Power Supply for 2 ACA in one Chassis

[Bergenton]

I have 2 ACAs in their own chassis from the kit. I want to consolidate them into one chassis, which will most likely be the Dissipante 2U. My last issue is the power supply.

Instead of having 2 power inputs on the backplate, what is the best way for each ACA to have their own 24v power supply? Would I use the Universal Power Supply in the DIY store; and how would I go about adapting it to my situation?

Thanks!

 

[planet10]

Is the case alrge enuff to park the supplies inside the chassis?

dave

 

[Bergenton]

If not, I have zero issue with getting a larger case!

 

[Ben Mah]

You can use one diyAudio PS Board for two independent V+ power supplies to power two ACAs.

As for power transfer you can possibly use five pin XLRs and five wire 18 ga. cord. Female chassis socket on the PS chassis and male chassis socket on the amplifier chassis. Two wires for each power supply and one wire for safety ground.

Here is the PS Board for two independent supplies. The rectifiers are your choice. You can use board mounted rectifiers or chassis mounted bridges.

PS. I assumed a separate chassis for the power supply. If everything is in one chassis, ignore my comments about XLRs and power cord.

I assume that if you are using two independent power supply boards, you are using two power transformers, and a fuse should be provided for each transformer.

 

[Bergenton]

Is it possible to use one power supply for both ACAs by using larger capacitors? I am quite new to power supplies and transformers; could you mark up the schematic of the universal power supply board? I don't really understand the annotated picture you linked.

Thanks for your patience! I'm still learning 🙂

 

[Ben Mah]

Yes, you can use one power supply to power both ACAs. I just remembered that many transformers, including Antek transformers that are readily available and used my many diyAudio members, have two secondary windings so you need only one transformer and one PS Board to build two independent power supplies. So also no need for two fuses.

The diyAudio PS Board as configured is for a V+ power supply and V- power supply that is required by many First Watt amplifiers. However the ACA only needs a V+ power supply. So the right side of the board, which is usually the V- power supply, can be reconfigured to also be a V+ supply. To accomplish that, the polarity of the input DC wires and capacitors are reversed. The red markings on the right side of the board show that.

So one power transformer with two secondary windings and one completed PS board will give you two independent V+ power supplies - one for each ACA.

 

[TonyTecson]

have done that.....4 x 48vdc smps board to two boards bridged ACA..

 

[Bergenton]

Yes, you can use one power supply to power both ACAs. I just remembered that many transformers, including Antek transformers that are readily available and used my many diyAudio members, have two secondary windings so you need only one transformer and one PS Board to build two independent power supplies. So also no need for two fuses.

The diyAudio PS Board as configured is for a V+ power supply and V- power supply that is required by many First Watt amplifiers. However the ACA only needs a V+ power supply. So the right side of the board, which is usually the V- power supply, can be reconfigured to also be a V+ supply. To accomplish that, the polarity of the input DC wires and capacitors are reversed. The red markings on the right side of the board show that.

So one power transformer with two secondary windings and one completed PS board will give you two independent V+ power supplies - one for each ACA.

Thank you so much for this! I'm gonna do some research. I will probably have some follow up questions/clarifications tomorrow! 🙂