AC/DC & POWERSTATION KIT BUILD THREAD
Moderator: Joe Malone
Re: AC/DC & POWERSTATION KIT BUILD THREAD
Joe,
I forgot to mention that I would like to have:
48V Phantom
+24V for the Micpres (2 x EZ1290)
+/-18V for two LED VU meter just 4 LEDs each
What transformer would you suggest?
Thanks
Eric
I forgot to mention that I would like to have:
48V Phantom
+24V for the Micpres (2 x EZ1290)
+/-18V for two LED VU meter just 4 LEDs each
What transformer would you suggest?
Thanks
Eric
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Hi Joe,
For the last year I've been working on an 8 channel mic pre with AD/DA capability. It's basically an Amek Angela / M1000 mic pre front end, with a AD8000 back end.
The voltages required are +/-17v, 5v and 48v. I'm using a Powerstation and a 2x18v 50VA supply.
The concern is the 5v, and having to turn it down from 18v. It generates a LOT of heat at the V2+ heatsink.
In the AD8000, they have a +/-18v power supply with a separate 5v winding, which I cannot find anywhere. Thus I went for the Powerstation & 2x18v Toro.
Is the heat shedding typical when turning down to 5v, or would you think I've over speced the transformer... 50VA
Cheers,
Anthony,
For the last year I've been working on an 8 channel mic pre with AD/DA capability. It's basically an Amek Angela / M1000 mic pre front end, with a AD8000 back end.
The voltages required are +/-17v, 5v and 48v. I'm using a Powerstation and a 2x18v 50VA supply.
The concern is the 5v, and having to turn it down from 18v. It generates a LOT of heat at the V2+ heatsink.
In the AD8000, they have a +/-18v power supply with a separate 5v winding, which I cannot find anywhere. Thus I went for the Powerstation & 2x18v Toro.
Is the heat shedding typical when turning down to 5v, or would you think I've over speced the transformer... 50VA
Cheers,
Anthony,
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Yes the heat is normal when turning down this far as our calculator link below will show youhorizonsound wrote:Hi Joe,
For the last year I've been working on an 8 channel mic pre with AD/DA capability. It's basically an Amek Angela / M1000 mic pre front end, with a AD8000 back end.
The voltages required are +/-17v, 5v and 48v. I'm using a Powerstation and a 2x18v 50VA supply.
The concern is the 5v, and having to turn it down from 18v. It generates a LOT of heat at the V2+ heatsink.
In the AD8000, they have a +/-18v power supply with a separate 5v winding, which I cannot find anywhere. Thus I went for the Powerstation & 2x18v Toro.
Is the heat shedding typical when turning down to 5v, or would you think I've over speced the transformer... 50VA
Cheers,
Anthony,
http://www.jlmaudio.com/ACDC%20Calculator.htm
The calculator will tell you if you heatsink is big enough to keep the regs cool enough.
But I can tell you small separate heatsinks will not be enough for the 5v.
Best to bolt all the regs to the side of the metal case with there insulating kits directly to the case or with a piece of L aluminium.
Once the 5v reg has enough heatsink it will be fine.
Joe
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Thanks Joe.
To put it to the theory test, I measure 37.7ohms over GND to +5v when the psu is removed.
5v / 37.7ohms is 0.133A, which requires massive heat dissipation.
17v rails measure about 660k, therefore about 1A.
Could have used a 30VA transformer.
My theory could be wrong. It's about time I learned it though.
To put it to the theory test, I measure 37.7ohms over GND to +5v when the psu is removed.
5v / 37.7ohms is 0.133A, which requires massive heat dissipation.
17v rails measure about 660k, therefore about 1A.
Could have used a 30VA transformer.
My theory could be wrong. It's about time I learned it though.
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
This test is with no semiconductors actually turned on. So the current draw will be a lot higher than the ohms would suggest.horizonsound wrote:Thanks Joe.
To put it to the theory test, I measure 37.7ohms over GND to +5v when the psu is removed.
5v / 37.7ohms is 0.133A, which requires massive heat dissipation.
17v rails measure about 660k, therefore about 1A.
Could have used a 30VA transformer.
My theory could be wrong. It's about time I learned it though.
Also not sure how 17v / 660k = 1A?
Easiest way is to put 1 ohm in series with each rail and measure the voltage drop across the 1ohm as then I = V
Joe
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Hi Joe,
just built this the 3 rail PSU.
What a nice designed PSU, love it.
I would like to ask you some technical questions,
what is reason for the 10ohm resistor and 0.1uf caps that are on the board that connect 0V on the PSU to Case ground?
Is this some kind of filter?
Also, I needed 1,5 amps so I soldered the 4 extra diodes under the pcb, why are these extra resistors needed?
