Electronics > Beginners
2 power supplies for a amp
vol.2:
Hello,
I am looking for a power supply solution to an audio amplifier board which requires +/-24VDC. Most symmetrical power supplies seem to be very expensive, but I thought maybe I can buy two of these cheaper ones?
https://www.digikey.com/products/en?keywords=lrs-100-24
One interesting note about this amp: although it is a single output amp, it seems to have four output terminals. They are two for ground and the other two are labelled +24V and -24V. I looked at the data sheet, and they are definitely single output, so I wonder also why they have this option.
Thanks,
Zero999:
That power supply will probably do the job, but you forgot to post the data sheet for the amplifier, so we don't know how much current it requires.
Another option is to use two 24V supplies in series and take the 0V from when they join. Connecting a couple of diodes in parallel with each of them is a good idea to prevent either supply from seeing to higher negative voltage, if it current limits or shuts down. The diodes should be rated to a bit more current, than the power supply's rating.
Having more than one 0V connection is pretty common.
soldar:
It is a single output PSU and you would need two.
vol.2:
--- Quote from: Zero999 on September 25, 2019, 04:49:38 pm ---That power supply will probably do the job, but you forgot to post the data sheet for the amplifier, so we don't know how much current it requires.
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--- End quote ---
Thanks for your reply. :)
I am sorry I forgot the amplifier! This is what I see, there is a circuit schematic in the pictures. https://www.ebay.com/itm/20W-HIFI-Mono-Channel-LM1875T-Stereo-Audio-Amplifier-Board-Module-DIY-Kits/182588636277?hash=item2a83217c75:g:6OYAAOSw42JZJAU4
I plan to use 2 of these together and use some decent heat sinks. So I can use two of the 24VDC meanwell and wire two of these up?
Thanks,
mariush:
You have another option, to actually buy a toroidal or regular transformer with two secondary windings or one winding with center tap, then use a bridge rectifier and two capacitors to get your +24v and -24v.
Your amplifier probably works with less than 24v and -24v but naturally, will output less audio power.
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