June 2009, 05:36 PM   #14
sixtoe is offline sixtoe  United States
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I don't know what I was thinking. Two of these supplies even at only one 24v rail should work fine for Peter's 4780 kit in the bridged configuration. One supply per channel. The schematic for the psu on that kit shows a single toroid with 2 x 22v secondaries. These supplies could be used for 4 ohm speakers because they have a potentiometer that allows output adjustment. Maybe even down to 18v perhaps.
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Old 9th June 2009, 06:32 PM   #15
sixtoe is offline sixtoe  United States
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I am learning be kind. :/ Ok, 2 of these supplies in series will provide 1 +/- 24v for a single bridged 4780 using a single amp PCB board from Peter's kit. I would need 4 of them to provide dual +/- 24v for 2 4780 bridged chips using both boards from Peter's 4780 kit. Right?
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Old 10th June 2009, 12:24 AM   #16
bichi is offline bichi  United States
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Received two (2) BGMicro Cosel PBA150F, 24vdc @ 6.5amp switching supplies:

BAD NEWS:
- appears to be a modified model, configured for an equipment manufacturer.
- output is NOT floating, with (-) minus internally connected to ground.
- attached quick drawing shows shorts when configured for series, bi-polar +/- 24vdc output.

GOOD NEWS:
- easy to modify, by clipping single wire-link inside the supply. (not a hack, but configuring an option)
- made in Japan, with 105c Nippon Chemicon KZE capacitors.
- forward converter, 120kHz switching freqency with 60~550kHz active filter.
- quick measurements:
PSU 1: Adj Range: 16.36~29.64vdc
PSU 2: Adj Range: 15.83~29.56vdc

NOISE: (+/- 24vdc series configuration 48vdc)
C515:
Jumpered: RMS: 104mV PP: 928mV
2.2nF: RMS: 22mV PP: 120mV
150nF: RMS: 4mV PP: 34mV

Will post detailed procedure, with pictures, on how to isolate (-)minus output from ground, later tonight...
Attached Images
File Type: jpg switching supply-isolated output-003.jpg (87.0 KB, 1166 views)
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Old 10th June 2009, 05:15 AM   #17
sixtoe is offline sixtoe  United States
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Thank you bichi. I'm eager to see your implementation.
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Old 10th June 2009, 05:17 AM   #18
bichi is offline bichi  United States
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BGMicro, Cosel, PBA150F configuration change from grounded (-)minus to "isolated/floating" output:

- remove cover, careful not to force, cover bends easily.
- a bit of jiggling, with "slide catches" releasing with bias away from output side.
- remove single wire jumper, at position C515.

- optional: cut jumper in the middle, leaving "stubs," to solder-in film capacitor.
- 150nF installed, calc'ed from core 125mHz switching frequency. (metalized poly film @ 200vdc, only because I had them)

!Standard lethal voltage caution when working with switching power supplies!

Picture:
Attached Images
File Type: jpg 1-p6070003-jumper-600.jpg (98.4 KB, 1151 views)
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Old 10th June 2009, 05:20 AM   #19
bichi is offline bichi  United States
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For the more technically inclined, replace jumper with capacitor to ground. (board removal from frame)
- 150nF installed, calc'ed from core 125mHz switching frequency. (metalized poly film @ 200vdc, only because I had them)
- remove heatsink clips carefully, keeping "clip-lip" from dragging across silicon-rubber thermal cover. Easily torn.

Series of five annotated pictures below...


Other Notes:
- source: modified XFI Elite Pro, diddled low-pass filter values, with Intersil EL2227 opamp.
- speakers: Beovox MC120.2's with reworked crossovers, vents and woofers.
- previous power supply: single 320va torroid, 2 x 20vac secondaries, powering 2 BrianGT LM3886's.
- supply caps: RIFA PEH532JCD5100M2 10kuF @ 35vdc, one each rail.
- supply snubber: 150nf + 1ohm.
- PBA150F's adjusted for 25vdc each, sagging to 24.92vdc @ 25W, (stereo,50w total), 8ohm resistive loads, white-noise input.

Only 2 hours of listening time:
- highs clean and "tinkle" free.
- mids clean and more forward.
- very tight low and mid-bass.
- seems to have much less siblients and wider/imaging soundstage...
- overall, satisfied with this cheap experiment...

Picture(s):
Attached Images
File Type: jpg 2-p6070004-clip-600.jpg (81.2 KB, 1092 views)
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Old 10th June 2009, 05:22 AM   #20
bichi is offline bichi  United States
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next picture:
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File Type: jpg 3-p6070006-hardware parts assembly-600.jpg (94.8 KB, 1089 views)
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