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30w Jean Hiraga Power Supply Design, one large capacitor or several?
30w Jean Hiraga Power Supply Design, one large capacitor or several?
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Old 6th September 2018, 02:58 PM   #221
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by silasmellor View Post
Surely the amount of amps you measure will be determined by the load resistors you use, so Iím confused what this tells you. Seems like circular logic to me...
Yup just making sure and actually learning as i go along!
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Old 6th September 2018, 04:01 PM   #222
jazz is offline jazz  Netherlands
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Hi,

In reply to the pm i scanned the thread quickly. Good info and advise from Alan. At first glance everything checks out ok and approximately as simmed and calculated. nice

I would still like to see a voltage measurement for each rail voltage at the same time. That would require two Multimeters (MM). I don't know if the multimeter is an rms one. If it is, i would try and measure ac across both rails as well. should be near zero. for clarity, connect the positive rail mm between positive output to the red mm lead (+28v) and the black lead to central ground. reverse for negative rail (red to -28v, black to central grround) even the cheapest mm's will do for the dc voltage. Voltage differential should be about the same (+28V/-28V).


If all checks out you can start building. don't worry about the 2r2 resistors. I specified 2*3w and you used 2*7w. Yes they get hot but they are well within rating, no more then 30% guestimate. These are rated in free air. push them apart a bit for allowing more air flow around them. They will be ok for now anyway, get it working and listen to the amp before changing anything now.

I will be out for holidays two weeks from saturday, so wont be much help during that time. However, if the measurements all check out, i'd suggest moving over to the thread in the solid state forum. Go there for help in getting the amp circuits working. I will check when i can but pm with a link is ok too.


regards,
Joris
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Last edited by jazz; 6th September 2018 at 04:30 PM.
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Old 6th September 2018, 06:44 PM   #223
vishalk is offline vishalk  United Kingdom
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Thanks Joris!

I have two multimeters and the voltages were the same, i also did a check for AC voltages and it was near 0! Thanks to you i have got this far (and other members) but you helped greatly by designing the PSU.

Ok lets finish building this! Let me know when you are back from Holidays. Enjoy!
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Old 10th September 2018, 08:22 AM   #224
vishalk is offline vishalk  United Kingdom
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please go to this thread to see this finally being finished!

Jean Hiraga Super Class A 30w Build
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