Mic, Line, EQ... Preamps - Page 39 - diyAudio
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Old 25th December 2012, 06:56 AM   #381
mebexno is offline mebexno  Indonesia
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by schematic Apex MX1, I use to stereo to mono preamp.
I combine it with the B500. results signal sounded perfect and does not eliminate the original frequency. thanks Mile. sorry my bad english.
sir mile, should I replace the R input 22k? for better sound?
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File Type: jpg SKEMA stereoto mono.jpg (158.1 KB, 1975 views)
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File Type: jpg DSC00992.jpg (322.0 KB, 1476 views)
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Last edited by mebexno; 25th December 2012 at 07:14 AM.
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Old 28th December 2012, 07:29 AM   #382
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helo apex,
by the time i mange to get camera pls see how much ml3 i make.tnx
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Old 28th December 2012, 05:14 PM   #383
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Lightbulb My First Tube Amp

I've tried it with the specifications provided by APEX, but I have a problem on Mute / Operate Relay does not work and the red indicator lights up, if you can help me APEX? I question my view on the schematic point 4 da 5 connected goto +6.3 V and point 9 to the ground, but the PCB layout I created only 4 only connect dots and point 5 is not connected to any section. please help Mr. Mile. sorry my bad language.
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Best regards - Damanhuri
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Old 29th December 2012, 04:16 AM   #384
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hello apex do you have echo circuit for diy? can you share it?
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Old 31st March 2013, 07:37 PM   #385
wiljj78 is offline wiljj78  Philippines
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Just want to share for all diy freind may need this APEX fan control.

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File Type: jpg APEX Control Fan Green.JPG (266.8 KB, 525 views)
File Type: jpg APEX Control Fan PCB.JPG (93.3 KB, 386 views)
File Type: jpg APEX Fan Control PCB.jpg (118.2 KB, 519 views)
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Old 4th April 2013, 11:50 PM   #386
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Thank You Wil!
..been waiting for this one..

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Old 18th April 2013, 06:05 AM   #387
france is offline france  Philippines
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Default echo

echo circuit post here are ok i tried already ic pt2399
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Old 20th April 2013, 04:25 PM   #388
panggih is offline panggih  Indonesia
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anyone please help me,what is the problem with mine ML3, when pot to minimum but still audible voice?
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Old 1st May 2013, 03:51 PM   #389
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The creator of this preamplifier is known in this forum:


Originally Posted by apexaudio View Post
In this thread I will post preamps, EQ, active x-overs, VU...
ML3 is Mic/Line XLR preamp with three band EQ +/-20dB
PCB size 100x40mm
Share this preamp:
Design of Sr: TUPOLEV.
Redesign: YIROSHI
also can be found on the website of video jukebox.

stereo preamplifier


pdf format

Last edited by SERGIODS; 1st May 2013 at 04:19 PM.
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Old 8th June 2013, 04:54 PM   #390
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Dear Sergiods,
I really don't know how to thank you for this preamp post. Thanks a ton, really!!

Another very urgent and earnest request.
Could you kindly post a "ready to build" 5 band/ 6 band equalizer circuit with TLO74 etc. and a PCB layout for that?
Warm regards, Som
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