I am using a VPI PLC to control the speed of my turntable, but its EI transformer has developed a hum. I was wondering if anyone has a schematic of the PLC, so I can find what type of replacement transformer I will need to replace the hummer.
Or is there a way to inspect the EI transformer to determine what replacement I will need?
Or is replacing the transformer more work than it is worth? Maybe I could just instead try to do something to absorb the sound of the hum, so it is not nearly as audible?
Look forward to your thoughts on this.
Or is there a way to inspect the EI transformer to determine what replacement I will need?
Or is replacing the transformer more work than it is worth? Maybe I could just instead try to do something to absorb the sound of the hum, so it is not nearly as audible?
Look forward to your thoughts on this.
I just had my transformer go wacky. It will sometimes turn the motor and other times just makes the spindle on the outboard (TNT 3.5) motor just Buzzes and doesn't move. I'm assuming one of the transformers is faulty. Let me know if you've heard of this. In meantime, I'll look for a schematic. I heard these were shotty units, but there's no reason they should be. And paying 1200 for a "digital" one for an analogue 15K stereo seems ironic and very overpriced!
Mark
Mark
I think mark6699331 is right. The PLC was a pretty shotty unit, it output a nasty looking square wave with spikes and lots of ringing. Reading about it, it was built like the old 12V inverters, not a very clean signal for the motor
You can download the schematic for it here: VPI PLC Schematic
You can download the schematic for it here: VPI PLC Schematic
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