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Old 4th May 2012, 01:17 PM   #181
MrSlim is offline MrSlim  Canada
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This document is the basis for the LXXD designs from ljmljm (l15,l20,l25). He simplified the design(removed the over/under voltage protection), but the basic circuit is the same. Page 37 describes the differences between the suggested versions. The L15D is equivalent to the Amp7s-150, and you likely want something like the AMP7S-100, which you can get by changing the various resistors, to adjust the operating point of the amp. Unfortunately there are no schematic diagrams, of ljmljm's designs, so you have to figure out which resistors you need to change. Someone has identified the components numbers for the L25, but its a slightly different board layout, so you'll have to do it yourself (I was planning on doing it for the L15 myself, but havent had time yet).
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Old 4th May 2012, 01:56 PM   #182
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Maybe I'll be forced to use something else. I don't have the knowledge to do that modification. My focus is designing folded bass horn boxes with rear firing back loaded and tractrix front loaded for the woofers so they have a chance to keep up with the 811 horns without padding the horns. As these projects do, it evolved. Now into a bi-amping design using the Minidsp. I suppose I can build a generous equipment bay into the box and leave room to start out with a cheapy and then after it's going, maybe I'll figure a way to get something higher quality in there.
hanks for the response.
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Old 11th May 2012, 05:55 PM   #183
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Idefixes View Post
I just finished to solder L15D LJM kit, will test it next few day

Click the image to open in full size.

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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
Is .22 UF can choose to use a larger capacity .22-68UF.

I have been using the Fujitsu OSCON capacitors. It is very good. I use 20V22UF.L15D, L15DX2 on.
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Old 11th May 2012, 05:59 PM   #184
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by chanfh View Post
Hi LJM,

I have a pair of L15 which I've used it for a few months. Its power supply is a 33.6-0-33.6 Transformer with 10,000uF filter capacitor.

I'm wondering if I could further increase the Gain because as compared to my EL34 tube amp, its volume is softer which I have to crank up my PC's volume before it can match my tube amp.

Reading from the IRAUDAMPS7S data, its possible to adjust the value or R7 which is a 3.01K resistor. Is this the same for your L15?

If not, which resistor of what value is it responsible for its gain in the L15?

Thanks.
The L15D amplification gain is about 36 times. About can increase the 120K resistor. Gain to improve.

I suggest to add a preamp can add an op amp gain.
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Old 11th May 2012, 06:01 PM   #185
ljm_ljm is offline ljm_ljm  China
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Originally Posted by dudaindc View Post
ljm_ljm

Where can I get that?

L15DX2 Full Bridge mode
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Old 11th May 2012, 06:06 PM   #186
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Hawaiiman View Post
Apologize if this is covered elsewhere, I couldn't find. I want to use a pair of L15D per side as bi-amp controlled by Minidsp unit. My old speakers were rated 60w max new. I'd like to avoid adding a pot, as I will have master volume in the dsp and can pad if necessary there too. If I supply a lower voltage..say +25 or so, will that limit the output to 50w peak? If so will L15D still work ok? The lowest distortion area of L15D is 5-35w, right where I want to run them.-Thanks
L15D can not be less than less than +-35V.
If you do need to +-25V I recommend using the TA2022??, LM4766??

Perhaps they are more simple.
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Old 12th May 2012, 01:46 AM   #187
chanfh is offline chanfh  Malaysia
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Quote:
Originally Posted by ljm_ljm View Post
The L15D amplification gain is about 36 times. About can increase the 120K resistor. Gain to improve.

I suggest to add a preamp can add an op amp gain.
Thanks LJM. Currently I placed a TL072 preamp before the L15D using a non-inverting config. The set again is 2.5X only but I have a fairly loud hiss coming from the output. If the input of the preamp is not connected, it's gives out a audible hum at the output. Any idea why?

Thanks!
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Old 13th May 2012, 01:14 PM   #188
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by chanfh View Post
Thanks LJM. Currently I placed a TL072 preamp before the L15D using a non-inverting config. The set again is 2.5X only but I have a fairly loud hiss coming from the output. If the input of the preamp is not connected, it's gives out a audible hum at the output. Any idea why?

Thanks!
Cancel the pre-amplifier. If there is no noise, the noise is generated by the pre-amp.

Preamplifier noise is likely to occur..

Or short circuit L15D signal input IN INGND. If there is no noise.

Description of noise generated by the input signal.
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Old 13th May 2012, 03:09 PM   #189
chanfh is offline chanfh  Malaysia
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Thanks LJM for the advice. Its working fine now.

I didn't need the preamp after all. My problem was I plugged into the wrong source where it has a 10K resistor across the line level. Now its working great with a 10000uf rectifier at a Vs of 46V.

It's a great amp board with very minimal heat.

Cheers!
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Old 17th June 2012, 02:47 PM   #190
ljm_ljm is offline ljm_ljm  China
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Can use this circuit level before the match
It can be a good and L15D L20 D and D match up

As four times as much amplification. Have a minimal noise value.


Won't hear.
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