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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 2nd July 2013, 03:39 PM   #411
Triodethom is offline Triodethom  United States
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Quote:
Originally Posted by AndrewT View Post
over what range of frequencies?

If the reg let's through most of the HF stuff, then the next reg will let through most of that same HF stuff.
True but the over all level of hf would be lower with the shape of the PSRR curve being about the same . The fact that the curve is not linear in to say 200k is to me more of a problem than the exact level in the range if say less than -80db .
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Old 3rd July 2013, 09:52 AM   #412
HiFiNutNut is offline HiFiNutNut  Australia
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Originally Posted by keantoken View Post
How many extra effective inches of output inductance is too much?
Safe bet is two to three inches while achieving 120dB PSRR.

I learnt it the hard way and found that long wires to the load from a regulator really destroyed the sound.
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Old 3rd July 2013, 09:54 AM   #413
HiFiNutNut is offline HiFiNutNut  Australia
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Originally Posted by AndrewT View Post
over what range of frequencies?

If the reg let's through most of the HF stuff, then the next reg will let through most of that same HF stuff.
What is why I always prefer having some LRC to get rid of the junks above 100kHz. With LRC you can easily get 120dB above 100kHz.
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Old 3rd July 2013, 10:04 AM   #414
keantoken is offline keantoken  United States
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So, it seems load regulation harmonics matter for the sonics of regulators. We could however do the same test on the output of a power amp. I'm guessing if the effect is audible for regulators, then the sonic effect at the output of a power amp must be so much more.
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Old 3rd July 2013, 11:31 AM   #415
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by HiFiNutNut View Post
...120dB above 100kHz......
Quote:
Originally Posted by keantoken View Post
.... effect at the output of a power amp........

would that improve/increase stability of power amp ?
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Old 3rd July 2013, 11:51 AM   #416
keantoken is offline keantoken  United States
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Most amp designs lavishly pile on the RF/ultrasonic loading to one stage, so there is a lot of damage even a small ultrasonic/RF signal might do. Very low-THD amps will probably suffer the most, relatively.

So high PSRR at 100KHz probably isn't a bad idea, as long as your circuit is already well-shielded from stray fields.
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Old 4th July 2013, 02:51 AM   #417
audiostar is offline audiostar  United States
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Hi Keantoken,
Sometime in the past you said you were going to get somebody to listen to your power amplifier. How did that go? Also when are you going to start a thread about your power amplifier?
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Old 4th July 2013, 05:51 AM   #418
keantoken is offline keantoken  United States
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Before my amp was finished I had found a better design. This repeated 5 times.

Only now do I just barely have everything I may need to get something road-worthy. And that will wait until I have something that sounds as good as it's specs.

Each time I find a better design I have realized others have done it to some extent already. However many of these designs are nothing more than simulation. We have the knowledge to advance the state of audio amplifiers - we just need to apply it.
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Old 4th July 2013, 07:16 PM   #419
Krisfr is online now Krisfr  United States
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Hi Keantoken

Is the schematic in post 329 the final final schemo? Is there ANYTHING else to add to the circuit such as caps on the front end?

I am going to do a ps for the front end + VAS of an amp and I want to make sure that I am in the right ball park to make it right the first time.

Thanks for all your work and for sharing it with the forum.

Thanks
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Old 5th July 2013, 10:42 PM   #420
keantoken is offline keantoken  United States
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The circuit needs a lytic at the input. What are your rail voltages?
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