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Old 6th October 2012, 08:52 PM   #531
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Carl, the metal back of the MJE - drivers is connected to the collector of the drivers!
You must therefore completely isolate the drivers from the ALU - L- profile.

Best regards - Rudi_Ratlos
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Old 6th October 2012, 09:28 PM   #532
cjkpkg is online now cjkpkg  United States
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Old 6th October 2012, 09:44 PM   #533
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Carl, you can use a shrinking-hose, a polyamide-screw, ...

Best regards - Rudi_Ratlos
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Old 7th October 2012, 12:08 PM   #534
cjkpkg is online now cjkpkg  United States
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progress....boards are stuffed and L profiles are tapped. need to get some small screws to mount the mje's.
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Old 9th October 2012, 09:46 PM   #535
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Carl, I received the ordered thermally conductive foil this morning and finished the 1st channel of my SYMASYM.

I adjusted the quiescent current / bias to 26mV voltage drop across 2 emitter resistors (between MP1 and MP2).

The DC offset is very, very small (< 1mV).

I tested the channel using a 8 Ohm / 80W resistor and played back some sine and square-wave tracks at 16 VAC amplitude. No problem.

If I have some time tomorrow (but I believe that I will receive the FC-100 group-buy PCBs in the morning), I will try and finish the 2nd channel.

What about your build?

Best regards - Rudi_Ratlos
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File Type: jpg SYMASYM 001.jpg (242.5 KB, 352 views)
File Type: jpg SYMASYM 008.jpg (176.8 KB, 327 views)

Last edited by Rudi_Ratlos; 9th October 2012 at 09:55 PM.
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Old 11th October 2012, 08:49 PM   #536
cjkpkg is online now cjkpkg  United States
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Nice!

I have been traveling for work a lot lately and have not done much this week.

I received my TO-220 mounting hardware with the shoulder washers today so maybe this weekend I will make some good progress.
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Old 11th October 2012, 09:40 PM   #537
brianco is offline brianco  Ireland
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@Rudi,

Nice pics as usual. The cleanliness and tidiness of your workbench is frightening......but you have the saving human grace of smoking AND of being not very careful with the cigarette!
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Old 13th October 2012, 03:52 PM   #538
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If I am using a preamp do I put a jumper wire across the jumpers or not?

there is an excerpt in the manual that is confusing as to whether the cap multiplier is enabled with the use of a jumper or not.

By jumper I mean soldering a wire across the jumper.
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Old 13th October 2012, 06:11 PM   #539
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Carl,

you are talking about 2 different things.
I explained in post #450 what to do (which resistor values to use), in case you connect the SYMASYM to a pre-amplifier.

The cap-multiplier has nothing to do with this. It simply "smoothes" the power-rail for the frontend.
If you do not want to have it this way, just put a shorting bar across Jumper 1 + 2.

Best regards - Rudi
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Old 13th October 2012, 07:54 PM   #540
cjkpkg is online now cjkpkg  United States
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OK got it all wired up. One channel checks out and the other channel goes runaway.

One thing I forgot to insulate the bd139. If I fried one of them would that cause a runaway as in the potentiometer does nothing and I measured up to 900 mv before I was able to switch it off.

Ugh...
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