I used the motor/platter from a Technics SL-6 turntable to build my own turntable with my own tonearm.
This is a direct-drive motor where the rotor is a ring of magnets attached to the bottom of the platter.
I traced the wiring to figure out how to make a 12vdc wall wart power the motor.
Seems to work well.
At higher gain on my preamp (higher than I'd typically listen with my current 5v cartridge but maybe not for a cartridge with a lower output), I can hear a faint sort of static sound.
It takes about thirty seconds for the sound to start, after I start the motor. If I stop the platter with my hand, the sound stops. When I let go of the platter so it starts to spin again, the sound starts right away. If I push on the spindle or rim, the sound intensifies a little.
I have an inline switch wired after the wart, and if I switch this off, the noise continues as the platter coasts to a stop, and then the noise stops. If I then move/spin the platter by hand (with power turned off but the cable still connected), the noise resumes. If I disconnect the power supply entirely from the motor and spin the platter by hand, there is no noise.
As I said, I'm using a 12vdc wall wart to power the turntable motor. I've tried two different makes/model of wall warts, with the same result.
Something tells me this is some sort of interaction with my wall warts, but I'm unsure of how to troubleshoot it.
Any ideas of simple things I could try?
Thanks in advance.
This is a direct-drive motor where the rotor is a ring of magnets attached to the bottom of the platter.
I traced the wiring to figure out how to make a 12vdc wall wart power the motor.
Seems to work well.
At higher gain on my preamp (higher than I'd typically listen with my current 5v cartridge but maybe not for a cartridge with a lower output), I can hear a faint sort of static sound.
It takes about thirty seconds for the sound to start, after I start the motor. If I stop the platter with my hand, the sound stops. When I let go of the platter so it starts to spin again, the sound starts right away. If I push on the spindle or rim, the sound intensifies a little.
I have an inline switch wired after the wart, and if I switch this off, the noise continues as the platter coasts to a stop, and then the noise stops. If I then move/spin the platter by hand (with power turned off but the cable still connected), the noise resumes. If I disconnect the power supply entirely from the motor and spin the platter by hand, there is no noise.
As I said, I'm using a 12vdc wall wart to power the turntable motor. I've tried two different makes/model of wall warts, with the same result.
Something tells me this is some sort of interaction with my wall warts, but I'm unsure of how to troubleshoot it.
Any ideas of simple things I could try?
Thanks in advance.