hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.
I need 5V for the TTL and -15/15 for the Audio end.
actually i need linear for the audio rails (centre tapped) so i have
decided to for a SMPS for the TTL 5V and a separate Linear for the audio.
I now need to build an enclosure and have a double pole switch firing both
up at the same time. Is anyone familiar with this ?
Purchased the 5v with a whopping 200w, as the ATX only has 100w
Linear Supply on the wayOn Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
Might not be the voltage/ampage you want, but you can use this as a guide.
It shows the requirements for the +/- supply, regulation and output.On Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
Further to this, getting regulators rated to that high load will proabbly
be difficult, you could use a technique such
as http://www.zen22142.zen.co.uk/Circuits/Power/boosti.htm
Please note: I am not as experienced as alot of the guys on here, take
their advice over mine if they contradictOn Thursday, 21 May 2015 10:04:50 UTC+1, Nathan Hickling wrote:
Might not be the voltage/ampage you want, but you can use this as a guide.
It shows the requirements for the +/- supply, regulation and output.On Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
Hmm its been a while since I designed a power supply… but I managed to
come across an old site I got a load of useful info from:
http://www.markhennessy.co.uk/articles/power_supplies.htm
Have a look at the rest of his site for power supplies he built for various
parts of his systems. Something else to do might be to head to a library
and see if there is any power supply design books in there.
Also have a chat with Alex, he may have some recommended reading, or
atleast know of somewhere to start looking for high-power linear power
supplies.
One final thing: Invest in some insulated screwdrivers - they’ve saved me
from shooting myself across the room a lot when messing with mains!On 21 May 2015 at 10:09, Nathan Hickling unfoundbug@gmail.com wrote:
Further to this, getting regulators rated to that high load will proabbly
be difficult, you could use a technique such as
http://www.zen22142.zen.co.uk/Circuits/Power/boosti.htmPlease note: I am not as experienced as alot of the guys on here, take
their advice over mine if they contradictOn Thursday, 21 May 2015 10:04:50 UTC+1, Nathan Hickling wrote:
Might not be the voltage/ampage you want, but you can use this as a
guide. It shows the requirements for the +/- supply, regulation and output.On Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
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Sorry I appear to have missed this one!
It sounds like you are building a power supply for a large audio amplifier
or PA system. I would not under any circumstances use a switch mode power
supply in an audio application. The switching noise introduced from the
switching power supply ruins the purity of the audio unless the amplifier
is a class D in which case it doesn’t matter.
To achieve what you require I would be looking at designing a linear power
supply using a toroidal centre tapped transformer which has the power
rating you need.
Questions:
What is the maximum power required for each rail? How many watts RMS is
the audio amplifier and I can work back…
What is the TTL 5V for and what is the topology of the audio amplifier?
From that what is needed is the following:
- 230 Vac mains filter - fused with surge protection
- 30VA toroidal mains transformer with thermal protection
- Mains rated 5A bridge rectifier and heatsink
- Large Electrolytic smoothing capacitors rated for +/- 50 Vdc operation
(4700 uF) or more - Linear voltage regulators 7815 and 7915 will be ok with heatsinks and
then configure for high current mode with pass transistors - 7805 linear voltage regulator and capacitors for 5 Vdc TTL stage.
- Power on indication etc.
- Enclosure and power on indicator and connectors etc.
I made a guess at the power rating for the transformer but it will be
expensive as it contains a lot of copper. Once the power requirements are
known I can be more specific.
I can help design all of this and go over the theory if you like. It is a
good learning project but as there is mains voltage involved it can be
dangerous which is why Tom mentioned insulating screw drivers.
