I bought a dual channel amplifier board and a power supply for it. The supply has one two-wire output. Each channel has a power input. The folks who sold me the parts said that the one supply would suffice.
The amp board is here: TPA3255 2x260W 2Ch Class D Audio Amplifier | eBay.
The supply board is here: 400W 48V/8.5A Quasi-Resonant Power Supply For TPA3255 | eBay
Would it really suffice? I assume the idea would be to wire the power inputs in parallel: plus to plus to plus?
The amp board is here: TPA3255 2x260W 2Ch Class D Audio Amplifier | eBay.
The supply board is here: 400W 48V/8.5A Quasi-Resonant Power Supply For TPA3255 | eBay
Would it really suffice? I assume the idea would be to wire the power inputs in parallel: plus to plus to plus?
I've read that it's a sonically bad idea to power two amps from one supply without isolation hardware. Should I be concerned about that here?
Don´t worry, most stereo amps in this world have only one power supply. Your amps allready have some decoupling capacity at the PCB. The 4 dominant cans with silver top and brown coat.
Use decend wires, twist them together (power + ground- speaker positive out + speaker negative out- input hot + ground). Keep wires short and don´t bundle them. Have a look at some of the assembled amps here, BEFORE you start. If it looks clean and tidy to you, it will probaply function well. Beware of shorts, also from the under side of the PCB. Use a metal housing to keep high frequency radiation to a minimum.
Good luck!
Use decend wires, twist them together (power + ground- speaker positive out + speaker negative out- input hot + ground). Keep wires short and don´t bundle them. Have a look at some of the assembled amps here, BEFORE you start. If it looks clean and tidy to you, it will probaply function well. Beware of shorts, also from the under side of the PCB. Use a metal housing to keep high frequency radiation to a minimum.
Good luck!
Be aware of the primary side of the SMPS !- its about 200V there !!
in other countries about 300-400V
Thank you all for your responses. I appreciate them. A note: the manufacturer responded, saying (in effect) that the two power supply inputs are really just one, so only one needs to be connected.
With respect to the 200V, thanks. I don't want to die. So this raises a second question. I would like to understand how, comprehensively, to handle ground. Can any of you point me to guidance on how to get signal, power, and chassis ground all set up safely and also effectively with respect to avoidance of noise.
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