LM317 and LM337 can both supply 1,5amps, so wheres the limitation of 1 Amp? is at the 1N4007 diodes themselves?
if thats the situation why did you choose to design this PSU with the 1N4007 diodes instead of using an 1,5amp rated Bridge Rectifier?
just built this the 3 rail PSU.
What a nice designed PSU, love it.
I would like to ask you some technical questions,
what is reason for the 10ohm resistor and 0.1uf caps that are on the board that connect 0V on the PSU to Case ground?
Is this some kind of filter?
Also, I needed 1,5 amps so I soldered the 4 extra diodes under the pcb, why are these extra resistors needed?
LM317 and LM337 can both supply 1,5amps, so wheres the limitation of 1 Amp? is at the 1N4007 diodes themselves?
if thats the situation why did you choose to design this PSU with the 1N4007 diodes instead of using an 1,5amp rated Bridge Rectifier?
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Coolwhoops wrote:Hi Joe,
just built this the 3 rail PSU.
What a nice designed PSU, love it.
It is used to stop ground loops happening. Isolates the chassis ground from the audio ground by 10R with 0.1uF across it so no RF gets in as well.I would like to ask you some technical questions,
what is reason for the 10ohm resistor and 0.1uf caps that are on the board that connect 0V on the PSU to Case ground?
Is this some kind of filter?
I don't know what extra resistors you mean or do you mean diodes? 1N4007 are 1Amp diodes which is perfect for 99% of the power supply uses. They are needed on the PCB for other protection diodes roles so make perfect sense to use them for everything so there is less parts confusion when building the kit. Remember to get to 1.5A per rail you will need very good large heatsinking of the regulators.Also, I needed 1,5 amps so I soldered the 4 extra diodes under the pcb, why are these extra resistors needed?
LM317 and LM337 can both supply 1,5amps, so wheres the limitation of 1 Amp? is at the 1N4007 diodes themselves?
if thats the situation why did you choose to design this PSU with the 1N4007 diodes instead of using an 1,5amp rated Bridge Rectifier?
Joe
JLM Audio
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
A happy customer about 3 years later. After reading my responses from building this a few years ago, I realized that I never properly thanked Joe for walking me through the mess I got myself into. Moral of the story - read the instructions and look at the pictures twice before mounting anything. I think the saga is around pg. 10-13 if you're interested.
I ended up building an 11 space rack, right now only 2 units using the +/-16v rails.
We ran into an issue mounting the 6A bridge and I had to use a 4A instead. My rough math:
Normal Powerstation: 1A shared
4A Bridge (somewhere between 1A and 3A?)
6A Bridge: 3A shared
If 500 series units are 130-140mA each (if following spec), that makes for 1.3 - 1.4A on a fully loaded 10 space rack.
I guess a simpler way to phrase the question would be - what is the maximum current draw when using a 4A Bridge?
Thanks Joe, I'm glad to see this forum STILL providing such a resource for audio enthusiasts across the globe. To the readers on the fence - if you're hesitant about getting your hands dirty, rest assured that this is a vibrant community of folks who were at some point just like yourself. Not only will you learn something and feel good about it after - you're helping support others alongside and behind you.
I ended up building an 11 space rack, right now only 2 units using the +/-16v rails.
We ran into an issue mounting the 6A bridge and I had to use a 4A instead. My rough math:
Normal Powerstation: 1A shared
4A Bridge (somewhere between 1A and 3A?)
6A Bridge: 3A shared
If 500 series units are 130-140mA each (if following spec), that makes for 1.3 - 1.4A on a fully loaded 10 space rack.
I guess a simpler way to phrase the question would be - what is the maximum current draw when using a 4A Bridge?
Thanks Joe, I'm glad to see this forum STILL providing such a resource for audio enthusiasts across the globe. To the readers on the fence - if you're hesitant about getting your hands dirty, rest assured that this is a vibrant community of folks who were at some point just like yourself. Not only will you learn something and feel good about it after - you're helping support others alongside and behind you.
Re: AC/DC & POWERSTATION KIT BUILD THREAD
Yes, it was a type I meant Diodes.Joe Malone wrote:I don't know what extra resistors you mean or do you mean diodes? 1N4007 are 1Amp diodes which is perfect for 99% of the power supply uses. They are needed on the PCB for other protection diodes roles so make perfect sense to use them for everything so there is less parts confusion when building the kit. Remember to get to 1.5A per rail you will need very good large heatsinking of the regulators.Also, I needed 1,5 amps so I soldered the 4 extra diodes under the pcb, why are these extra resistors needed?
LM317 and LM337 can both supply 1,5amps, so wheres the limitation of 1 Amp? is at the 1N4007 diodes themselves?
if thats the situation why did you choose to design this PSU with the 1N4007 diodes instead of using an 1,5amp rated Bridge Rectifier?
