This may be difficult to do with a standard boost controller since it is close to the upper limit of most boost supplies. The power supply for the power amplifier may need to be +-19V (i.e. Feed in a 50Hz sine wave signal, and adjust the volume control till it reads the required output voltage. The simplest way to get a sine wave is, ironically, using an audio power amplifier. The next best is to disassemble the mixer and see the internal power supply schematic, this can save some money and space with much simple solutions.ġ2V AC has a 17V peak, on either side of neutral. It's the best option from the size, noise ,time spent and cost. What you can do is to find the smallest inverter, the smallest I could find was 50W so you won't have cooling issues, and use-it with a 12V transformer which you already did. Modifying an inverter from 230VAC to 12VAC is almost impossible and certainly will alter the EMI compliance. Just think what happens if you have a half-wave rectifier inside and you connect the ground to the "hot" wire.Ī pure analog solution like a 50Hz generator followed by an amplifier and then a 50Hz transformer to raise the voltage from 12V peak to peak (bridge configuration) to 17V peak to peak has a very low efficiency and requires a hard to find 12v to 17V 1A transformer. Most likely with the signal ground tied to 12V ground.īut without looking inside the mixer box you don't know how is the AC power input related with the signal ground so your AC supply must be insulated from 12V battery/signal ground otherwise you might short or overload some internal circuits inside the mixer. In the same time I guess that form the same battery you will supply other devices to. You won't get the low level EMI that can be reached (and imposed by regulations) on a commercial product. They're noisy.īut a home made switched mode power supply is worse. It's a bad idea to have a switched mode power supply near an audio device. The solution you already have is the best trade-off in the given conditions and let me explain:
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