Also small update from my side, I have acquired a new set of transformers, and switched out the one from the phase that was overheating. Now the amp remains cool, and the motor seems to work correctly.
What is concerning me is that the one odd amp overheats to maybe 40°C (warm to touch but not hot). Might this be due to the fact that it is smaller than the others (18va vs 25va), or could this point to some other problem?
What is concerning me is that the one odd amp overheats to maybe 40°C (warm to touch but not hot). Might this be due to the fact that it is smaller than the others (18va vs 25va), or could this point to some other problem?
Hi, I'm new here. I have a question regarding assembly. I understand the capacitors in this design are non-polar from what I've been able to find online. However, I noticed the schematic indicates there is a preferred orientation for each capacitor. Is the orientation of the capacitors of any consequence? Thanks!
The caps are non polarised and can be fitted either way round. The schematic shows them 1 way round as that's what the drawing s/w does.
Initially posted under audio Power Amps; I'm posting here for additional views: If someone would let me know if they own an iteration of the model of class d amp specified in Pyramid's original SG4-assisted motor controller design that they'd be willing to part with, or have a recommendation for an alternative inexpensive amp (even a kit would suffice) easily found online that would work for this project, I would appreciate it. Thank you all so much for all of the help thus far, and thanks Pyramid for the project!
Can I ask, can PCBs be ordered somewhere in Europe or in China? I have to pay customs from the USA. Thank you M
Yes you can, I bought 10 off slightly bigger pcbs from PcbWay, as a first order it was free except for p&p.
Just send them the gerber files as a single zip (first page).They arrived in about 10 days.
Just send them the gerber files as a single zip (first page).They arrived in about 10 days.
Hi Ralphcooke
I am very interested in buying a SG4 chip if you have more in stock. If you also have SG4 pcb I would like to buy one as well.
Can I have you PM me due to newbee restrictions?
Kind regards
Stig
I am very interested in buying a SG4 chip if you have more in stock. If you also have SG4 pcb I would like to buy one as well.
Can I have you PM me due to newbee restrictions?
Kind regards
Stig
Hi Stig, yes I have both the SG4 chip and the latest version of the board.
The chips are £15 each and so is the board. There's £5 charge for shipping.
If this is OK let me know your address and I'll get them in the post to you early next week.
Payment is by PayPal to 'ralphfcooke@yahoo.com.'
(dont forget the 'f' in the middle)
Regards
Ralph
The chips are £15 each and so is the board. There's £5 charge for shipping.
If this is OK let me know your address and I'll get them in the post to you early next week.
Payment is by PayPal to 'ralphfcooke@yahoo.com.'
(dont forget the 'f' in the middle)
Regards
Ralph
Hello ralphfcooke
Sounds really good - a big Ok and a paypal with payment and my address is on its way
Thank you
Stig
Sounds really good - a big Ok and a paypal with payment and my address is on its way
Thank you
Stig
Hi Ralphfcooke
I am also very interested in buying two SG4 chips and also two boards.
The same here can you PM me due to newbee restrictions?
Best Regards,
Christian
I am also very interested in buying two SG4 chips and also two boards.
The same here can you PM me due to newbee restrictions?
Best Regards,
Christian
Thanks for the response. Do you recall if this amp must be altered in any way for this project?
Hi Enby2, my build was to power a Linn Sondek motor. The amplifier is used without modification, but I use resistors between the SG4 and the amplifiers to lower the final voltage down to 100 v ac. I will find the values of the resistors and draw a small diagram. The value of the resistors will depend on value of the step up transformers.
Attachments
I can't think of any situation where the SG4 changes phase; I'd be more suspicious of the amp/transformer setup.
Is there any sign of overheating in either channel when this occurs? Certainly check all the solder connections.
Do you have a 'scope to check the signals along the way?
Is there any sign of overheating in either channel when this occurs? Certainly check all the solder connections.
Do you have a 'scope to check the signals along the way?
I will resolder every connection and I have a scope so I can see whats going on. But boring to wait for the error again, Thanks for reply
Folks:
Can anyone explain to me why my SG-4 reverted to "factory default mode" (FAC on the display) on start-up? It has happened twice now. I only turned on the unit both times and was not depressing the Up and Down buttons.
Regards,
Scott
Can anyone explain to me why my SG-4 reverted to "factory default mode" (FAC on the display) on start-up? It has happened twice now. I only turned on the unit both times and was not depressing the Up and Down buttons.
Regards,
Scott
