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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 22nd July 2018, 06:47 PM   #121
jazz is offline jazz  Netherlands
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test circuit for the psu. led's anything you have will do, just a visual check for ok. then measure voltages.
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Old 22nd July 2018, 07:38 PM   #122
vishalk is offline vishalk  United Kingdom
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Joris thank you! I will order these up now and i can start building up the power supplies to test.
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Old 22nd July 2018, 07:38 PM   #123
jazz is offline jazz  Netherlands
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ohw, just dug these up. You triggered me Vishalk.
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Old 22nd July 2018, 07:53 PM   #124
jazz is offline jazz  Netherlands
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Joris thank you! I will order these up now and i can start building up the power supplies to test.
Perfect, hope to see you get started soon. remember, the dummy test resistors for the psu will be a perfect test load for simulating a speaker load on the amp it self if you connect four of them in parallel on one channel.

They make for an 8 Ohm load in parallel which is your standard test load on an amp channel. So they will come in handy in the future. No wasted money there.

Joris
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Old 22nd July 2018, 08:21 PM   #125
vishalk is offline vishalk  United Kingdom
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could i just buy a 100w 8ohm resistor?

1/2/4/8/10 Ohm 100W Watt Shell Power Aluminum Housed Case Wirewound Resistor YJ | eBay
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Old 22nd July 2018, 08:41 PM   #126
jazz is offline jazz  Netherlands
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No. you want to simulate the load. The Hiraga draws about 1,5A. So U=IxR dictates that a load for the psu should be 28/1,5= 18,6R Two times 36 Ohm parallel gives about that. Thus you need two 36R/25W per rail. P=UxI says 42W dissipation. So 25W is risky already and therefore i adviced to clamp them to the heatsinks. They will smell burnt after a few seconds.

Also you will need two sets of those because you want to test both rails at the same time. Otherwise unbalanced loading of the circuit as a whole will have a negative influence. your measurements would not be valid/relevant.

Just get those resistors, if 50W rated units are not to much mor expensive get those. Don't skimp on numbers. Buying 10 in stead of one could get you a good deal on mouser or such. They don't need to be quality, just the rating so buy the cheapest you can clamp to the heatsinks.
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Old 22nd July 2018, 08:43 PM   #127
jazz is offline jazz  Netherlands
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Last edited by jazz; 22nd July 2018 at 08:46 PM.
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Old 22nd July 2018, 08:52 PM   #128
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Ok got it! On mouser now!
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Old 23rd July 2018, 08:37 AM   #129
vishalk is offline vishalk  United Kingdom
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The closest i can get for the resistors at 50w is 33R or 39R.

I could always get say 30R and then 6R place them is series?

Thanks
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Old 23rd July 2018, 09:15 AM   #130
eduard is offline eduard  Netherlands
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Hello ,
Or use 10 and 8 ohm in series 100watt from ebay.
But they are only 100 watt if they are mounted on a big piece of alumium!!
They will blow with a big bang if you put to much power. I did that one time. The internal element has nowhere to go but sideways and it will.
Maybe try to find one like i posted a few post back. It is big as a big sigar and you can heat it up a lot that is why during test i put it on a piece of glass.
You dont need to connect it for hours. Usually a few minutes will do.
You could also buy something like 2.2 or 3 ohm 20 watts and put then on stand offs up in the air. But the alumium ones have a serious derating if you use them up in the air.
With several smaller ohmic values in series it will be easy to create another load.
Greetings, Ed
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