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Old 27th March 2007, 08:25 PM   #501
marus is offline marus  Romania
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I'd like to start a discussion about K6 SMPS.
HERE is the original link. I think you know it already.
I put HERE a more clear schematic made by me.
And HERE what i have done so far.
I can't connect this on the main power because i don't understand all schematic, and the most thing i hate is the IC2b integrator
I know , i'm a beginer, but what can i do now ? I must finish this.
So, I'll be very happy if anyone can explain me. At last tell me if it's right so i can go on
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Old 7th April 2007, 01:52 PM   #502
Bonsai is online now Bonsai  Taiwan
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I think Tony from Russia a few posts back hit the nail on the had. I've used this approach and the results are great - ear up against speaker cones and there is zero noise from tweeters, mid or woofers (yes, the amp is powered up).
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Old 7th April 2007, 02:26 PM   #503
AndrewT is offline AndrewT  Scotland
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Default Tony's nail ?

post 468 or post 479? or some other?
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Old 7th April 2007, 03:06 PM   #504
Bonsai is online now Bonsai  Taiwan
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479.

Well articulated and it works.
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Old 8th April 2007, 12:59 AM   #505
AJT is offline AJT  Philippines
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Quote:
Originally posted by Bonsai
I think Tony from Russia a few posts back hit the nail on the had. I've used this approach and the results are great - ear up against speaker cones and there is zero noise from tweeters, mid or woofers (yes, the amp is powered up).

yeah, worked for me all the time....

btw, i am from manila working in the sahkalin island build an LNG refinery....




HAPPY EASTER TO ONE AND ALL......
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Old 21st April 2007, 06:19 AM   #506
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Simple linear power supply with BIG caps

http://byrne.isa-geek.com/brendan/power.bmp
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Old 2nd May 2007, 04:55 PM   #507
pooge is offline pooge  United States
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Quote:
Originally posted by AKSA
Bob,

I've found there are gains to be had with superior power supply caps. I use the Nichicon Gold Tune, which are made to order. Nice caps with excellent bass.

However, topology must play a part. These caps have two purposes; one to smooth the power pulses coming off the rectifier (and these are pretty savage), and the other to accommodate speaker earth return current. If both these currents coexist in the same cap, then intermodulation results, so I like to use two caps per rail, separate them with a small resistor (typically 0R22, or even a tiny inductor around half a millihenry) so that the two currents are separated.

Cheers,

Hugh
Hugh, are you talking "pi" filter here, or using resistor/inductor on the ground sides?
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Old 16th May 2007, 06:40 PM   #508
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Default torroidal power transformers

I recently substituted a torroidal power transformer in an amplifier where there had been a conventional one. While doing some detailed distortion analysis, where THD and IM products were hovering in the -100 dB range, I noticed a spray of 120 Hz harmonics disguising themselves as spectrum analyzer noise floor (out to several kHz or more). I'm pretty sure I hadn't seen that before. I also noticed that the position of the input and output wires to the amp under test had a big influence on this. Has anyone else seen this effect with torroidal power transformers, or am I just imgaining things. Admittedly, I was just using an ordinary 30A bridge rectifier.

Bob
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Old 16th May 2007, 07:22 PM   #509
anli is offline anli  Russian Federation
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Default Re: torroidal power transformers

Quote:
Originally posted by Bob Cordell
I recently substituted a torroidal power transformer in an amplifier where there had been a conventional one. While doing some detailed distortion analysis, where THD and IM products were hovering in the -100 dB range, I noticed a spray of 120 Hz harmonics disguising themselves as spectrum analyzer noise floor (out to several kHz or more). I'm pretty sure I hadn't seen that before. I also noticed that the position of the input and output wires to the amp under test had a big influence on this. Has anyone else seen this effect with torroidal power transformers, or am I just imgaining things. Admittedly, I was just using an ordinary 30A bridge rectifier.

Bob
Bob,

I have had the same effects when "standard" toroidal trans was in use. After replacing of last one with "special" trans the problem has gone. "Special" means reduced induction (down to 1.1-1.2Tl instead of 1.4-1.5Tl), which was achieved by rising turns amount (about 40-50% above "standard"). A drawback is, you need a wire with bigger diameter, or be ready a trans will be warm and "soft" - I mean secondary resistance. Very simple.
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Old 17th May 2007, 02:18 PM   #510
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Default Re: Re: torroidal power transformers

Quote:
Originally posted by anli

Bob,

I have had the same effects when "standard" toroidal trans was in use. After replacing of last one with "special" trans the problem has gone. "Special" means reduced induction (down to 1.1-1.2Tl instead of 1.4-1.5Tl), which was achieved by rising turns amount (about 40-50% above "standard"). A drawback is, you need a wire with bigger diameter, or be ready a trans will be warm and "soft" - I mean secondary resistance. Very simple.

Very good observation. Are these "special" toroidal transformers readily available anywhere? Do toroidal transformer makers normally spec the amount of induction? I am certainly not much of an expert on transformers.

Finally, can I get a relative measure of the amount of induction by knowing the volts-per-turn of the toroid (i.e., wind ten turns on it, measure the voltage, and divide by ten)?

Thanks,
Bob
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