Regards
AlexOn 21 May 2015 at 14:43, Tom Bloor tom.bloor@gmail.com wrote:
Hmm its been a while since I designed a power supply… but I managed to
come across an old site I got a load of useful info from:http://www.markhennessy.co.uk/articles/power_supplies.htm
Have a look at the rest of his site for power supplies he built for
various parts of his systems. Something else to do might be to head to a
library and see if there is any power supply design books in there.Also have a chat with Alex, he may have some recommended reading, or
atleast know of somewhere to start looking for high-power linear power
supplies.One final thing: Invest in some insulated screwdrivers - they’ve saved me
from shooting myself across the room a lot when messing with mains!On 21 May 2015 at 10:09, Nathan Hickling unfoundbug@gmail.com wrote:
Further to this, getting regulators rated to that high load will proabbly
be difficult, you could use a technique such as
http://www.zen22142.zen.co.uk/Circuits/Power/boosti.htmPlease note: I am not as experienced as alot of the guys on here, take
their advice over mine if they contradictOn Thursday, 21 May 2015 10:04:50 UTC+1, Nathan Hickling wrote:
Might not be the voltage/ampage you want, but you can use this as a
guide. It shows the requirements for the +/- supply, regulation and output.On Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
–
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hi,
sorry i started on one track and moved to another.
The power supply is for a Kurzweil K250.
I have sourced a 200w 5v 3A meanwell, SMPS supply for £25 . This will be
for the TTL, there is a lot of TTL.
I need purchase a 150-200w Lambda 15/-15v linear supply for the Audio .
The lambda has large smoothing sprague caps and it was in the original
design too.
I need an enclosure a DPST to turn both on at the same time but i could do
help with this aspect. Finally, will need 28awg in some sort of cable
leading into the K250. The k250 sport an odd looking 12pin power connector
which i need to replace with something that can take by 5v, 15/-15 and
returns. The remainder of the pins were for two footpedals and a pulse
from a Power failure circuit, which i hope to live without.
The original supply, from the service manual, and from what i can piece
together was 330w made up of the Lambda for the audio and a Boschert
(computer audio parts) for the 5v. Whilst SPMS supplies have improved i
believe Linear supplies with this level of wattage are not freely available.
Best
RajOn Thursday, 21 May 2015 15:49:52 UTC+1, Alexander Lang wrote:
Sorry I appear to have missed this one!
It sounds like you are building a power supply for a large audio amplifier
or PA system. I would not under any circumstances use a switch mode power
supply in an audio application. The switching noise introduced from the
switching power supply ruins the purity of the audio unless the amplifier
is a class D in which case it doesn’t matter.To achieve what you require I would be looking at designing a linear power
supply using a toroidal centre tapped transformer which has the power
rating you need.Questions:
What is the maximum power required for each rail? How many watts RMS is
the audio amplifier and I can work back…
What is the TTL 5V for and what is the topology of the audio amplifier?From that what is needed is the following:
- 230 Vac mains filter - fused with surge protection
- 30VA toroidal mains transformer with thermal protection
- Mains rated 5A bridge rectifier and heatsink
- Large Electrolytic smoothing capacitors rated for +/- 50 Vdc operation
(4700 uF) or more- Linear voltage regulators 7815 and 7915 will be ok with heatsinks and
then configure for high current mode with pass transistors- 7805 linear voltage regulator and capacitors for 5 Vdc TTL stage.
- Power on indication etc.
- Enclosure and power on indicator and connectors etc.
