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Old 19th February 2011, 05:29 PM   #11
euro21 is online now euro21  Hungary
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e-choke sample
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Old 19th February 2011, 09:02 PM   #12
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I use this electronic choke
elchoke.png
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Old 19th February 2011, 09:18 PM   #13
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Wikipedia is a good source of rumor and opinions, but a bad source of reliable information. What is called a capacitance multiplier, does not work as a multiplier: it does not have a capacitive output, strictly speaking. And it does not have properties of inductance, so it is not a choke. It is a R-C filter with a source follower. A good way to filter rectified power, even to bring up output voltage slowly, using relatively small capacitance and big resistance in R-C network for a large time constant.

I saw attempts to use gyrators there, to simulate a choke. It is even worse! P-network tuned on fundamental frequency of rectified power has higher dynamic output resistance than this simple source follower with R-C network in it's gate.
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Old 19th February 2011, 10:01 PM   #14
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Every time I'm more confused, surely will be more easy to use an inductive choke.
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Old 19th February 2011, 10:02 PM   #15
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Here is a more value for money version
Elektronische Drossel, Mosfet Gyrator SS Choke 200mA - eBay, Röhrenverstärker, High-End Audiogeräte, Audio Hi-Fi. (Eindtijd 24-feb-11 18:01:40 CET)
Although shipping costs are quite high.

Last edited by Bas Horneman; 19th February 2011 at 10:07 PM.
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Old 19th February 2011, 10:04 PM   #16
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Every time I'm more confused, surely will be more easy to use an inductive choke.
A choke is heavier and more expensive. But I'm told has the ability to store energy and release it when needed.
But an electronic choke can simulate a choke of 90H and can then pass more current than almost all 90H chokes.
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Old 19th February 2011, 10:05 PM   #17
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Or maybe just get the PCB:
http://cgi.ebay.nl/Elektronik-Drosse...#ht_2757wt_962

Or this one. This one looks real nice.
http://cgi.ebay.nl/Elektronische-Dro...ht_2578wt_1185
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Old 19th February 2011, 10:11 PM   #18
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Originally Posted by Bas Horneman View Post
Wow Bass, with this price I will buy severals.
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Old 19th February 2011, 10:35 PM   #19
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Or maybe just get the PCB:
Elektronische Drossel, Dual Mosfet Gyrator for tube Amp bei eBay.de: Röhrenverstärker (endet 21.02.11 14:11:57 MEZ)
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Old 19th February 2011, 10:42 PM   #20
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What kind of voltage drop could you expect across one of these for say, 350V unloaded, 300V loaded and say 60-80mA draw?

Would they be a suitable replacement for the iron in say a preamp?

Fran
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