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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Arduino based LDR volume and source selection controller
Arduino based LDR volume and source selection controller
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Old 18th October 2018, 06:23 PM   #1091
Blamm is offline Blamm  Netherlands
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Most people here build this as a separate preamp, with its own power supply and housing. I am considering building it and integrating it into a case with the TPA3118 boards I already have running.

These run on a 24V power supply like these. Instead of creating the supply mentioned by Vincent here, would it be a terrible impact on performance to fork the needed voltages off this supply using a couple of those cheap and simple adjustable step-down converters?
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Old 18th October 2018, 06:25 PM   #1092
zdr is offline zdr  Belgium
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As long as the power is stable and clean, there should be no impact imho.
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Neb. [LDR Volume Control OLED firmware:]
https://drive.google.com/open?id=0B7...ENmRXNYUEtySVE
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Old 18th October 2018, 06:46 PM   #1093
Blamm is offline Blamm  Netherlands
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Yeah I think that's the case. Might just give it a go, worst case I can build a new power supply for it all
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Old Yesterday, 12:52 AM   #1094
wineds is offline wineds  Australia
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I think you could fork the 12v analog ok but I would keep the digital and relay supplies separate. In the original power supply design both these supplies come from a separate transformer winding.
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Old Yesterday, 03:58 AM   #1095
wineds is offline wineds  Australia
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Note also that the reservoir capacitor for the +8V digital rail (C3 in original design) is important in terms of power down detection and saving of program variables to non volatile memory.
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Old Yesterday, 06:02 PM   #1096
Blamm is offline Blamm  Netherlands
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Thanks, the buffer op 8V is something to keep in mind indeed! Could be added of course.
Separating the 12V lines properly, to avoid interference I presume, might be more tricky without double windings. A couple of diodes might not fix that.

Guess it's not really worth the effort in that case. Might as well just build the second supply for the preamp.
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