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 30th July 2011, 10:05 AM #71 diyAudio Member   Join Date: Sep 2009 Location: Spain Hello, I also I have regulators to feed a buffalo dac. I sign the recommendation for R1. For an output of 15.5 volts and a simulation of 450 ma, what I recommended load resistance? Same for 5.5 volts and 450 ma. Thanks
 30th July 2011, 11:07 AM #72 diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece Say you got one result like in post 68, then it will be 3R3 (+) and 2R2 for (-). Its Ohm's law. You see the voltage drop, you calculate V/R. Its in the guide.
 30th July 2011, 01:39 PM #73 not politcally affiliated diyAudio Member     Join Date: Feb 2006 Location: Kennebunk Blog Entries: 10 I use 3.3R in my 15v one, I forgot what we calculated the current to be. The R1's don't get crazy hot. __________________ Salas Boards GB 2017#1 ON ORDER | GB 2017 #2 Click Here to Sign Up! | Hot-Rod DCB1 boards and kits In Stock, PM | M2C Boards On ORDER
 30th July 2011, 04:49 PM #74 diyAudio Member   Join Date: Jun 2009 Location: Athens Hi, I have some EVOX MMK 15μF from another project. Can i use them for C102,202,302,104,204,304, or they are too big?
 30th July 2011, 06:47 PM #75 diyAudio Member   Join Date: Sep 2009 Location: Spain Thank you very much for the answers. I have already clear how to calculate R1. My question is about the dummy load resistor at the output. I guess for 5 and 15 volts and simulate consumption of 450 m is 12 ohms and 33 ohms respectively.
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Join Date: Oct 2002
Location: Athens-Greece
Quote:
 Originally Posted by manamanam Hi, I have some EVOX MMK 15μF from another project. Can i use them for C102,202,302,104,204,304, or they are too big?
For value they are not too big.

diyAudio Chief Moderator

Join Date: Oct 2002
Location: Athens-Greece
Quote:
 Originally Posted by albertob Thank you very much for the answers. I have already clear how to calculate R1. My question is about the dummy load resistor at the output. I guess for 5 and 15 volts and simulate consumption of 450 m is 12 ohms and 33 ohms respectively.
They must be 33R 15W and 12R 5W to hold.

diyAudio Member

Join Date: Jun 2009
Location: Athens
First 5.5V out build is working!
568mA CCS, 30mV voltage drift, perfect clean output, no oscillations.

I noticed when tuning the CCS resistor, that the voltage across it is more with bigger resistor values and less with smaller resistor values.
For example:
12Ω resistor, 1.87V
2Ω2 resistor, 1.25V
Is this normal?
Attached Images
 IMG_1609.JPG (97.4 KB, 1058 views)

 31st July 2011, 10:16 AM #79 diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece Vgs is a curve regarding current in Mosfets, so its normal. Looks good.
 31st July 2011, 02:43 PM #80 diyAudio Member     Join Date: Oct 2007 Work in progress for my psu for the simplistic RIAA It will be a 45VDC supply. BTW, Salas: how much current does my 15mA RIAA consume, what would be a correct load resistor to test the psu? Franz

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