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Rod Elliott's capacitance multiplier supply
Rod Elliott's capacitance multiplier supply
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Old 27th April 2009, 08:54 AM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by AndrewT
two channels of lm3886 running on +-35Vdc into 8ohm speaker can demand transients approaching 22Apk.

What will 10 channels demand?
10 channel active system with different impedance loading on each channel and different power delivery on each channel.
I have no idea how to model the peak current demand.
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Old 27th April 2009, 03:11 PM   #12
454Casull is offline 454Casull  Canada
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Quote:
Originally posted by AndrewT
10 channel active system with different impedance loading on each channel and different power delivery on each channel.
I have no idea how to model the peak current demand.
You can't simply add up the current for each channel?
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Old 27th April 2009, 03:42 PM   #13
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by AndrewT
I have no idea how to model the peak current demand.
That's why I said that.
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Old 27th April 2009, 04:44 PM   #14
454Casull is offline 454Casull  Canada
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Quote:
Originally posted by AndrewT
That's why I said that.
What's wrong with taking it from I=P/R given R is the minimum impedance and P is the power for the whole driver? That should be fine for a full-power single tone at the minimum impedance, which would never even happen with music.

That's what I did in the spreadsheet, btw. If you could have a look at that and tell me if my calculations are off, that'd be great.

EDIT: Latest revision here

http://www.sendspace.com/file/7dmtb7
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Old 29th April 2009, 04:55 AM   #15
Efren Noble is offline Efren Noble  Philippines
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Default which transistor to use?

Hello .454Casul

try this for size, perhaps it will give you enough headroom:

MJ14002- npn, 300w,80v, 60A (TO-3)
MJ14003-pnp, 300w, 80v, 60A (TO-3)

MJ11032-npn, 300w, 120v, 50A, darlington, (TO-3)
MJ11033-pnp, 300w, 120v, 50A, darlington, (TO-3)

just check if such devices are available in your area, i got those specs from Electronics Enthusiast, Projects & Circuits vol.5, locally available in our country.

best regards,

efren.
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Old 20th February 2010, 05:13 AM   #16
branet is offline branet  Croatia
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I tried to make a PCB for capacitance multiplier supply .
The first time that I we done PCB so if you can tell me whether it is O.K.
PAD 1,2,3,4, are inputs from the transformer ,PAD 8 is + , PAD 5 is - , and between C4 C7 is GND .
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File Type: jpg pcb.JPG (90.3 KB, 533 views)
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Old 22nd February 2010, 05:11 AM   #17
Efren Noble is offline Efren Noble  Philippines
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branet,

it looks as if you've done this so many times, nicely done but the clamping diodes at the output seems to be missing, unless you intend to solder them directly on the foil side.,

in my limited knowledge, clamping diodes will protect the power transistors in the event that those filter capacitors (before the transistors, after the rectifiers) discharges faster than those in the output which rarely happens...
just to be sure better to have them.

will these be for class A amp? (a MUST for all class A amp, unless you'll be using lead-acid batteries).

Best Regards
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Old 22nd February 2010, 12:26 PM   #18
branet is offline branet  Croatia
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Thanks Efren Noble ,"clamping diodes" I do not know whether they are perhaps D9 and D10 on the edges of the PCB board.
I am a beginner so I do not know.
Once again thanks!
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Old 21st March 2010, 04:48 PM   #19
butch_vlad is offline butch_vlad  United Kingdom
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did you try the pcb yet?
looks promising
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Old 21st March 2010, 06:22 PM   #20
john65b is offline john65b  United States
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I may be interested in a couple PCB sets if you do a group buy.
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