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Heater PS schematic [message #30364] Wed, 02 February 2005 15:06 Go to next message
Damir is currently offline  Damir
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Here`s the Doug`s (passive) RCRC version. Probably needs some "tweaking" with real trafo values, in my program/simulations both R must be 2,7 Ohms and both C about 10000uF to get 12V on the 450mA load ?!
Heater - pins 4 & 5. Diodes of your choice:-), probably the best some Schottky (40V or more, 1A or more). C1&C2 voltage 25V or more.

Re: Heater PS schematic [message #30365 is a reply to message #30364] Wed, 02 February 2005 15:12 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
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Thanks Damir; what are you up to lately?

Re: Heater PS schematic some more [message #30366 is a reply to message #30364] Wed, 02 February 2005 15:14 Go to previous messageGo to next message
Damir is currently offline  Damir
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Here`s the "alternative", regulated versions, pretty common. See "ordinary", not CT transformer and Graetz bridge of your choice (probably the best - Schottky). Regulator(s) need some heat sinks. Also, two version of grounding, one simple - negative pole to common star ground, and other "symetric", center tap is grounded (2*100 Ohms resistors) - preferable, but not really critical...

Re: Heater PS schematic [message #30367 is a reply to message #30365] Wed, 02 February 2005 15:23 Go to previous messageGo to next message
Damir is currently offline  Damir
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You mean tubes, etc? Nothing concrete (soldering). Unfinished breadborded projects, just theory... "Ra" formula...

Different values than PSU simulation [message #30368 is a reply to message #30364] Wed, 02 February 2005 15:31 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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Thanks for the picture. However, T sent a PSU file of this to me yesterday, and the resistor values were different. Your 5 ohm was given as 1 ohm, and the 3 ohm was a 2 ohm. Putting the above values (5 and 3) in PSU, I get a voltage across the load (tube's heater) of 8.5V. If, however, 2 and 1 ohm resistors are put in, the voltage across the tube's heater is right at 12.6V.

Re: Different values than PSU simulation [message #30369 is a reply to message #30368] Wed, 02 February 2005 15:45 Go to previous messageGo to next message
Damir is currently offline  Damir
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Just checked in "Circuit Maker", and get 14V with 1&2 Ohms, but I don`t have the concrete trafo data (winding resistances), and 1&2 Ohms are probably OK, but I noticed little riple, not presented in larger R / larger C version... However, those are little diffrences and can be tweaked in the "breadbording" phase...

Re: Different values than PSU simulation [message #30370 is a reply to message #30369] Wed, 02 February 2005 16:11 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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There is a lot of ripple in the RCRC when compared to the choke load (LCRC.) Actually, it was pretty impressive what the choke did to flatten the voltage out.

The 5 and 3 ohm values were what was stated in T's first post regarding the heater supply, so I know where they came from.....Colin

they were a guess [message #30372 is a reply to message #30370] Wed, 02 February 2005 16:27 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
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and then I got out the sim program from DuncanAmps. Glad you guys are taking this apart.

One thing. taking a trip until Sunday, so I'm not ignoring youse, I am just away from my desk.

Wish me luck.
regards,
Douglas

Re: they were a guess [message #30373 is a reply to message #30372] Wed, 02 February 2005 16:43 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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Oh, just wait until we get to the signal path.

Have a nice trip.....Colin

Re: Different values than PSU simulation [message #30374 is a reply to message #30368] Wed, 02 February 2005 19:04 Go to previous message
Manualblock is currently offline  Manualblock
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Say Colin; If you have a chance in the next few days could you shoot that file my way? Thanks J.R.

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