I made a guess at the power rating for the transformer but it will be
expensive as it contains a lot of copper. Once the power requirements are
known I can be more specific.I can help design all of this and go over the theory if you like. It is a
good learning project but as there is mains voltage involved it can be
dangerous which is why Tom mentioned insulating screw drivers.Regards
Alex
On 21 May 2015 at 14:43, Tom Bloor <tom....@gmail.com <javascript:>> wrote:
Hmm its been a while since I designed a power supply… but I managed to
come across an old site I got a load of useful info from:http://www.markhennessy.co.uk/articles/power_supplies.htm
Have a look at the rest of his site for power supplies he built for
various parts of his systems. Something else to do might be to head to a
library and see if there is any power supply design books in there.Also have a chat with Alex, he may have some recommended reading, or
atleast know of somewhere to start looking for high-power linear power
supplies.One final thing: Invest in some insulated screwdrivers - they’ve saved me
from shooting myself across the room a lot when messing with mains!On 21 May 2015 at 10:09, Nathan Hickling <unfou...@gmail.com <javascript:>> wrote:
Further to this, getting regulators rated to that high load will
proabbly be difficult, you could use a technique such as
http://www.zen22142.zen.co.uk/Circuits/Power/boosti.htmPlease note: I am not as experienced as alot of the guys on here, take
their advice over mine if they contradictOn Thursday, 21 May 2015 10:04:50 UTC+1, Nathan Hickling wrote:
Might not be the voltage/ampage you want, but you can use this as a
guide. It shows the requirements for the +/- supply, regulation and output.On Wednesday, 20 May 2015 16:04:39 UTC+1, Raj Patel wrote:
hi,
does anyone know about building power supplies? i need a stablished DC
supply. I have thought about modifying a PC ATX supply but they are under
powered in the -12v.I need 5V for the TTL and -15/15 for the Audio end.
–
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Raj,
In order to help you I need photos of the connector. From that I can work
out if there is a connector available or if we need to be more inventive.
What do you mean by Lambda power supply. From what you have written this
is a bipolar output high current DC supply with extra filtering on the
input and output to prevent noise being coupled to the audio circuit.
If you mean Lambda - the power supply company then yes they probably will
supply what you require but are very expensive (and excellent). I have
been to their offices in Devon. They are were very competent design
engineers…They mostly make switch-mode power supplies however not Linear
types etc.
A linear power supply of that wattage will be a rare beast indeed…
I suggest looking on ebay for a suitable linear PSU of that wattage but you
won’t find much. To get the specification you need you are going to have
to make it. It isn’t too hard and the design steps I mentioned in my
previous email are where to start…
Cheers
AlexOn 24 May 2015 21:38, “Harvinder Atwal” harvinder@harvinderatwal.com wrote:
Alex.
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Raj,
I did find these guys selling most of what I discussed for making a high
current linear supply. You will need to add the high current regulation
yourself however but I can help you with that…
http://www.zappautomation.co.uk/ps408-12-linear-power-supply-7.html
gclid=CjwKEAjws5CrBRD8ze702_2dyjYSJAAAJK9ysdeGfMKMorPeFN_zjlujirxkkyDK2YGevHozUlXNeRoCuVrw_wcB
You also mentioned a DPST - double pole single throw switch to make both
power supplies come on simultaneously. Not sure why this is an issue for
you but I can provide a diagram and advice. Did you want to switch the
mains or the DC side. Switching the mains is probably easier as then all
you need is a mains rated switch and to connect it up…If you want to
switch the DC then it’s still possible although with the power in your
circuit you will need a high current switch…which is the same as the
mains rated one so I don’t see the benefit (just my ten pence)…
With a mains rated DPST
Live - to switch - Live out - chocolate box terminal connections - Live to
5V PSU and live to +/-15V PSU
Neutral to switch Neutral out - chocolate box terminal connections -
Neutral to 5V PSU and Neutral to +/-15V PSU
Earth to Star earth point of metal enclosure (If metal)
It might help if you could draw a diagram of the system and some photos to
explain your requirements.
Cheers
AlexOn 26 May 2015 at 11:35, Alexander Lang alexanderlang1980@gmail.com wrote:
Raj,
In order to help you I need photos of the connector. From that I can work
out if there is a connector available or if we need to be more inventive.What do you mean by Lambda power supply. From what you have written this
is a bipolar output high current DC supply with extra filtering on the
input and output to prevent noise being coupled to the audio circuit.If you mean Lambda - the power supply company then yes they probably will
supply what you require but are very expensive (and excellent). I have
been to their offices in Devon. They are were very competent design
engineers…They mostly make switch-mode power supplies however not Linear
types etc.A linear power supply of that wattage will be a rare beast indeed…
I suggest looking on ebay for a suitable linear PSU of that wattage but
you won’t find much. To get the specification you need you are going to
have to make it. It isn’t too hard and the design steps I mentioned in my
previous email are where to start…Cheers
Alex
On 24 May 2015 21:38, “Harvinder Atwal” harvinder@harvinderatwal.com wrote:Alex.
