TL783 regulated B+ 250V PSU schematic - diyAudio
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Old 20th October 2008, 03:23 AM   #1
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Default TL783 regulated B+ 250V PSU schematic

Hello gentlemen,

Below is my attempt at a regulated 250v PSU, for driving two E88CC triodes.
Any comments/suggestions?
All capacitors except 10uF are Aluminum Electrolytic, 10uF are MKP.
Resistors are metal film 5%, 2W.

I tried searching the forum for similar designs but nothing concrete came up.

Thanks
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Old 20th October 2008, 08:09 AM   #2
mach1 is offline mach1  Australia
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I would lose the large 100uF cap on the output as well as the 470R series feed resistor which raises the nice low output impedance of the TL783.
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Old 20th October 2008, 02:30 PM   #3
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To "regulate" the TL783 needs to see at least 15mA load -- so you need current of this amount to flow from the output to adjust -- Texas Instruments recommends 82R.

Make sure that you use an adequately sized resistor from the adjust pin to ground -- at least 5 watts, preferably 7 watts.

So Output to Adjust 82R, Adjust to Ground 16K/7W.

The series resistor in the output -- omit this.

Read the data sheet from TI.
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Old 20th October 2008, 10:19 PM   #4
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Well the datasheet actually states that the 15mA need to flow from the output, so you (only) have to ensure that the load current is > 15mA in any condition.

Cheers

Andrea
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Old 20th October 2008, 10:37 PM   #5
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Yes but, no but, yes but, no but....

15ma across 82 ohms is 0.018 W.

15ma @250V is 3.75 W.

So, you're just burning energy -- if you're running a Class-A amp and the device is going to cook anyway -- it doesn't matter. If the load is going to vary all over the lot, then the lower value from OUT to ADJ is a better idea.

Anyone who runs a class-A amplifier will probably be hunted down by the next Stateside Administration. I hear that the Green Wing of the Dem party wants them outlawed -- and we'll all be listening to MP3's on Class-D amplifiers anyway.
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Old 20th October 2008, 11:31 PM   #6
Renron is offline Renron  United States
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Quote:
Originally posted by jackinnj
Yes but, no but, yes but, no but....

15ma across 82 ohms is 0.018 W.

15ma @250V is 3.75 W.

So, you're just burning energy -- if you're running a Class-A amp and the device is going to cook anyway -- it doesn't matter. If the load is going to vary all over the lot, then the lower value from OUT to ADJ is a better idea.

Anyone who runs a class-A amplifier will probably be hunted down by the next Stateside Administration. I hear that the Green Wing of the Dem party wants them outlawed -- and we'll all be listening to MP3's on Class-D amplifiers anyway.

Jackinnj,

ROTFLMAO!

Well said. I'm putting nighttime covers on my tubes...

Ron
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Old 20th October 2008, 11:56 PM   #7
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Quote:
Originally posted by jackinnj
-- and we'll all be listening to MP3's on Class-D amplifiers anyway.
This is a base slur. Class-D amplifiers yes, but nobody said anything about MP3s, which everybody knows are intrinsically more power hungry than uncompressed.

I know it's your politics, but the whole world's praying we don't get another idiot like the last one. Even us atheists.

w

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Old 21st October 2008, 12:25 AM   #8
Renron is offline Renron  United States
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Quote:
Originally posted by wakibaki


I know it's your politics, but the whole world's praying we don't get another idiot like the last one.
I'm a republican too, it just means something different when you live in a monarchy.

Your entitled to your opinion....but not here. This is an inappropriate thread / forum for that type of comment. Let's stick to Audio related comments. OK?

Hey, I have my thoughts too, but this 'aint the place.
Personally, I don't like being told what I can or cannot do by my government. No one was called any names or attacked in the posting of this message.

Ron
(and I approve this message)
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Old 21st October 2008, 01:49 AM   #9
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Quote:
Originally posted by wakibaki


This is a base slur. Class-D amplifiers yes,
As long as you shield the Class-D amplifier in a Faraday Cage...

Getting back to the matter at hand, the TL783 would probably benefit from a MKP from adjust to ground -- this will knock down the noise quite a bit (although it isn't helpful for transient response, as TI points out.)

Just remember, JOBs is a 3-letter word, spread it around.
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Old 21st October 2008, 02:39 AM   #10
wa2ise is offline wa2ise  United States
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Quote:
Originally posted by various people here


I would lose the large 100uF cap on the output

-----

we don't get another idiot like the last one.


I have my thoughts too, but this 'aint the place.

I could have done better, and I have no political skills whatsoever...

Back to audio: I'd be worried if that regulator could take it if the output should get shorted to ground, or takes enough of a nosedive to overvoltage the regulator's ratings. The cap will look like a short for some brief period of time, long enough to kill the regulator. Instant chip death, and probably will blow shorted, feeding unregulated full B+ to the load. Doesn't take much to kill semiconductors, transients tubes laugh at will take out solid state.
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