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Old 14th July 2013, 12:53 PM   #231
drahcir is offline drahcir  Philippines
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just recently received my L15D-Pro kit and after building it connected to my +-35v transformer using the power supply board with speaker protection also design by LJM, initial test and im quite impressed with the SQ knowing that the price is a bargain,my next project would be an aikido preamp to be used with this amp and see if its a good match for my fullrange array speaker.
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Old 12th August 2013, 10:58 PM   #232
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Some pictures of the L15D-PRO diy assembly kit from Zoe. No documents packaged with kits but still very straight forward to assemble. Pics of completed project to follow later.

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Old 16th August 2013, 02:59 PM   #233
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by drahcir View Post
just recently received my L15D-Pro kit and after building it connected to my +-35v transformer using the power supply board with speaker protection also design by LJM, initial test and im quite impressed with the SQ knowing that the price is a bargain,my next project would be an aikido preamp to be used with this amp and see if its a good match for my fullrange array speaker.
+ -35V it is too low.
proposed voltage AC 35-0-35 Transformer Rectifier filter + -50VDC
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Old 17th August 2013, 01:13 AM   #234
drahcir is offline drahcir  Philippines
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Quote:
Originally Posted by ljm_ljm View Post
+ -35V it is too low.
proposed voltage AC 35-0-35 Transformer Rectifier filter + -50VDC


sorry its 35-0-35vac before rectification.
my transformer is rated at 6amps do you think its sufficient enough for a stereo setup or im better with mono-mono?2 transformer 35-0-35vac 6amps of course using 2 power supply board.
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Old 19th August 2013, 02:52 PM   #235
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by drahcir View Post
sorry its 35-0-35vac before rectification.
my transformer is rated at 6amps do you think its sufficient enough for a stereo setup or im better with mono-mono?2 transformer 35-0-35vac 6amps of course using 2 power supply board.
Very good.
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Old 3rd January 2014, 10:31 AM   #236
JUS is offline JUS  Germany
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Default Hello Marc, what has become from it?

Quote:
Originally Posted by Idefixes View Post
I just finished to solder L15D LJM kit, will test it next few day

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I swap all elko to Panasonic Fc and increase the 220F to 390F. I also soldered 220nF decoupling cap on 22F and 10F

Marc
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Old 13th February 2014, 10:06 AM   #237
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hi ! just bought a IRS2092 IRAUDAMP7S stereo, one board. Just want to know if I can choose a connexelectronic SMPS500R for power supply ? a +/- 55v is it ok ? About the volume potentiometer a ALPS stereo RK27 will be ok ? in 10, 50, 100 ohms ? I use a maverick Audio dac D1. Thanks a lot to help me !
regards
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Old 22nd February 2014, 01:44 PM   #238
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by loupanchot View Post
hi ! just bought a IRS2092 IRAUDAMP7S stereo, one board. Just want to know if I can choose a connexelectronic SMPS500R for power supply ? a +/- 55v is it ok ? About the volume potentiometer a ALPS stereo RK27 will be ok ? in 10, 50, 100 ohms ? I use a maverick Audio dac D1. Thanks a lot to help me !
regards

IRAUDAMP7S Use the recommended + - 55 v
ALPS 27 use 20k-100k
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Old 22nd February 2014, 02:49 PM   #239
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Quote:
Originally Posted by ljm_ljm View Post
IRAUDAMP7S Use the recommended + - 55 v
ALPS 27 use 20k-100k
Thanks Ljm ,

Enjoying 5 of your L15D's every day ! great Amps and sound !

Cheers ,

Rens
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If you measure, you know; if you guess, you don't
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Old 9th March 2014, 09:23 PM   #240
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Default New pro build protection kicks in on startup

Have just put together 2 L15D pro boards, went together nice and easy, on test one works fine, the other switches on makes a noise through speakers then relay switches out, best I can see is a large dc appears on output before relay does it's thing. I am still testing, but can't see anything wrong. Any ideas much appreciated......

PSU +- 50v, test load 4.7R or speaker, inputs shorted.
Frequency seems to be 460Khz on one that works and 570Khz on non-working one.....

Cheers Mark
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