Are there any? I've tried looking for one but with no success. The alternative is getting two 24V power supplies and wiring them in series, but that seems awfully inefficient. (It's for a 35W@8 ohm guitar amp).
Yes, that's literally what the OP asking.
Personally, given it is a small amplifier, only 35W RMS, I would just get a 16+16 to 18+18 VAC 50 VA regular transformer, which is small, plus 4 diodes and a couple 2200/4700 uF by 35V caps and build a simple power supply.
Light, small and inexpensive, not worth going the SMPS route.
jm2c
Personally, given it is a small amplifier, only 35W RMS, I would just get a 16+16 to 18+18 VAC 50 VA regular transformer, which is small, plus 4 diodes and a couple 2200/4700 uF by 35V caps and build a simple power supply.
Light, small and inexpensive, not worth going the SMPS route.
jm2c
At most, a 24-0-24 transformer, could blow amp.
Or find a 48V charger, common in solar, and split it.
35W is only 2 Amps, not worth SMPS, and transformer sound will be free of harmonics.
Meanwell is famous in SMPS, and there are many others in that line, but like JMF above says, transformer is enough, simple, good performance.
Or find a 48V charger, common in solar, and split it.
35W is only 2 Amps, not worth SMPS, and transformer sound will be free of harmonics.
Meanwell is famous in SMPS, and there are many others in that line, but like JMF above says, transformer is enough, simple, good performance.
Yes stay away from SMPS ...... too much noise. Transformer ... old doorbell supply add big uF cap
I got 24volt 6.5 ampere Meanwell smps for five euro from a bargain offer.
Took ten of them for several projects with small class D amps.
Its so difficult to find affordable transformers in germany. They are sold expensive.
The said 50VA 18 0 18 would cost 20 to 30 euro. And then you need an extra housing.
But for projects with small class D amps where one costs below ten euros I won't spend too much on a bulky power supply.
Took ten of them for several projects with small class D amps.
Its so difficult to find affordable transformers in germany. They are sold expensive.
The said 50VA 18 0 18 would cost 20 to 30 euro. And then you need an extra housing.
But for projects with small class D amps where one costs below ten euros I won't spend too much on a bulky power supply.
That's the point, a good SMPS shouldn't be that noisy (and at most you can add some large-ish cap on the power rails to further filter the noise, plus regulation for the preamp). A linear power supply can be more expensive than an SMPS (I was looking more at 100VA, honestly, because a guitar amp, contrarily to a hi-fi amp, is often operated at high volumes).
i find that smps are actually quieter than the traditional ptx operating at 60hz..
i derate them by as much as 50% than the manufacturer claimed ratings..
i derate them by as much as 50% than the manufacturer claimed ratings..
I have the meanwell working with the often critcized CS8673 (zk mt21) without proper output filters.
In my configuration I have very low distortion and clean sound.
I really cannot complain about the sound.
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7711043
In my configuration I have very low distortion and clean sound.
I really cannot complain about the sound.
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7711043
Quote: you can buy two 0-24vdc smps bricks and stack them up, this is how i do my amps...
I am thinking the “center tap” cannot be used to the ground of the amp, as the CT is at 24V . Could you just get a 48V supply?
I am thinking the “center tap” cannot be used to the ground of the amp, as the CT is at 24V . Could you just get a 48V supply?
Last edited:
Not sure I understand. Why would two 24 V PSUs in series be inefficient? I'd say the "efficiency" would be the same as that of each PSU unit.