Mic, Line, EQ... Preamps - Page 29

ravpreet420 · 31st July 2011, 12:27 PM

Hi apexaudio
Plz post schematic of
Balanced line input with low cut 12dB/oct at 35Hz

Ivchikx · 18th August 2011, 07:01 AM

On ML3 these tone control pots (bass, middle, treble), can I use pots with center point? With all tone pots turned to center position, sound should be unchanged, e.g. same as from source?

Ivchikx · 9th September 2011, 03:24 PM

UPDATE: Just finished one pair of ML3 for TDA7294 amp and works like a charm. Big thanks, Apex.

formula 22 · 06:50 AM

Hi
I need a diagram and PCB for an active filter for the subwoofer amplifier: "Quasi amplifier for beginners" (of APEX Audio).
Regulated frequency of 40...120 Hz with a slope of 12...18dB.
This preamplifier that can directly to be connected to output to my stereo amplifier.

Thanks for your help

irwanks · 10:39 AM

Hi apex. I have made apex ml3 pcb. This is the result. Quality is good enough. But i had a little hum, but when i touched the casing of my amp, hum was disappear. Can you give me any advice for it. How to wiring apex ml3 correctly? I just used simple regulated power supply. Thank you very much.

apexaudio · 1st November 2011, 11:55 AM

Quote:

Originally Posted by irwanks

Hi apex. I have made apex ml3 pcb. This is the result. Quality is good enough. But i had a little hum, but when i touched the casing of my amp, hum was disappear. Can you give me any advice for it. How to wiring apex ml3 correctly? I just used simple regulated power supply. Thank you very much.

You must grounded your case (gnd from regulated psu connect to amp case)

irwanks · 2nd November 2011, 01:46 AM

Quote:

Originally Posted by apexaudio

You must grounded your case (gnd from regulated psu connect to amp case)

Thank you very much for your quick reply

Endik · 12th December 2011, 08:29 AM

Quote:

Originally Posted by apexaudio

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
Regards

Mr Mile,

Can you share pcb lay out in pdf format?

How to make this preamp to 4 adjustable potensio (high, mid, freq and low)?

regards
Endik

engel dela pena · 31st December 2011, 07:31 AM

apex,
please help how to put balance pot ,
i will use ML3 as multiple input maybe 4 or up ML3 and feed it to MX1,
i just hope your help of adding a balance pot to assign left/right to MX1 as master and ML3 as multiple input,
hope you help

Endik · 31st December 2011, 09:12 AM

Thank you Mr. Mile,
This is my ml3 sound ok but i will add 1 potensio for mid low freq,
can some one help me?
Thank you
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23rd September 2011, 06:34 AM	#284
formula 22 diyAudio Member Join Date: Sep 2011 Location: El Triunfo	Schematic for preamplifier for sabwufer Hi I need a diagram and PCB for an active filter for the subwoofer amplifier: "Quasi amplifier for beginners" (of APEX Audio). Regulated frequency of 40...120 Hz with a slope of 12...18dB. This preamplifier that can directly to be connected to output to my stereo amplifier. Thanks for your help Last edited by formula 22; 23rd September 2011 at 06:50 AM. Reason: Schematic fo preamplifier for subwoofer

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31st July 2011, 12:27 PM	#281
ravpreet420 diyAudio Member Join Date: Oct 2009	Hi apexaudio Plz post schematic of Balanced line input with low cut 12dB/oct at 35Hz

18th August 2011, 07:01 AM	#282
Ivchikx diyAudio Member Join Date: Feb 2011 Location: Baldone, Latvia	On ML3 these tone control pots (bass, middle, treble), can I use pots with center point? With all tone pots turned to center position, sound should be unchanged, e.g. same as from source?

9th September 2011, 03:24 PM	#283
Ivchikx diyAudio Member Join Date: Feb 2011 Location: Baldone, Latvia	UPDATE: Just finished one pair of ML3 for TDA7294 amp and works like a charm. Big thanks, Apex.

31st December 2011, 09:12 AM	#290
Endik diyAudio Member Join Date: Oct 2010 Location: Balikpapan	Thank you Mr. Mile, This is my ml3 sound ok but i will add 1 potensio for mid low freq, can some one help me? Thank you ImageShack® - Online Photo and Video Hosting