–
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Hello Alex,
Thanks for your help and assistance.
I think i’d rather go for the original Lambda as i have sourced one at lower cost than the linear supply you have linked to.
I suppose now i need suggestions for a suitable enclosures, to house both PSUs, and i’m leaning to ABS so as to keep the weight down.
Separately, there is the ‘weird’ connector, 12 pins, which i think i need to remove and replace.
I cannot find details of this this connector in the service manual or parts list. I suspect it could be bespoke. I have tried to attach a photo , of the connector and hopefully this will show> On 26 May 2015, at 12:45, Alexander Lang alexanderlang1980@gmail.com wrote:
Raj,
I did find these guys selling most of what I discussed for making a high current linear supply. You will need to add the high current regulation yourself however but I can help you with that…
http://www.zappautomation.co.uk/ps408-12-linear-power-supply-7.html http://www.zappautomation.co.uk/ps408-12-linear-power-supply-7.html gclid=CjwKEAjws5CrBRD8ze702_2dyjYSJAAAJK9ysdeGfMKMorPeFN_zjlujirxkkyDK2YGevHozUlXNeRoCuVrw_wcB
You also mentioned a DPST - double pole single throw switch to make both power supplies come on simultaneously. Not sure why this is an issue for you but I can provide a diagram and advice. Did you want to switch the mains or the DC side. Switching the mains is probably easier as then all you need is a mains rated switch and to connect it up…If you want to switch the DC then it’s still possible although with the power in your circuit you will need a high current switch…which is the same as the mains rated one so I don’t see the benefit (just my ten pence)…
With a mains rated DPST
Live - to switch - Live out - chocolate box terminal connections - Live to 5V PSU and live to +/-15V PSU
Neutral to switch Neutral out - chocolate box terminal connections - Neutral to 5V PSU and Neutral to +/-15V PSU
Earth to Star earth point of metal enclosure (If metal)
It might help if you could draw a diagram of the system and some photos to explain your requirements.
Cheers
Alex
On 26 May 2015 at 11:35, Alexander Lang <alexanderlang1980@gmail.com mailto:alexanderlang1980@gmail.com> wrote:
Raj,In order to help you I need photos of the connector. From that I can work out if there is a connector available or if we need to be more inventive.
What do you mean by Lambda power supply. From what you have written this is a bipolar output high current DC supply with extra filtering on the input and output to prevent noise being coupled to the audio circuit.
If you mean Lambda - the power supply company then yes they probably will supply what you require but are very expensive (and excellent). I have been to their offices in Devon. They are were very competent design engineers…They mostly make switch-mode power supplies however not Linear types etc.
A linear power supply of that wattage will be a rare beast indeed…
I suggest looking on ebay for a suitable linear PSU of that wattage but you won’t find much. To get the specification you need you are going to have to make it. It isn’t too hard and the design steps I mentioned in my previous email are where to start…
Cheers
Alex
On 24 May 2015 21:38, “Harvinder Atwal” <harvinder@harvinderatwal.com mailto:harvinder@harvinderatwal.com> wrote:
Alex.–
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Ok that connector was one that NASA used to use and TE/AMP have helped me
locate the mate. This was a £15k machine back in 85-90 it even has faraday
cages over audio parts, ridiculously over engineered and op amps, dacs, per
voice so no aliasing just some broadband fuzz from 12bit quantiization and
companding algorithm that is pleasing.
