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Old 16th December 2013, 12:47 PM   #1
jerryo is offline jerryo  Isle of Man
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Default Amp pcb with on board power supply!

I'm looking around for any power amp pcb designs that have the power supply components integrated on the same pcb.
Ideally, amps that are also easy to set up. Anything between 20 and 100 watts power wise.

Any suggestions?

Thanks
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Old 16th December 2013, 01:53 PM   #2
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Power supply on the same pcb as the amp can be a minefield.
Take great care that the smoothing capacitors charging pulses don't get into the audio ground line or you will get lots of hum.
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Old 16th December 2013, 02:08 PM   #3
jerryo is offline jerryo  Isle of Man
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Thanks Nigel,
I appreciate fully what you say, this is why I ask if anyone knows of established pcb designs that have this sort of issue already addressed. There must be "approved of" designs out there. Aussie Amps have such pcb's for instance! ( not that I want to copy them )

A "Circlophone" pcb with on board power supply would be a thing. I'll post the idea there!

Cheers
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Old 16th December 2013, 02:49 PM   #4
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The FetZilla has the power supply on the main PCB.
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Old 16th December 2013, 03:05 PM   #5
jerryo is offline jerryo  Isle of Man
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Thanks still4given,
I'll take a look at the Thread.

Cheers
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Old 16th December 2013, 03:37 PM   #6
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There are larger threads here and here.
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Old 16th December 2013, 06:40 PM   #7
CBS240 is offline CBS240  United States
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Here is a stereo module I made myself. It is somewhat experimental in the principal of operation but it turned out very well. It still works wonderfully! One of these days I may get around to refining the PCB so as it is easier to assemble.

Nigel is right about the power PCB traces having to be separated. This is important even on amplifier modules that do not include PS and logic control circuits. It is vital that the return current from the filter caps are separated from the return currents of the capacitor bank. I typically separate the filter caps from the capacitor bank with a small (value) inductive resistor. If you design the circuit as a modular circuit and establish separate grounds for each back to the star, or better yet use a star on star scheme, you can prevent ground loops and noise from things like logic circuits and fans.

PCB pic Amp pic top Amp pic top 2 Amp pic bottom
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Old 17th December 2013, 11:07 AM   #8
AndrewT is offline AndrewT  Scotland
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If the PCB has the power on board then the designer can optimise the layout to give exemplary performance.

BUT !!!!!
that only applies to an amplifier that is independant of all others.
i.e. it must be a monoblock or it must have isolated supplies to each amplifier. Dual mono can work if the MAGs are kept separate and the sets of transformer secondaries are separate.
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Old 19th December 2013, 10:50 AM   #9
jerryo is offline jerryo  Isle of Man
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Thanks Andrew,
this was at the core of my thinking. Any given amplifier will work at its best when accompanied with a certain power supply that the amps designer has in mind. Of course a lot of amps will work with a range of power supplies that have different voltages and capacitance requirements (amongst other things), and others are more pernickety.
But as you say, an amp designer could optimise the power supply by incorporating it on the pcb with an idealised layout that suits the amp design

Aussie amps certainly have used this approach on some of their modules and they have an excellent reputation!

I'm actually surprised that there are not more amp designs that take this approach, as it seems to offer only benefits!
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Old 19th December 2013, 10:56 AM   #10
AndrewT is offline AndrewT  Scotland
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Too many compromises for me and certainly for the general Membership.

Have a look at the exemplary design and build of the F5x.
Almost every component must be the correct size and value and type for every location on the PCBs. No choices.
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Last edited by AndrewT; 19th December 2013 at 11:00 AM.
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