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Distinction-1541 v2 complete PCB interest list
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Old 5th April 2018, 09:31 AM   #111
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by sthcoaster View Post
Another question - looking ahead to making the CCS

- I see that you have test points on the V2 board for -15, +5, -5. Is it possible to draw current from these for the CCS?

else I'm up for another two psu/regulators to join the 26v and 8v for the DAC, 18v for each channel of SEN I/V, 2 x 5v for receiver

cheers
Yes, you can do this, that's one of the reasons I put them there. Im taking 4mA from the +5V supply for my CCS. If you use the -5V just be aware that i've labeled it backwards, GND and -5V should be swapped around. Also note that the more current you take from these supplies the more you are effectively increasing the output impedance, but a few mA shouldn't hurt it much.
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Old 6th April 2018, 01:02 AM   #112
sthcoaster is offline sthcoaster  New Zealand
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Quote:
Originally Posted by ryanj View Post
Yes, you can do this, that's one of the reasons I put them there. Im taking 4mA from the +5V supply for my CCS. If you use the -5V just be aware that i've labeled it backwards, GND and -5V should be swapped around. Also note that the more current you take from these supplies the more you are effectively increasing the output impedance, but a few mA shouldn't hurt it much.
Thanks. Very convenient.
separate CCS for each channel right?
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Old 6th April 2018, 09:57 AM   #113
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Quote:
Originally Posted by sthcoaster View Post
Thanks. Very convenient.
separate CCS for each channel right?
Yes, a separate 2mA ccs for each channel.
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Old 4th May 2018, 12:43 PM   #114
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Default FFT of Cap MX

Hi All,

Just been playing around in the shed trying to get some meaningful measurements from the cap MX circuit I posted in post #101. (attached here also)

I injected 1V RMS signal sweep from 100hz to 1Mhz into the input of the circuit.

Circuit under test was powered from a DC source with a load attached.

The filter cap (C1) was removed for the test as it provided an impedance way too low for the amplifier I was using to handle, I think I had about 11ohm zout.

The attached image shows the levels measured at various points in the circuit.
A - Signal sweep input (where C1 was)
B - C6
C - C7 and C4 had very similar levels.
D - This is the noise floor of the measuring system with the settings I had on. It was also the same output level as when the circuit under test was being powered by the rectifier with the filter cap in place.

When you consider these measurements plus a 2200uF filter cap added to the start of the circuit, it seems to have quite an ample amount of Noise/Ripple rejection before the Voltage reg/CCS of the D2 PCB.

Ill give it a bit more thought but i've already started laying out a PCB so if anyone's interested in one just start a list in this thread. eg: "ryanj x 1 capmx pcb" and ill get a few extras made up.

These measurements are obviously a fairly amature attempt, but it at least gives some indication of what is going on in the circuit.

Ryan.
Attached Images
File Type: jpg capmultiFFT.jpg (207.9 KB, 106 views)
File Type: jpg neg pos cap multi reg trans.jpg (130.7 KB, 100 views)

Last edited by ryanj; 4th May 2018 at 12:46 PM.
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Old 8th May 2018, 11:05 AM   #115
ryanj is offline ryanj  Australia
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Default LM317 PSSR Comparison

Hi All,

After testing the Cap MX I was a little curious how the LM317 would fare under similar circumstances.

Very similar test setup as the Cap MX, same load, same voltage drop and no input cap. I didn't quite get the same input signal sweep voltage of 1V RMS in to the circuit due to amplifier limitations, so just take note of the difference between the input(top) and output(bottom) FFT.

Overall it looks like the LM317 does well in the high frequencies but not so well in the lower/audible range.

Ryan.
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File Type: jpg LM317 comparison.jpg (172.1 KB, 71 views)
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Old 15th May 2018, 01:18 AM   #116
sthcoaster is offline sthcoaster  New Zealand
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Quote:
Originally Posted by sthcoaster View Post
I notice all your suggestions for PSU utilise a CT and half rectifiers. I've got 2 X 12 so will put them in series and run into a full rectifier. and I worry because now you are going to tell me how that will not work or be a bad idea.
Hello again

Am I correct thinking that if I apply your schematic for the 24v PSU to a full rectification I omit the PNPs etc on the negative rail?

