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Old 30th July 2011, 11:05 AM   #71
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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
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Old 30th July 2011, 12:07 PM   #72
Salas is offline Salas  Greece
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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.
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Old 30th July 2011, 02:39 PM   #73
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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.
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Old 30th July 2011, 05:49 PM   #74
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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?
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Old 30th July 2011, 07:47 PM   #75
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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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Old 30th July 2011, 07:53 PM   #76
Salas is offline Salas  Greece
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Quote:
Originally Posted by manamanam View Post
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.
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Old 30th July 2011, 07:55 PM   #77
Salas is offline Salas  Greece
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Quote:
Originally Posted by albertob View Post
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.
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Old 31st July 2011, 10:53 AM   #78
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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?
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Old 31st July 2011, 11:16 AM   #79
Salas is offline Salas  Greece
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Vgs is a curve regarding current in Mosfets, so its normal. Looks good.
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Old 31st July 2011, 03:43 PM   #80
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Work in progress for my psu for the simplistic RIAA

Click the image to open in full size.

Click the image to open in full size.

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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