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Old 22nd July 2004, 08:21 AM   #1
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Default New DHT heater

dear all,

Please allow me to anounce:

http://www.tentlabs.com/ProductEntit...terSupply.html

also the backgrounds might be of interest

http://www.tentlabs.com/Info/Article...ingmethods.pdf

enjoy

Guido
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Old 22nd July 2004, 08:30 AM   #2
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Hallo Guido,

Is this the DHT supply that Triode Dick was raving about? (But could not yet reveal?)

Could you explain in layman's terms what is new about this idea?

Regards,
Bas
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Old 22nd July 2004, 08:51 AM   #3
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And why would you give someone else your money for something that you can make out of LM317s?

I mean, spending money makes things sounds good, but that's beside the point.

Tim
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Old 22nd July 2004, 09:39 AM   #4
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... and no short circuit protection?
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Old 22nd July 2004, 10:20 AM   #5
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Don’t get it either. As far as I understand Guido’s page it is a voltage limited current source. Probably it will be baked when short circuited?

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Old 22nd July 2004, 12:08 PM   #6
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A current source fed back from a voltage reference...

is a voltage source.
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Old 22nd July 2004, 12:30 PM   #7
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Konnichiwa,

Quote:
Originally posted by ultranalog
A current source fed back from a voltage reference...
is a voltage source.
Hmmm. I have no idea what Guido's circuit looks like, but I have been thinking about stuff like this myself. It is quite trivial to design an "electronic filter choke" which can (as a side-effect) operate as voltage regulator, but which has an impedance rising at a rate of 20db/decade (impedance multiplies by a factor 10 for each decade in frequency), whihc could have very significant levels of Impedance even at 100/120Hz.

This would certainly combine the behaviour of a CCS and a CVS with a certain transtition region at very low frequencies.

Sayonara
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Old 22nd July 2004, 12:38 PM   #8
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That is exactly the point that has been mystified in this story.

A first order is easily achieved with an L200. Myself, I'd go for a 1 Hz, 4th order turnover or something alike.
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Old 22nd July 2004, 12:55 PM   #9
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Quite right KYW,

IMHO it is more effective to keep mains and rectifier related noise away from the DH cathode by proper LC filtering. A simple LM317 or LM338 will do then as a voltage regulator and electronic low frequency filter.

Just my 2 cents
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Old 22nd July 2004, 01:43 PM   #10
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Quote:
Originally posted by Bas Horneman
Hallo Guido,

Is this the DHT supply that Triode Dick was raving about? (But could not yet reveal?

Could you explain in layman's terms what is new about this idea?

Regards,
Bas

Yes, it is what excited Triode Dick...............

read the site, I put a lot of background info there !

cheers
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