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Old 28th September 2001, 01:42 PM   #1
Michel is offline Michel  Canada
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Old 29th September 2001, 05:15 AM   #2
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michel,
An LC circuit by itself isn't regulated any more than a simple bank of capacitors is. Depending on whether you choose L-C (the L filter), C-L, C-L-C (the Pi filter), etc. you're going to end up with somewhat different voltage and current ratings. In general, if you start with a capacitor coming off of the rectifier, you've going to get higher voltage, but less current capability. If you start with an inductor, you'll get less voltage, but more current.

Grey
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Old 30th September 2001, 12:47 AM   #3
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Default re LC regulation

Hi Michel,

Basic theory starts with a Voltage Supply which has no internal resistance: at any load the same output voltage is produced.

In RealLife things change: does the output stage needs Voltage (tubes most like do) or current (as solid-state's usually do).

In the tube-era CLC filters quite suited because the current-changes were low. (changes of 200mA were considered HUGE)

In the solid-state-era current changes are HUGE indeed (rail-current in my JLH design runs from 0 - 4000mA's and it only produces 15W).

Any regulations costs power and any output current delivered to the speakers must eventually pass through the regulating devices: that is one main reason why the larger High-End Amps only use big capacitor banks and no regulated power supply.

Jos

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Old 30th September 2001, 09:00 PM   #4
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Default Software to check out your LC ...

http://www.duncanamps.com/psud2/

Very nice (free) program for designing power supplies.

Petter
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Old 30th October 2001, 05:42 AM   #5
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If you're into no-feedback circuits a LC or CLC is very effective to adjust the sound.
A normal rectifier-bridge and capacitor doesn't have a even impedance, and this is clearly heard as a closed in and undynamic bass from around 50-150Hz. A suitable smoothing trough a LC or CLC makes the overall sound better.

My suggestion is CLC for the output stage and a regulation for the gain stages, and the best regulation I have found so far is a two-stage regulation, where the first is a passively regulated BJT followed by a midsize cap (app. 2200uF) and the second a passively regulated MOSFET that is followed by a small high quality foil cap.(1-2,2uF).
Feedback in the regulator have the same effect on the sound as feedback in the amp circuit itself so please use as little as possible.

/Janne
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