I have also rigged up an ATX power supply, for the TTL, which whilst not
safe has allowed me to see if it works, photo below. Audio power is off
a TDK Lambda Linear from the states £20 but weights a ton.
I now need to decide whether to cup up the PCB remote panel and put it in a
19" chassis or keep it as it is. The Analog, board, Channel Board pcbs are
all on trays and could easily be housed in a chassis. I could just mount
the PCBs in the chassis and with the panel run two long 34pin cables to the
chassis and it could really be a remote. Anyone done anything like this?
https://lh3.googleusercontent.com/-k7ZdGDuMO8M/VX7Fh0DOJmI/AAAAAAAABaI/j1vKAzji1IE/s1600/IMG_1853.jpgOn Tuesday, 26 May 2015 12:59:03 UTC+1, Raj Patel wrote:
Hello Alex,
Thanks for your help and assistance.I think i’d rather go for the original Lambda as i have sourced one at
lower cost than the linear supply you have linked to.I suppose now i need suggestions for a suitable enclosures, to house both
PSUs, and i’m leaning to ABS so as to keep the weight down.Separately, there is the ‘weird’ connector, 12 pins, which i think i need
to remove and replace.I cannot find details of this this connector in the service manual or
parts list. I suspect it could be bespoke. I have tried to attach a
photo , of the connector and hopefully this will showOn 26 May 2015, at 12:45, Alexander Lang al@gmail.com wrote:
Raj,
I did find these guys selling most of what I discussed for making a high
current linear supply. You will need to add the high current regulation
yourself however but I can help you with that…http://www.zappautomation.co.uk/ps408-12-linear-power-supply-7.html
gclid=CjwKEAjws5CrBRD8ze702_2dyjYSJAAAJK9ysdeGfMKMorPeFN_zjlujirxkkyDK2YGevHozUlXNeRoCuVrw_wcBYou also mentioned a DPST - double pole single throw switch to make both
power supplies come on simultaneously. Not sure why this is an issue for
you but I can provide a diagram and advice. Did you want to switch the
mains or the DC side. Switching the mains is probably easier as then all
you need is a mains rated switch and to connect it up…If you want to
switch the DC then it’s still possible although with the power in your
circuit you will need a high current switch…which is the same as the
mains rated one so I don’t see the benefit (just my ten pence)…With a mains rated DPST
Live - to switch - Live out - chocolate box terminal connections - Live to
5V PSU and live to +/-15V PSUNeutral to switch Neutral out - chocolate box terminal connections -
Neutral to 5V PSU and Neutral to +/-15V PSUEarth to Star earth point of metal enclosure (If metal)
It might help if you could draw a diagram of the system and some photos to
explain your requirements.Cheers
Alex
On 26 May 2015 at 11:35, Alexander Lang alexanderlang1980@gmail.com wrote:
Raj,
In order to help you I need photos of the connector. From that I can
work out if there is a connector available or if we need to be more
inventive.What do you mean by Lambda power supply. From what you have written this
is a bipolar output high current DC supply with extra filtering on the
input and output to prevent noise being coupled to the audio circuit.If you mean Lambda - the power supply company then yes they probably will
supply what you require but are very expensive (and excellent). I have
been to their offices in Devon. They are were very competent design
engineers…They mostly make switch-mode power supplies however not Linear
types etc.A linear power supply of that wattage will be a rare beast indeed…
I suggest looking on ebay for a suitable linear PSU of that wattage but
you won’t find much. To get the specification you need you are going to
have to make it. It isn’t too hard and the design steps I mentioned in my
previous email are where to start…Cheers
Alex
On 24 May 2015 21:38, “Harvinder Atwal” harvinder@harvinderatwal.com wrote:Alex.
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I never have…looks impressive. I’m not surprised about the Linear PSU.
It was always going to be huge to achieve the power required.
