Search found 7 matches

by cowneko
Tue May 29, 2018 8:59 pm
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Thanks a lot Joe ;) Well, to test if the amp clips, may I use a repeated 1000hz sine signal track on the dap or better on my cd player, and look at the output (with a 50w 8R res load) with a scope to see if the sine begins to turn to square at highest volume? Also, no stability issues when bridged o...
by cowneko
Tue May 29, 2018 4:49 pm
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Image

So like this?
by cowneko
Mon May 28, 2018 2:17 am
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Well Amp finished and boxed ;) https://drive.google.com/uc?id=13W2WHEcl53nTmjkuQjWO0y3aY7zkYvTp https://drive.google.com/uc?id=1DR0ZyxzMARVAt1okD9h19g1mjNvYrxIL You may notice that a channel misses a 1000uf cap, it's because I fried one chip when doing tests (a bit of solder stuck between pins)... :...
by cowneko
Mon May 21, 2018 8:58 pm
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Thanks a lot Joe for all your advises ;)

Now the amp is working plenty good with the LXMini, the only remaining thing is that the gain is quite low (although I shorted R3 and R4 and installed a fixed 10K res in place of the trimpot).
Shall I reduce R11 to something like 470R to get more gain?
by cowneko
Fri May 04, 2018 7:57 am
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Seems like it works ;) I put 47R res across each rcas and no more AC voltage on output when no signal present :) no thump on startup or shutdown, clean sound.....cool Does the presence of those res modifies the input sensitivity in anyway or/and does it change the frequency response? I still had a s...
by cowneko
Thu May 03, 2018 6:23 am
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Well, seems like I wired then in parallel..... I've redone the wiring in serie and I don't have the voltage sag anymore, nor any DC offset on output, my bad. Thanks for pointing out my mistake. However I still have the problem of AC voltage on output until actual music signal is played. With my dap ...
by cowneko
Thu Apr 26, 2018 6:54 pm
Forum: JLM Audio Kits
Topic: 8PAKAMP & 12PAKAMP KIT BUILD THREAD
Replies: 125
Views: 190841

Re: 8PAKAMP KIT BUILD THREAD

Hi everyone, Before everything else let me introduce myself. I'm a french audio enthusiast, and i've been hooked by the DIY virus some years ago. Since then I've already build a large number of gears (Pass F5/M2/Aleph/B1, Tubelab SSE, 300B se, some lm3886 stereo amp, some AB amps, a shigaraki MKIII ...