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Old 22nd January 2012, 07:20 PM   #11
a.wayne is offline a.wayne  United States
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Ray,

Whats inclusive in the full kits ....?
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Old 23rd January 2012, 02:56 AM   #12
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Hi Wayne,

The full kit include PCB and all components on the amp board, thanks
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Old 23rd January 2012, 03:01 AM   #13
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Hello Serial Port

Sorry for missing the value of R10. 0.33 or 0.51 Ohm is OK.
I think no harm to use matched BC550/560, but I tried both matched/unmatched, I couldn't find difference by either instrument or my ears.

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Originally Posted by RS232 View Post
Thanks for the fast shipping
I have 2 questions
The first is the value of R10 ?
The second one is: do the BC550/560 need to be matched ?

Many thanks
Ric
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Old 24th January 2012, 01:15 PM   #14
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Hi Ray: I have received your boards but was wondering if there are any mods I could make to use these boards for some small 4 ohm speakers? This would be for a little mp3 player I am making. Thanks for your boards. ( :
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Old 24th January 2012, 01:25 PM   #15
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I had tried with 8Ohm small speaker, Iq set to 0.6A, sound pretty nice. But a larger heatsink is ncecssary for Q1 and Q2. It's better to replace Q3 and Q8 with meadium power transistors such as BD139/BD140.
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Old 24th January 2012, 02:51 PM   #16
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Hi Ray. Would I need one of your power supplies for both boards/channels, or one for each?
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Old 24th January 2012, 04:04 PM   #17
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Thanks for the quick response Ray. I will give it a go. ( :
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Old 31st January 2012, 07:41 AM   #18
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Hi, one supply for 2 channels. one supply can source 4A without overheating. enough for 1.6A Iq per channel.

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Originally Posted by MisterRogers View Post
Hi Ray. Would I need one of your power supplies for both boards/channels, or one for each?
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Old 15th February 2012, 01:50 PM   #19
vgeorge is offline vgeorge  Greece
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Hi,

just built the headphone amp, but I am getting oscillation at the output. I am using mje15030. Any ideas?
Also I see on your pictures that Q3 is positioned reverse from the marking of the silkscreen. Not so easy to see from the pictures. I do not think that the pcb has any mistakes, as far as I checked.
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Old 15th February 2012, 10:06 PM   #20
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Hi vgeorge

the reverse position of the Q3 is because we tried other transistors than BC550. The pin count of BC550 is in cbe order while most others are in ebc order. can you post a photo of the board you built?
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