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I've done much searching on this topic but haven't found exactly what I'm looking for. I want to update my old NAD 1020 with a motorized volume/remote. Installing the volume control itself seems straightforward but I'm stumped about how to get power to it. I want to tap into the preamp power supply and connect an LM317 for the 5 volts needed but am not sure what the best way to do this is (or even if this is the best option). I'm considering an ALPS 27K or maybe one the kits off ebay.
Schematic of power supply is below.
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Here's my solution in my DIY Line Stage.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Thanks for the reply. I think I'm following what you did but could just post a bullet-point list of the steps involved?
My friend Kevin Carter over at K&K Audio had a customer who wanted him to design a preamp that he could market. He wanted remote volume control as a feature and wanted a stepped attenuator instead of a pot. Kevin had Khozmo Attenuator make up one of their attenuators with a DC servo motor. Then the guy flaked out and canceled the project. Kevin sold me the unit and provided the micro processor control board. My line stage already had remote controlled volume via a motorized Alps pot.,so tapping into the volume up/down data signal and directing it to the PIC controller was easy in my case.
Kevin has some time and money invested in this. He might be willing to sell a control board if you contact him.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Don't tap into the NAD PS, just use a wall wart. Also don't assume the pot install will be easy, open up the unit and have a look around first.
ET
You could tap into the node marked 28.4 for power but I'd be tempted to use a 5V regulator for that instead of an adjustable (lm317) to make my life easier.
Things to watch for. The added load stressing your bridge rectifier diodes, and/or overtaxing a transformer which may be already close to the edge. Not saying these will be problems but that you ought to check for them once you've modded to ensure reliability.
Those are nice regulator circuits. The NAD1020 must be of fairly high quality.
Do some searching on eBay. I believe that there is a kit around.
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