Re: Electronic control pedal solenoid. -- Pianocorder Forum

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Subject: Re: Electronic control pedal solenoid.

Author:
Mark Fontana

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Date Posted: 03:21:03 01/06/25 Mon
In reply to: Wouter 's message, "Electronic control pedal solenoid." on 13:45:37 01/04/25 Sat

Are you talking about a 1970s Superscope/Marantz Pianocorder system specifically or about creating an accessibility accessory for a piano in general, using modern components? This isn't really the right forum for the latter, but in general (assuming you're building something new), you will want to use PWM to adjust the duty cycle of a fixed DC drive voltage to the solenoid. You could probably do it with an Arduino or other microcontroller, and if you use spread spectrum instead of a fixed frequency, you can minimize buzzing. There is no hard and fast rule for the duty cycles required for the initial actuation and subsequent hold level - these will vary depending on the solenoid, piano, voltage, coil resistance, etc. but you'll want to make both just a bit beyond the minimums required to ensure reliable operation but with minimal heating. The solenoid travel should be about 5 mm if you have a 1:1 ratio in the trapwork between the solenoid travel and the motion of the damper tray.

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