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Reckhorn Mini-Sub
Reckhorn Mini-Sub
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Old 3rd December 2017, 04:27 PM   #11
Baldin is offline Baldin  Denmark
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Default Pre-amp

The small preamp up and running.
2. order high pass 25 Hz slightly peaking with ca +3 db
Variable 2. order lowpass filter 37,5 Hz - 154,5 Hz
Volume control
One dual opamp (TL072 just for trial)
Simple regulator based on BD139/BD140
All with through hole components, so that anybody can solder it

PCB ... hmmm 2 errors .... missing connections ..... forgotten to run a design rule check!! .... easy to correct, and have made a v2 of the PCB files
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File Type: jpg IMG_4930.jpg (626.1 KB, 268 views)
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Old 3rd December 2017, 06:16 PM   #12
bjorno is offline bjorno  Sweden
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Hi All,

FYI:

b
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Old 5th December 2017, 03:47 PM   #13
Baldin is offline Baldin  Denmark
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Hi bjorno
Thanks. Guess quite impressive for 2 x 6.5", but a tapped horn sort of defeats the purpose: "Mini Sub" ... good input anyway
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Old 9th December 2017, 08:32 AM   #14
Baldin is offline Baldin  Denmark
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Hi bjorno
I'm not a Hornresp user ... yet ... have installed version 42.40, and I do not see the "Lossy tapped horn wizard" .... What am I missing?

Was thinking of modeling something near to a slot vented system, but with the drive playing into the slot ....
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Old 9th December 2017, 09:02 PM   #15
GM is offline GM  United States
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In Help/Hornresp Help/Find/File/Find, input 'lossy' and it will take you to it.

Basically, you change Le, then do your design or to see how it affects an existing one.

GM
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Old 10th December 2017, 10:13 AM   #16
Baldin is offline Baldin  Denmark
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Thanks GM
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Old 10th December 2017, 10:41 AM   #17
Baldin is offline Baldin  Denmark
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Default Pre amp ... free use of design, non commercial

For those interested, here is schematics and gerber files ready for use, for non commercial purposes of course. I have corrected the two small mistakes, so should work perfectly.
Can be powered from the AMP PSU you use directly (must be a split supply with a positive and negative and a GND, of course).

I lately use Elecrow for pcb's:
PCB Prototyping - Order Online, Fast Shipping • Elecrow PCB
5 pcs for 5 USD + shipping .... I can't send 1 pcs from here to anywhere for less than you'll be able to order these 5 pcs!!!
It is dead easy, just upload the zip file and do the order.

Gerber files can be checked her if in doubt:
Free online gerber viewer in safe way!!
Just drag and drop the zip file. .... pretty smart

Schematics should be straight forward. Input pot needs to be Log and Xover Freq should be lin. Chose through hole components to make it easy for anyone to assemble.

For mounting on a back plate, use the pots, but I also made a hole in the PCB wher you can attach a smal metal brace which can also double function as a heat sink for the two transistors.
I'll show later.

For the input highpass filter, you can calculate other values here:
Multiple Feedback High-pass Filter Design Tool
I chose 25 Hz with a small peak of +2 and +4 db. Really easy to calculate for other freq and more or less peak
Attached Files
File Type: pdf Mini Sub II Schematics.pdf (188.4 KB, 52 views)
File Type: zip Project Outputs for Mini Sub II.zip (23.0 KB, 15 views)
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Last edited by Baldin; 10th December 2017 at 10:44 AM.
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Old 17th December 2017, 04:50 PM   #18
Baldin is offline Baldin  Denmark
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Default Simple spider

Made a very simple spider of a nylon string. Made two smale holes in chassis top and bottom through which I mounted the string. made a single loop arounf the center screew and ajusted it so that it will keep the diaphragm from sagging.
Now mounted with 200 g extra weight on each passive, which is of course a lot for such a small unit, but now it is tuned to 25 Hz ... nice.
Plays really well

PS. Running on my latest 200W class d amp...
Attached Images
File Type: jpg IMG_4946.jpg (742.1 KB, 189 views)
File Type: jpg IMG_4945.jpg (950.7 KB, 75 views)
File Type: jpg Impedans m 200g.JPG (165.2 KB, 75 views)
File Type: jpg IMG_4947.jpg (952.7 KB, 84 views)
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Last edited by Baldin; 17th December 2017 at 05:06 PM.
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Old 10th February 2018, 07:48 AM   #19
Baldin is offline Baldin  Denmark
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Just a small update on the project.

The sub still plays well, and the nylon string spider works amazingly fine. No sagging on the pasives

The amp is tested quite some more and delivers around 200W into 4 ohm without cooling.
The sub maxes out around 150W, and it is still amazing how much sound it can put out. Easily enough for the use as a sub with my PC / home office setup

Next step is to make the amp into a plate amp and install it.
Right now I'm using a Connex 240W SMPS (SMPS240QR +-40Vdc). It's a really nice small PSU 50x100mm but a bit expensive at 50USD.
Have bought a larger but cheaper SMPS on ebay:500W +/-70V High-power PSU Audio Amp Switching Power Supply Board Amplifier | eBay
Haven't tried it out yet, but it is much larger 135x100mm and 40mm in hight. It should be able to deliver 500W, which is of course double up, but also more then needed for this project, so will stay with the smaller Connex type.
Instead of my homegrown Class-D I would reccommend something like this for the project:
IRS2092 CLASS D Audio Power Amplifier AMP Kit 200W MONO Assembled Board UK | eBay
Have tried one out but not put it to the limit ... but component choise seems quite good, only the input cap, where a ceramic cap is used leaves much to be desired .... and it is dirt cheap.

Stay tuned
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Old 10th February 2018, 03:24 PM   #20
bjorno is offline bjorno  Sweden
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Default Reckhorn D-165 Driver measured T/S?

Hi Baldin,

Good work as usual! I looked back at my Bin for the Reckhorn D-165 Driver and found more of 'defeating the purpose' . but made me wondering of the Driver T/S: Do you have measured Parameters?

b
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