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Old 16th August 2012, 02:41 PM   #6821
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Jacco thanks, you have hidden qualities.

patriz, yes this potmeter is linear. I use Alps blue with middle dent.
Marcin even made a PCB. You can send him a PM if you want information.
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Old 16th August 2012, 03:01 PM   #6822
RCruz is offline RCruz  Switzerland
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Almost finished stuffing the second board Just waiting for some micas for the power transistors.

Now I am in trouble with the riaa caps... my sourcing went wrong and bought amtrans caps from hificollective... too much variation... need to use big caps I have in stock (REL-CAP 15n) so I will use an external riaa after all.

To connect the external riaa, is it sufficient to connect it to the indicated place in the board or do I need to do some shunts ?
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Old 16th August 2012, 04:09 PM   #6823
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by jacco vermeulen View Post
Mpp

Hoplahop ?
Jacco (I am confused/puzzled) why re-posting these links? Hoplahophop
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Old 16th August 2012, 04:18 PM   #6824
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154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127
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Old 16th August 2012, 04:38 PM   #6825
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by jacco vermeulen View Post
154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127
That's stange, both links (the one Joachim posted and the one you posted) bring me to the same page #574
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Old 16th August 2012, 05:13 PM   #6826
brianco is offline brianco  Ireland
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Jacco posted TWO apparently identical posts. The earlier one of these takes you to a different page than does the later one. The problem is the use of abbreviated links.
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Old 16th August 2012, 06:25 PM   #6827
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With copy & paste such links on the same page, you can do fun stuff with the cache memory on your PC.
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Old 16th August 2012, 09:08 PM   #6828
FdW is offline FdW  Netherlands
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Originally Posted by FdW View Post
One small update, the power supply has been fixed. And the LME49710's have been checked. To my amazement thy survived (running on +15 and -25 volts). So the big disasters is in fact not so big at all

Next I have to replace the vas-transistors and figure why I could not set bias (I di suspect one of the driver mosfets). I'l b' b'ck
Another update, it's a amplifier, the bias can be set, the gain is as expected, and (while using the 100 Watt lamp in the power supply) it can (and did) kill a 250 mW 10 Ohm resistor that posed as a loudspeaker

Tomorrow more testing with the lamp in place, and maybe a few watts of music (you see I am getting very careful (maybe a bit to )).

This is all going on very slow due to work being very demanding at the moment, but I am getting there.
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Old 16th August 2012, 09:27 PM   #6829
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Yes, building high power amps is harder then making low level stuff.
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Old 16th August 2012, 09:31 PM   #6830
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You know that i like buffers. Here is an distortion canceling design by our Dimitry :JFET Follower Amplifier Cancels Distortion
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