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Old 3rd April 2014, 01:52 PM   #231
00940 is offline 00940  Belgium
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Yep. That much was clear. I'm pretty much stuck with the 25mm one anyway, since the case intended for the project is 1U (40mm high).

The 25mm high one is 14K/W. It should be ok, as I'm only looking for a drop of 7 to 8V at 0.2A, or about 1.5W per heatsink.

Thanks again for those new boards.
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Old 11th April 2014, 06:08 PM   #232
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Euvl,
I am going to try your experimental HV reg in a Salas 6v6 preamp build. What kind of input voltage should I be looking at for an output voltage of 340V. I am unsure about the amount of dropout to allow for. Also, I assume that the ratio of R2/R3(6.9)is what determines the output voltage.
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Old 12th April 2014, 08:51 AM   #233
AndrewT is offline AndrewT  Scotland
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Buzz
it is usual to use a transformer voltage that equals the regulated output voltage. BUT !!!! this only applies over a small range of regulated voltage, i.e. ~9Vdc to ~25Vdc.
At lower voltages you need a bit extra AC supply voltage. At higher voltages you need a bit less, say 25Vdc to 50Vdc.

At very high voltage the general guidance falls apart.
You need to work it out.

I'll take a guess that a 115:280Vac transformer is suitable.
The range of supply voltage could be 108Vac to 126Vac.

Start with your lowest voltage.
The open circuit voltage from your transformer is:
Vpk = Vsupply/Vrated*Vsecondary*Transformer regulation*sqrt(2) -Diode drop
=[108/115*280*{1+8%/100}*1.414]-1.4~400Vpk
Will the 400Vpk be sufficient when the transformer is loaded to give sufficient Vdrop across the CCS and yield 350Vdc? Probably. As a second guess take off half the transformer regulation, i.e. remove 4% giving Vdrop = 384-350 = 34Vdrop.

Now look at the highest voltage which is available and must be acceptable to the regulator devices:
Vpk = Vsupply/Vrated*Vsecondary*Transformer regulation*sqrt(2) -Diode drop
=[126/115*280*{1+8%/100}*1.414]-1.4 ~467Vpk

The CCS must now drop 467 - 350 ~ 117Vdrop.
Calculate the power that must be dissipated in the CCS for this maximum supply voltage. Pmax = Vdrop* Iccs

Go and find out your numbers to put into the two equations.
You need YOUR numbers.
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Last edited by AndrewT; 12th April 2014 at 08:54 AM.
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Old 12th April 2014, 11:27 AM   #234
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Thanks Andrew. I have 115 mains and happent to have a transformer with 300V secondaries, so i will try that just for the sake of availabilty. In this preamp, the CCS should dissipate about 3w, if my math is correct, as it will draw about 20mA per channel and I am going dual mono.
I appreciate the thorough explanation.
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Old 16th April 2014, 01:17 PM   #235
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Also doing a positive version for a RIAA stage. I need 36V=/-, so I have made the following changes. t
opamp = LT-1792
d2=18V
r4=2.2K
r5=22K
r6=4.32k
All caps are 50V 120uF Panasonic FM. They have an ESR that is 1/4th of the FC. I assume this will not create a problem.
Also, I am using the LM317 as a prereg and wanted to know if the resistor combination needed to be changed. I assume that it follows the ouput voltage, but do not know hoe to calculate the setting resistors. It appears to set the voltage slightly higher than the ouput, but not sure.
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Old 16th April 2014, 05:54 PM   #236
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Quote:
Originally Posted by buzzforb View Post
I need 36V=/-, so I have made the following changes.
One change you should consider is changing the opamp to something like an OPA604 -- it's a single with higher voltage capabilities.
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Old 16th April 2014, 06:03 PM   #237
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Are you suggesting that it will perform better than the Lt1792. The Lt has better numbers, but only guarenteed at spec'd working voltages.

Edit:
I went apolitical and got the OPA604 because it was cheaper. Thanks Jack.
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Last edited by buzzforb; 16th April 2014 at 06:31 PM.
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Old 16th April 2014, 06:36 PM   #238
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Quote:
Originally Posted by buzzforb View Post
Are you suggesting that it will perform better than the Lt1792. The Lt has better numbers, but only guarenteed at spec'd working voltages.
The OPA604/2604 are +/-24V, the LT1792 is +/-20V.

I have nothing against the LT1792, just have good results with the TI device. It might offer you a bit better protection against a high rail voltage.
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Old 16th April 2014, 07:22 PM   #239
EUVL is offline EUVL  Europe
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There are high voltage opamps around (if I remember correctly from both LT & AD) that has excellent specs.

And the voltage headroom depends on the current consumption and the size of the cap after rectifier.
Do a sim on Spice. That will give you a better indication.



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Old 16th April 2014, 07:36 PM   #240
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I am not good with Spice and at the moment, do not have the time to learn. If all looks good with the above changes, I will move forward with the OPA604. Thank you both.
Btw, Euvl. I will be giving a version of your F5X preamp a go. Using Toshiba instead of the lats you went with, simply because i have them. Sorry for OT.
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Last edited by buzzforb; 16th April 2014 at 07:38 PM.
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