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Old 11th February 2007, 09:03 AM   #1511
AndrewT is offline AndrewT  Scotland
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Hi,
50Vac to 60Vac depending on what impedance you want to drive.

55Vac is the voltage that those isolating portable site transformers run at. Secondhand, they are pretty cheap even in 3kVA size.

Ceramic 100V are available, I wanted 150V and had to jump all the way to 1000V since my peak voltage was just above 100V.
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Old 11th February 2007, 09:40 AM   #1512
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For Bushulo ,

BEL makes 500 V disc caps.
What value do you want ? If I have it I can send you some.
Send me a PM .
Cheers,
Ashok.
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Old 11th February 2007, 02:31 PM   #1513
Bushulo is offline Bushulo  India
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Hi Guys,

Thanks for the suggestions and your replies. Ashok thanks for the offer.
Quasi suggest me to use any non-electrolytic capacitor instead of the ceramics.

Bushulo
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Old 14th February 2007, 10:22 PM   #1514
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Hello again.

Today I have finished all PCBs for my Stereo NMOS200.

2x NMOS
1x Softstart
1x DC-protection
2x PSU

Greetings.
Black
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Old 15th February 2007, 11:11 AM   #1515
marus is offline marus  Romania
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If I have protection to PSU should i also do DC-protection to Nmos200 amp ?
I think my PSU will have Softstart too ....
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Old 15th February 2007, 11:26 AM   #1516
quasi is offline quasi  Australia
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Quote:
Originally posted by marus
If I have protection to PSU should i also do DC-protection to Nmos200 amp ?
I think my PSU will have Softstart too ....

Quasi's 2 rules to DC protection;

Rule 1. Always have it.
Rule 2. Refer to rule 1.

You will burn your speaker voice coil if you get a fault and the amp latches to rail. It will burn quicker than you can turn your amp off after you've realised what was going on. So refer to rule 1.

You should build soft start in as well. Especially if your using a toroidal transformer.

Seeya
Quasi
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Old 15th February 2007, 11:49 AM   #1517
marus is offline marus  Romania
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Quasi,

I'm refering to the K6 smps PSU. When it's protection comes in action, it stops the inverter oscilator and no voltage or current is induced in secondary so the PSU it's like unpluged...
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Old 15th February 2007, 01:23 PM   #1518
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Hello,

Quote:
You should build soft start in as well. Especially if your using a toroidal transformer.
Today I finished my Soft-Start and DC-Protection boards. Therefore I crammed out my 500VA Trorroid (bought for another project about 3 years ago, it was never used).

When I connected the primary winding to the mains, I was again remembered of the enomous current surge of torroids. After that I noticed that my torrodial was humming a bit.

I never had a machanical hum with trorroids, is that normal?

Greetings,
Black

PS: Right now I am going to assamble my two NMOS200 boards...
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Old 15th February 2007, 02:58 PM   #1519
AndrewT is offline AndrewT  Scotland
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Hi,
a big hum could be mis-wired primary, or shorted secondary, or shorted turn, or DC from the mains, or poor quality control from the factory.
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Old 15th February 2007, 08:21 PM   #1520
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In these days, there are as many P device as N device, well I should say they are easily available too. As anybody ever thought of making use of these P devices that may be lying around somewhere in the dark corners of your drawers? Since we had brother of Quasi, may we start making a sister too? Or are these P devices natural-born=retards that could have no seats in this arena?
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