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Old 28th September 2011, 07:06 AM   #501
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Quote:
Originally Posted by danieljw View Post
Hi Al,

Sounds like a good idea

-Dan
Hi Dan, I finished a F5 clone the last days, with these big transistors. Big fun!
Hows life behind the soldering iron, any time left?
albert
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Old 28th September 2011, 03:56 PM   #502
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Hello
I didn't tested yet, I'm working on two speaker project.
Greetings gabor
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Old 20th October 2011, 12:18 PM   #503
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hello guys, i've alsto tried to build my 20w hiraga version. but i'm facing a problem. i have 12v in speaker output.iwhere should i look a problem for? thak you in advance
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Old 20th October 2011, 01:18 PM   #504
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The only time I've seen that happen was when an output transistor fried. Is it 12V positive or negative? That should help you know which is bad.

It may not be a bad transistor, just one that is not conducting because of a bad connection or something wrong upstream.

I'm sure someone else will have other, better, ideas.
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Old 20th October 2011, 02:25 PM   #505
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12 is positive
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Old 20th October 2011, 02:44 PM   #506
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Both channels, or just one?
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Old 20th October 2011, 03:01 PM   #507
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just one, becaus ive built only one channel for testing
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Old 21st October 2011, 12:00 PM   #508
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forgot to tell that output transistors i use are 2sa1302 and 2sc3281. i've replaced a fried transistor 2sa632, the output voltage is 1,7v and the 5w resistors heat up very badly. oh, and this is schematic, that i've used www.tcaas.btinternet.co.uk/hiraga3fig1.gif

Last edited by moochinazz; 21st October 2011 at 12:06 PM.
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Old 21st October 2011, 01:59 PM   #509
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Moochinaz,
the board is for testing only I understand.

What I did is take out a 1k1 collector resistor and replace it with a 2 k potmeter: this will overcome imbalance in the input quad. A likely source.
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Old 21st October 2011, 02:00 PM   #510
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which one 1,1k?
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