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|17th July 2019, 07:20 PM||#1|
Join Date: Feb 2006
Delaying Lid Control
Hi to all,
I am working on a DIY CD-Player that is based on a BU-1 mechanism.
The casing is my own design, a toploader with motorized lid.
For this design, I cannibalize a Sony CDP-103.
What was the movement of a tray is now the movement of a lid.
Two switches signal to the mechanism contoller whether the
tray / lid is open or closed.
I am worried how to make the lid close exactly.
In many other designs, the closing movement of a tray does not
trigger the end switch. It is triggered by a following locking mechanism
that clamps the CD. And this locking mechanism is designed for
some play, so the switch does not have to be exactly triggered to shut off the
But I am using a very stiff, gear based mechanism without any locking
So the moment when the motor shuts off has to be exact.
But this precision is only needed when closing.
When the lid is opens I do not care whether
it stops at a 40° or a 45° angle.
So I thought maybe the closing can be delayed so that the lid will
always completely close even when the trigger comes a bit too early.
First I thought of delaying the trigger signal, but this would force the motor
into short circuit everytime the lid closes.
But maybe an clectrolytic capacitor in parallel to the motor could force the delay, without stressing the circuitry.
There is not much of delay needed.
So, is my attached drawing correct? I did draw the modification by hand.
Problem is that the electrolytic capacitor has to be protected from the negative voltage when the lid opens.
So I am not sure of the placement of the diode.
The orange line carries the positive voltage for opening and
the negative voltage for closing. The chucking motor is not needed for my design
so I greyed its circuitry out. Would a capacitor + resistor parallel to a motor work as a delay?
All the best,
Last edited by Salar; 17th July 2019 at 07:30 PM.
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