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.
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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+ -35V it is too low.
proposed voltage AC 35-0-35 Transformer Rectifier filter + -50VDC
You need to pay attention to the following.
L7 needs more than 500 grams of aluminum radiator. And the installation of insulation.
Do not change the original parts.
L7 matching parts is very stable. And the strict test.
PCB the above detailed numerical. I never watch circuit installation.
I think watching circuit is really a thing too much trouble. Or PCB directly
Maybe you should check your radiator.
One method I often use. The power input.
110V or 220V end, connected in series with a light bulb.
It can effectively prevent circuit burned. The reason there is enough time to examine the problem.
L7 can use the voltage in the + -70V. The premise is that it requires 1KG aluminum radiator.
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.
Hello Marc, what has become from it?
I just finished to solder L15D LJM kit, will test it next few day
I swap all elko to Panasonic Fc and increase the 220µF to 390µF. I also soldered 220nF decoupling cap on 22µF and 10µF
Marc
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
regards
Thanks Ljm ,
Enjoying 5 of your L15D's every day ! great Amps and sound !
Cheers ,
Rens
I like them very much. I've already build the gainclone and I can say it's a very good amplifier. Now tell me please between L7 and L15 mosfet which one do you (LJM_LJM) prefere?
Thanks and RGDS.
PEMO
Thanks and RGDS.
PEMO
Do you want to ask about the L15 how to choose?
They are very good. The principal is a different volume.
If you want to make a small machine used just about
I can send DHL. But the postage to call ask.
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
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
Do you have a speaker connected ?
The 2092 will sit at +17VDC if no speaker is connected.
I sold one and the customer flipped his lid at the 17 VDC on the output with no speaker connected. Said he daren't connect a speaker.
I said that it was fine and that the 2092 needed a load to work properly.
SO he connected a speaker and it was fine.
The 2092 will sit at +17VDC if no speaker is connected.
I sold one and the customer flipped his lid at the 17 VDC on the output with no speaker connected. Said he daren't connect a speaker.
I said that it was fine and that the 2092 needed a load to work properly.
SO he connected a speaker and it was fine.
Hi, Yes there is +1V with either speaker or 4.7R load on output, have connected to stereo system, only one channel working fine. the other just protects itself and speaker by switching off relay on output after some noise and cone flap..
Mark
Mark
All sorted, sounding good, it was a dry joint on one resistor near one of the IRF14019's, could not see it until i scrubbed the board with cleaner and then needed a X10 eye class to find it. First dry joint in over 40 years of soldering, Ha Ha and I was worried about the IRS2092 SMD, that was the easy bit as it turn out. Impressed with the no signal input stoney silence...
Cheers
Mark
Cheers
Mark