Also I am confused generally with transformers eg. 24CT could be made using 2 x 12v windings given the right trafo - correct? you dont use 2 x 24v to make 24ct because that would give 48vCT. I need to have a closer look at my transformer to see what is possible (I'm currently away from home)

Received some parts this week courtesy of a colleague who was travelling out of the US - had them delivered to his as he was coming my way to attend a training event but he was only travelling with carry-on and got hassled at security travelling through Qatar - I had not anticipated that a couple of transformers, pin connectors, common mode chokes and cable glands would cause issue - no sharps, no liquids etc. - stuff I expect you would see in carry-on normally as people carry power supplies for their laptops etc. (just not as individual parts) thankfully they let it pass.

Expecting additional parts to arrive any day now so that I can get on with this - I have started hand milling pcbs using an engraving bit set to depth on the drill press of my rotary tool and am reasonably happy with the results on simple boards for PSUs and a TDA1543 project (parallel and single). I also note that ECdesigns has made new design suggestions on the "ultimate NOS dac" thread using 14X 100uf coupling caps - might play with that to.

Too many projects, too little time.
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Old 15th May 2018, 10:56 AM   #117
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Hi Clayton,

Quote:
Am I correct thinking that if I apply your schematic for the 24v PSU to a full rectification I omit the PNPs etc on the negative rail?
You dont need to omit the PNP darlington if you use 4 diodes and a single 24V winding, it will work pretty much the same except you'll get the voltage drop of the extra diode in the current path. Which won't be very much if using schottky diodes.

Quote:
Also I am confused generally with transformers eg. 24CT could be made using 2 x 12v windings given the right trafo - correct? you dont use 2 x 24v to make 24ct because that would give 48vCT.
Yep that's right.

Quote:
Received some parts this week courtesy of a colleague who was travelling out of the US - had them delivered to his as he was coming my way to attend a training event but he was only travelling with carry-on and got hassled at security travelling through Qatar - I had not anticipated that a couple of transformers, pin connectors, common mode chokes and cable glands would cause issue - no sharps, no liquids etc. - stuff I expect you would see in carry-on normally as people carry power supplies for their laptops etc. (just not as individual parts) thankfully they let it pass.
Doubt they even new what they were. Probably not something they see much as they are normally covered by a plastic case. Good you ended up getting them anyway.

Quote:
I also note that ECdesigns has made new design suggestions on the "ultimate NOS dac" thread using 14X 100uf coupling caps - might play with that to.
Yeah I saw that. Running the DEM at 50Hz means each sample is not going to get the same bit current averaging. Maybe in doing this he is basically saying that the DEM does more damage to the internal timing circuit than it does good. It may be a case of choosing the approach that causes the least
amount of damage to the final output signal.

Quote:
Expecting additional parts to arrive any day now so that I can get on with this - I have started hand milling pcbs using an engraving bit set to depth on the drill press of my rotary tool and am reasonably happy with the results on simple boards for PSUs and a TDA1543 project (parallel and single).
You're a real diyer! The "Toner transfer method" for making PCBs was my favorite. I wouldn't mind getting a CNC router to make PCBs, would cut out the waiting time getting them from a board house when making prototypes.

Ryan
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Old Yesterday, 11:45 AM   #118
ryanj is offline ryanj  Australia
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Hi guys,

Attached is a schematic of the cap MX circuit that I ended up with after testing. Also attached a basic ripple rejection graph of the measurements I took.

The previous measuring setup I had (Virtins multi-instrument) seemed to give me differing results each time, so I used my scope instead using a differential measuring technique. Here's a link to one of Dave Jones videos that describes the technique I used: YouTube

Test setup was the same as before but using my scope to analyse the waveform instead.

I had a short listen to my system with this circuit in place and its sounding like i've gained some improvement in sound quality, Ill have a better listen soon.
Attached Images
File Type: jpg PSRR.jpg (199.9 KB, 30 views)

Last edited by ryanj; Yesterday at 12:06 PM.
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