AlexOn 15 June 2015 at 13:33, Raj Patel rajahpatel@googlemail.com wrote:
Ok that connector was one that NASA used to use and TE/AMP have helped me
locate the mate. This was a £15k machine back in 85-90 it even has faraday
cages over audio parts, ridiculously over engineered and op amps, dacs, per
voice so no aliasing just some broadband fuzz from 12bit quantiization and
companding algorithm that is pleasing.I have also rigged up an ATX power supply, for the TTL, which whilst not
safe has allowed me to see if it works, photo below. Audio power is off
a TDK Lambda Linear from the states £20 but weights a ton.I now need to decide whether to cup up the PCB remote panel and put it in
a 19" chassis or keep it as it is. The Analog, board, Channel Board pcbs
are all on trays and could easily be housed in a chassis. I could just
mount the PCBs in the chassis and with the panel run two long 34pin cables
to the chassis and it could really be a remote. Anyone done anything like
this?On Tuesday, 26 May 2015 12:59:03 UTC+1, Raj Patel wrote:
Hello Alex,
Thanks for your help and assistance.I think i’d rather go for the original Lambda as i have sourced one at
lower cost than the linear supply you have linked to.I suppose now i need suggestions for a suitable enclosures, to house both
PSUs, and i’m leaning to ABS so as to keep the weight down.Separately, there is the ‘weird’ connector, 12 pins, which i think i need
to remove and replace.I cannot find details of this this connector in the service manual or
parts list. I suspect it could be bespoke. I have tried to attach a
photo , of the connector and hopefully this will showOn 26 May 2015, at 12:45, Alexander Lang al@gmail.com wrote:
Raj,
I did find these guys selling most of what I discussed for making a high
current linear supply. You will need to add the high current regulation
yourself however but I can help you with that…http://www.zappautomation.co.uk/ps408-12-linear-power-supply-7.html
gclid=CjwKEAjws5CrBRD8ze702_2dyjYSJAAAJK9ysdeGfMKMorPeFN_zjlujirxkkyDK2YGevHozUlXNeRoCuVrw_wcBYou also mentioned a DPST - double pole single throw switch to make both
power supplies come on simultaneously. Not sure why this is an issue for
you but I can provide a diagram and advice. Did you want to switch the
mains or the DC side. Switching the mains is probably easier as then all
you need is a mains rated switch and to connect it up…If you want to
switch the DC then it’s still possible although with the power in your
circuit you will need a high current switch…which is the same as the
mains rated one so I don’t see the benefit (just my ten pence)…With a mains rated DPST
Live - to switch - Live out - chocolate box terminal connections - Live
to 5V PSU and live to +/-15V PSUNeutral to switch Neutral out - chocolate box terminal connections -
Neutral to 5V PSU and Neutral to +/-15V PSUEarth to Star earth point of metal enclosure (If metal)
It might help if you could draw a diagram of the system and some photos
to explain your requirements.Cheers
Alex
On 26 May 2015 at 11:35, Alexander Lang alexanderlang1980@gmail.com wrote:
Raj,
In order to help you I need photos of the connector. From that I can
work out if there is a connector available or if we need to be more
inventive.What do you mean by Lambda power supply. From what you have written
this is a bipolar output high current DC supply with extra filtering on the
input and output to prevent noise being coupled to the audio circuit.If you mean Lambda - the power supply company then yes they probably
will supply what you require but are very expensive (and excellent). I
have been to their offices in Devon. They are were very competent design
engineers…They mostly make switch-mode power supplies however not Linear
types etc.A linear power supply of that wattage will be a rare beast indeed…
I suggest looking on ebay for a suitable linear PSU of that wattage but
you won’t find much. To get the specification you need you are going to
have to make it. It isn’t too hard and the design steps I mentioned in my
previous email are where to start…Cheers
Alex
On 24 May 2015 21:38, “Harvinder Atwal” harvinder@harvinderatwal.com wrote:Alex.
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