I am an audiophile and a tinkerer. I am an old hand at mechanical fabrication & electronics, but have no background or experience using an arduino board. Let me first lay out the design parameters:
The object of this project is to develop and fabricate a simple cheap and functional end of record tonearm lift for manual turntables. This could be done by actuating the existing manual tone arm lift mechanism, but it would be preferable to have a separate lift device that functions independent of the existing manual lift
Here are the basic functions a servo or gear reduction motor would have to do and what signals it would have to respond to:
The servo would need to have an arm mounted to its shaft that when rotated would lift the tone arm. A very small angle of rotation is required if it is independent of the manual tonearm lift. If it engages the manual tone arm lift it will need to rotate a greater distance. The distance is dependent on the make & model of turntable/ Tonearm.
The default mode of the motor is in the down position
When the tone arm reaches the end of the record a proximity sensor or proxy switch will signal the motor to raise.
The motor must remain in the high position as long as the tonearm remains at the end of the record.
Upon returning the tonearm to the beginning of the record the motor must return to the down position and remain there until the tonearm reaches the end of the record again and the process is repeated.
Perhaps someone has already done this. I would be interested to hear about your experiences.
At first I was going to do this with a small 3 volt gear reduction motor and control it with relays. However when researching the topic I kept coming up with Arduino motor and servo controllers. So here I am!