Hi,
I have just started the process of renovating a Lenco L78 turntable. Plinth, bearing, idler wheel, tonearm, etc. I have spotted the SG4 motor controller, which I understand works very well with Lenco AC motors. Can please someone tell me whether that controller is available as a complete component, so that I do not have to gather the parts and build it myself? (I live in Athens, Greece).
Thank you!
I have just started the process of renovating a Lenco L78 turntable. Plinth, bearing, idler wheel, tonearm, etc. I have spotted the SG4 motor controller, which I understand works very well with Lenco AC motors. Can please someone tell me whether that controller is available as a complete component, so that I do not have to gather the parts and build it myself? (I live in Athens, Greece).
Thank you!
You'll need to obtain the parts and build it yourself. The people who frequent this thread will provide all of the support you'll ever need if you have questions along the way.
@SRMcGee, thanks a lot for the response and the encouragement for trying to build it myself. I am afraid that I have neither the necessary knowledge nor the tools to proceed with the build. I'd prefer to follow the OP's (@Pyramid) advice "Do not attempt this part of the project if you are not trained in handling power electronics: Seek competent technical help if needed."
So, I apologize in case I am going against the forum's rules about DIY, but I am wondering whether someone competent enough can build the controller for me. If my request is unacceptable for posting it here, I kindly ask the administrator / moderator to delete it. Thank you.
So, I apologize in case I am going against the forum's rules about DIY, but I am wondering whether someone competent enough can build the controller for me. If my request is unacceptable for posting it here, I kindly ask the administrator / moderator to delete it. Thank you.
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I have several tables that I'd like to build these for. I was looking at the Mouser parts list, and the VN0106N3-G MOSFET is showing as out of stock and not due to be back in stock until 2024. Is there a preferred substitute for that part?
I'm certainly no expert, but are you saying that the -P003 variant (https://www.mouser.com/ProductDetai...VN0106N3-G-P003?qs=Q7eD95YXrua%2Bjseq8E4gMA==) won't work?
Regards.
The version specified in the project listing on Mouser is out of stock and shows that it won't be in stock until Feb. 6 2024.
I'm not certain. That's why I'm asking.
Now out of stock, hopefully available by the end of Feb, early March.
These chips are starting to become a problem to source.
There are a few people who have requested these, I'll post here when I have some stock.
Got a weird issue. Built this 2+ years ago now and it has worked without fault since, except… the last month or so. Now after running for an hour or two or sitting in standby for a couple hours it slows down significantly. Also have digital tach hooked up and it will slow by 2 to 3 tenths of an rpm, whereas previously it never deviated by greater than +/- 0.02 rpm. Any ideas? Bad capacitor??
Sam,
Digi-key has the exact mfg. part number in stock...you don't HAVE to buy the part from Mouser..
Just an option for you.
Scott
Digi-key has the exact mfg. part number in stock...you don't HAVE to buy the part from Mouser..
Just an option for you.
Scott
Scott,
I thought when I looked at DigiKey they were out of stock as well. Obviously, sourcing them from one supplier is efficient, which is why I was wondering if there was an officially endorsed substitute part from Mouser stock. I appreciate you checking other avenues!
I thought when I looked at DigiKey they were out of stock as well. Obviously, sourcing them from one supplier is efficient, which is why I was wondering if there was an officially endorsed substitute part from Mouser stock. I appreciate you checking other avenues!
I have a old Rega Motor Premotec 9904series in a highly modified turntable. Its set for 220AC config with the 6,8Kohm series resistor for the 110V motor. When applying a sg4 controller I see no use of this and get rid of the series resistor (and cap for 90deg)to get it run directly at 110V. Is this correct? When applying step up transformer I can use a 110+110v primary to 12+12v secondary 30VA trannie together with suitable amplifier like this link
Do I need 2 transformers for this or is the double secondarys fine, How do I apply this? Any suggestion for transformer?
Do I need 2 transformers for this or is the double secondarys fine, How do I apply this? Any suggestion for transformer?
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I'd recommend the amp in the following link or similar. I know it works and am not sure about the one you mentioned.
https://www.amazon.com/gp/product/B082QR5WVL/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
You can eliminate the resistor and capacitor in your diagram. You'll need 2 110/12 v transformers - one for each phase. 0 degree phase goes to one channel and 90 degree goes to other channel on the amp. output from one amp channel goes to both secondaries of transformer (in parallel). Same for the other channel. Then connect secondaries in parallel to red and grey. Secondaries of other channel go in parallel to blue and grey. I'm doing this from memory, but I think the 0 phase goes to red wire.
I think 10VA is adequate for transformers but I'd use 25VA to be sure. These transformers don't need to be anything special.
https://www.amazon.com/gp/product/B082QR5WVL/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
You can eliminate the resistor and capacitor in your diagram. You'll need 2 110/12 v transformers - one for each phase. 0 degree phase goes to one channel and 90 degree goes to other channel on the amp. output from one amp channel goes to both secondaries of transformer (in parallel). Same for the other channel. Then connect secondaries in parallel to red and grey. Secondaries of other channel go in parallel to blue and grey. I'm doing this from memory, but I think the 0 phase goes to red wire.
I think 10VA is adequate for transformers but I'd use 25VA to be sure. These transformers don't need to be anything special.
Here's a better link for the amp.
https://www.amazon.com/dp/B01CZQAFCO?psc=1&smid=A30QSGOJR8LMXA&ref_=chk_typ_imgToDp
https://www.amazon.com/dp/B01CZQAFCO?psc=1&smid=A30QSGOJR8LMXA&ref_=chk_typ_imgToDp
Thanks for the help hirscwi. Wery helpful for me.
I consider using 16x2 lcd display and try to find any with the PCF-8574A chip but what I find is items with PCF-8574T. Will it work? Or do you know where to source those?
I consider using 16x2 lcd display and try to find any with the PCF-8574A chip but what I find is items with PCF-8574T. Will it work? Or do you know where to source those?
The current SG4 chip v1.05 will work with both the PCF-8574A and PCF-8574 chip 🙂
Not currently in stock, but hopefully available soon
Not currently in stock, but hopefully available soon