What I meant to ask is if the Regulators are able to provide 1.5amps (if properlly heatsinked) then the 1Amp limitation is from the 1N4007 bridge rectifier diodes themselves, is that correct?
So the 4 extra 1N4007 Diodes are needed in order to solve the limitation of the BR 1N4007 diodes already used?
If I use 4 diferent diodes for the Bridge Rectifier that were rated higher than 1.5 amps instead of the 1N4007 could I skip the 4 extra diodes under the board?
thank you so much
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Yes to all the above questionswhoops wrote:Yes, it was a type I meant Diodes.Joe Malone wrote:I don't know what extra resistors you mean or do you mean diodes? 1N4007 are 1Amp diodes which is perfect for 99% of the power supply uses. They are needed on the PCB for other protection diodes roles so make perfect sense to use them for everything so there is less parts confusion when building the kit. Remember to get to 1.5A per rail you will need very good large heatsinking of the regulators.Also, I needed 1,5 amps so I soldered the 4 extra diodes under the pcb, why are these extra resistors needed?
LM317 and LM337 can both supply 1,5amps, so wheres the limitation of 1 Amp? is at the 1N4007 diodes themselves?
if thats the situation why did you choose to design this PSU with the 1N4007 diodes instead of using an 1,5amp rated Bridge Rectifier?
What I meant to ask is if the Regulators are able to provide 1.5amps (if properlly heatsinked) then the 1Amp limitation is from the 1N4007 bridge rectifier diodes themselves, is that correct?
So the 4 extra 1N4007 Diodes are needed in order to solve the limitation of the BR 1N4007 diodes already used?
If I use 4 diferent diodes for the Bridge Rectifier that were rated higher than 1.5 amps instead of the 1N4007 could I skip the 4 extra diodes under the board?
thank you so much
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Thank you so much Joe
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
agentile1990 wrote:A happy customer about 3 years later. After reading my responses from building this a few years ago, I realized that I never properly thanked Joe for walking me through the mess I got myself into. Moral of the story - read the instructions and look at the pictures twice before mounting anything. I think the saga is around pg. 10-13 if you're interested.
I ended up building an 11 space rack, right now only 2 units using the +/-16v rails.
We ran into an issue mounting the 6A bridge and I had to use a 4A instead. My rough math:
Normal Powerstation: 1A shared
4A Bridge (somewhere between 1A and 3A?)
6A Bridge: 3A shared
If 500 series units are 130-140mA each (if following spec), that makes for 1.3 - 1.4A on a fully loaded 10 space rack.
I guess a simpler way to phrase the question would be - what is the maximum current draw when using a 4A Bridge?
Thanks Joe, I'm glad to see this forum STILL providing such a resource for audio enthusiasts across the globe. To the readers on the fence - if you're hesitant about getting your hands dirty, rest assured that this is a vibrant community of folks who were at some point just like yourself. Not only will you learn something and feel good about it after - you're helping support others alongside and behind you.
When using a 4A Bridge max current for total positive rails is 4A and same for negative rails. So 4A is fine to get maximum out of the power supply since each regulator max is 1.5A.
Joe
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Once again - Joe to the rescue.Joe Malone wrote: each regulator max is 1.5A.
So essentially what you're saying here is that with the 4A or 6A Bridge, the limiting factor becomes the current capacity of the regulators?
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Yes correctagentile1990 wrote:Once again - Joe to the rescue.Joe Malone wrote: each regulator max is 1.5A.
So essentially what you're saying here is that with the 4A or 6A Bridge, the limiting factor becomes the current capacity of the regulators?
Joe
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Re: AC/DC & POWERSTATION KIT BUILD THREAD
Hello everyone,
I've finished my AC/DC psu kit and I'm reading correct voltage on each rail (burnt it in for about 45 mins, measuring each rail). I then went to check continuity between the voltage regs and the psu chassis and noticed a short between the lM337 and the chassis...according to the information on the build, I shouldn't read continuity between any of the regs?
This is the second time I've powered up the psu, the first time, the 1W resistor burnt up, which was then replaced, and was never an issue after that.
Is this detrimental to the psu? Or can it operate normally like this? Like I mentioned before, the rails measured perfect, so I'm unclear as to how I should proceed. Any help would be greatly appreciated.
Thanks!
I've finished my AC/DC psu kit and I'm reading correct voltage on each rail (burnt it in for about 45 mins, measuring each rail). I then went to check continuity between the voltage regs and the psu chassis and noticed a short between the lM337 and the chassis...according to the information on the build, I shouldn't read continuity between any of the regs?
This is the second time I've powered up the psu, the first time, the 1W resistor burnt up, which was then replaced, and was never an issue after that.
Is this detrimental to the psu? Or can it operate normally like this? Like I mentioned before, the rails measured perfect, so I'm unclear as to how I should proceed. Any help would be greatly appreciated.
Thanks!