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Heater PS schematic [message #30364]

Wed, 02 February 2005 15:06

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

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.

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Re: Heater PS schematic [message #30365 is a reply to message #30364]

Wed, 02 February 2005 15:12

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Thanks Damir; what are you up to lately?

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Re: Heater PS schematic some more [message #30366 is a reply to message #30364]

Wed, 02 February 2005 15:14

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

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...

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Re: Heater PS schematic [message #30367 is a reply to message #30365]

Wed, 02 February 2005 15:23

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

You mean tubes, etc? Nothing concrete (soldering). Unfinished breadborded projects, just theory... "Ra" formula...

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Different values than PSU simulation [message #30368 is a reply to message #30364]

Wed, 02 February 2005 15:31

colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas

Illuminati (3rd Degree)

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.

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Re: Different values than PSU simulation [message #30369 is a reply to message #30368]

Wed, 02 February 2005 15:45

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

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...

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Re: Different values than PSU simulation [message #30370 is a reply to message #30369]

Wed, 02 February 2005 16:11

colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas

Illuminati (3rd Degree)

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

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