I am fairly new to this.
Can anyone help me setup a switch mode power supply to test my pcb with. I have everything populated but when I go to hook it up...the way i think is correct i can't seem to get -24 volts? I seem to get +24 fine.
Where do i connect the ground wires on the pcb directly to psu? pcb ground to chassis.
any help is appreciated
Can anyone help me setup a switch mode power supply to test my pcb with. I have everything populated but when I go to hook it up...the way i think is correct i can't seem to get -24 volts? I seem to get +24 fine.
Where do i connect the ground wires on the pcb directly to psu? pcb ground to chassis.
any help is appreciated
Mr. Bulls Hit,
Is it a single SMPS? I doubt you can make a bipolar supply with it.
Also, it would be of great help to know what you are building... 🙂 🙂 🙂
Is it a single SMPS? I doubt you can make a bipolar supply with it.
Also, it would be of great help to know what you are building... 🙂 🙂 🙂
pics , pretty please
presuming that your switching PSU is +24Vdc , you'll need two of them for bipolar supply
in stacked arrangement
but , clarify , so we can help
presuming that your switching PSU is +24Vdc , you'll need two of them for bipolar supply
in stacked arrangement
but , clarify , so we can help
Greetings.
I will try to attach photos... see attached
power supply is UAW250S:
http://www.cosel.co.jp/en/products/pdf/SFE_UAW.pdf
It is aleph J pcb I want to start up
I will try to attach photos... see attached
power supply is UAW250S:
http://www.cosel.co.jp/en/products/pdf/SFE_UAW.pdf
It is aleph J pcb I want to start up
Attachments
It's only a single 24V supply so you would need two of them to provide + and - supplies.
I note you already have two of them, I presume you have one for each amp.
I have to assume that the outputs are electrically isolated from each other.
Try connecting V+ of one to V- of the other and use this common connection for 0V. Then use the unused V- and V+ as your -24V and +24V supplies.
I note you already have two of them, I presume you have one for each amp.
I have to assume that the outputs are electrically isolated from each other.
Try connecting V+ of one to V- of the other and use this common connection for 0V. Then use the unused V- and V+ as your -24V and +24V supplies.
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you need to stack two of them to have bipolar PSU
+V of first is +24v
-V of second is -24V
connect bridge between -V of first and +V of second , and that's system audio GND
+V of first is +24v
-V of second is -24V
connect bridge between -V of first and +V of second , and that's system audio GND
Thanks for everyones replies.
I will look for a single dual power supply.. I have two of these 1u power supply but i do not want to use two because it will be too big for my chassis unless i mount into seperate chassis like in the photo it now looks big and ugly LoL
Again thanks I will try Kate and Dad's suggestion first. 😛
I will look for a single dual power supply.. I have two of these 1u power supply but i do not want to use two because it will be too big for my chassis unless i mount into seperate chassis like in the photo it now looks big and ugly LoL
Again thanks I will try Kate and Dad's suggestion first. 😛
According to the datasheet these SMPS's are single output.
Your last picture shows FG (frame ground) connected aswell as + and -.
To hook up the right way is to connect the + from one PS unit to the - of the other. This connection will be GND for the amplifier! Then take + from one and - from the other unit (those that were NOT used to connect GND).
Pls check the SMPS frame if it is connected to the -. If this is not the case then proceed. The FG terminals connect to earth.
If the case is connected to - then one PS must be mounted insulated.
Your last picture shows FG (frame ground) connected aswell as + and -.
To hook up the right way is to connect the + from one PS unit to the - of the other. This connection will be GND for the amplifier! Then take + from one and - from the other unit (those that were NOT used to connect GND).
Pls check the SMPS frame if it is connected to the -. If this is not the case then proceed. The FG terminals connect to earth.
If the case is connected to - then one PS must be mounted insulated.
I also have another question as for RCA input... do I bridge -In to ground?
Thanks again guys not too much BS around here today 😉
Thanks again guys not too much BS around here today 😉
The nature of these beasts is that normally the -ve will be connected to the chassis - not always but its common.
Just measure between V+ and chassis and V- and chassis with a DMM.
If they are open circuit you are laughing. If not then you will have to insulate one PSU from the chassis. Not a problem just use insulating standoffs and nylon bolts.
The PSU that you use for the +24V can be mounted normally, it is the PSU that you want use for the -24V that must be isolated from Chassis GND as you will be connecting its +V to the Chassis and using its -V as -24V.
Just measure between V+ and chassis and V- and chassis with a DMM.
If they are open circuit you are laughing. If not then you will have to insulate one PSU from the chassis. Not a problem just use insulating standoffs and nylon bolts.
The PSU that you use for the +24V can be mounted normally, it is the PSU that you want use for the -24V that must be isolated from Chassis GND as you will be connecting its +V to the Chassis and using its -V as -24V.
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I'll post a small video of it (NP aleph J) running on youtube then thread can be closed/moved?
Now I get -24v and +24 to the pcb but no sound.. gah... i wonder how i bridge the input of rca?
well - everything
search for Algar_emi's Aleph30.pdf on forum
even if plain Aleph , you'll find detailed info what's each part doing
or post Papa's A J sch here , with your voltages shown , for all important positions
search for Algar_emi's Aleph30.pdf on forum
even if plain Aleph , you'll find detailed info what's each part doing
or post Papa's A J sch here , with your voltages shown , for all important positions
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