Universal power supply board for audio amplifier - diyAudio
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Old 27th October 2011, 06:24 AM   #1
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Default Universal power supply board for audio amplifier

Hell all
This is a beautiful looking, well designed and built universal power supply board for audio power amplifiers. It has on board bridge rectifier, large filter capacitors and speak protecting circuit. Ideal to be used for any amplifers powered by less than +-50V.

Features
- 1.6mm double side PCB with 2oZ copper
-
35A/200V bridge rectifier with heatsink
- 6 x 100uF/50V top grade NOVER electrolytic capacitor as premiary filter
- ELNA electrolytic capacitor as secondary filter
- uPC1237 speaker protecting circuit
- No seperated power supply needed for the protecting circuit
- Suited for any type amplifier (OCL/BTL/OTL/Class-D)
- Max current: 10A
- Voltage: Dual AC15V to 35V
- Dimension: 145mm x 95mm x 60mm


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Old 4th February 2012, 08:52 PM   #2
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Thanks this power supply looks very powerful.
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Old 6th February 2012, 08:55 AM   #3
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Hi Aymantn, pls do not use our forum for your ad, thanks
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Old 12th February 2012, 04:42 AM   #4
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wow, look nice, what is it comprised of ? I'm curently searching for power supply circuit that comprise of protection for main supply "madness" which when ittermitent sparks, such as when switching fluorescent light.
Previously it was only creating noise, but few days ago it fry one of my amplifier component....

I have no idea what this is called, but i found such description :
Quote:
Power-line voltage normally consists of a broad spectrum of harmonics and noise in addition to the pure 60 Hz sine wave. The noise is created by power supplies in electronic
equipment, fluorescent lights, light dimmers, and intermittent or sparking loads such as switches, relays, or brush type motors (blenders, vacuum cleaners, etc.). The drawing at right
shows how sudden changes in load current caused by an ordinary phase-control light dimmer generate high-frequency power line noise. At high frequencies, a building's power wiring behaves like a system of mis-terminated transmission lines gone berserk, reflecting high frequency energy back and forth throughout the building’s wiring until it is eventually absorbed or radiated
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Old 12th February 2012, 12:53 PM   #5
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Hi guitar

This power supply board can't stop the shocks on power line. You need a power line filter, or cleaner, usually composed of a group of LC filters.

Some inductance load on the power line (such as large motor) really generate terrible shock when turn on and off.
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Old 12th February 2012, 11:44 PM   #6
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hm.... i'm thinking DIY, making myself using varistors, capacitor, resistor & inductor. But I have no idea what value should i put. Any guideline ?
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Old 13th February 2012, 02:30 AM   #7
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The best solution is a 50Hz band pass filter. I will simulate one later today or tomorrow
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Old 13th February 2012, 02:57 AM   #8
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hm... not so good i think, my country standard is 60Hz, so maybe low-pass fitler should be sufficient. Which should include capacitive, resistive & inductive filter. (more secure)

I'm also going to simulate one, see if is similar X.x
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Old 13th February 2012, 03:01 AM   #9
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I think a CLC low pass filter with 80Hz cut off freq would works fine. It's not good to use a resistor in the filter network because it will reduce the dynamic performance of the amp.
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Old 13th February 2012, 04:21 AM   #10
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hm... i thought of that, but i'm also implies one of this in main supply, so i don't think it will degrade much, maybe will provide less main voltage.

I have roughly planned out one in the attachment. It can continues operate quite smooth ranging ripple of "100V~1k" to "1000V~100k", should be quite immune.
But the main supply of 240V p-p become into 210V p-p, i think still could be improve. Will try to remove that resistor. But reducing inductor to 1H will further increase the supply, to about 230V p-p.
Most of the ripple/surge will mostly absorb by inductor, other 2 components are for further smoothen. (I guess is a bit waste ?)

Single series Inductor of 0.5H also give good result at very high frequency. but rather poor smoothing at 1k ripple. About what frequency will the noise introduce at my situation ?
Will try out CLC type too...
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Last edited by guitar89; 13th February 2012 at 04:28 AM.
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