diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Tubes / Valves (http://www.diyaudio.com/forums/tubes-valves/)
-   -   New DHT heater (http://www.diyaudio.com/forums/tubes-valves/38248-new-dht-heater.html)

Guido Tent 22nd July 2004 08:21 AM

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

Bas Horneman 22nd July 2004 08:30 AM

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

Sch3mat1c 22nd July 2004 08:51 AM

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

Frank Berry 22nd July 2004 09:39 AM

... and no short circuit protection?

Pjotr 22nd July 2004 10:20 AM

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?

;)

ultranalog 22nd July 2004 12:08 PM

A current source fed back from a voltage reference...

is a voltage source.

ThorstenL 22nd July 2004 12:30 PM

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

ultranalog 22nd July 2004 12:38 PM

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.

Pjotr 22nd July 2004 12:55 PM

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 ;)

Guido Tent 22nd July 2004 01:43 PM

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


All times are GMT. The time now is 11:08 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2