Hi Fred.
I am in working condition now. I will ship the boards this Tuesday and subsequently share tracking ID through PM.
I caught the virus by 5th Jan. Was recovering in the following days, but on the evening of 11th I was outside of home for some essential work and got caught in heavy rain in such an area where there is no shade for a kilometer. So came home with all my warm clothes fully soaked. Within a couple days got severe opportunistic bacterial infection in my sinus and middle ear. In the following two weeks I was literally flat on my bed with barely the strength to eat and use the bathroom. The infection went away within a week but I was struggling to concentrate on anything for a few days. Now things are much better so here I am.
Thank you and everyone else for waiting patiently!
Finally i have finished the project.
With 2X40 volt transformer i have 2X56v .
With the type for R9,10,11,12 : (Omron G2R-1-E 24V)
[(Vrail-Vrel)/(Vrel/Rrel)]/2 = [(56-24)/(24/1100)]/2 = ~733 so i have put 750 Ohm.
Nothing happens! the relay doesnt close!
What to do? what to check?
Thank you in advance
With 2X40 volt transformer i have 2X56v .
With the type for R9,10,11,12 : (Omron G2R-1-E 24V)
[(Vrail-Vrel)/(Vrel/Rrel)]/2 = [(56-24)/(24/1100)]/2 = ~733 so i have put 750 Ohm.
Nothing happens! the relay doesnt close!
What to do? what to check?
Thank you in advance
First thing I would do is check proper direction of all transistors and diodes, oh yes electrolytic caps. Then for solder shorts, splatter on pcb. The resistor values you calculated are fine, I typically check the resistance with a multimeter when I install resistors, rules out the chance of having bad resistors if I have to go back and troubleshoot. Other than that, if you can't identify a problem visually then you would have to deep dive into troubleshooting and get help from Shaan. If you've already done the visual check then I apologize for assuming you didn't.
Hi Shaan, my first time use this PSU board with rail 50VDC supply for the 12V relay and according to formular calculated the resistor value is 470 ohm.
I only test the PSU independent w/o AMP connecting. When power up 8s later the relay able to close, however, each time closing it has many times of on/off triggering (like oscillation) about 1.5 second, and finally it will be closed steadily. Not sure why will happen this phenomena.
I confirmed the relay coil pin is 12.3v and each 470 ohm resistor voltage is 18v3. Also i find this resistor so hot about 0.6W exhausted, so i will try to change 24V relay to try again. But i want to know why this stranger case present in my board.
I only test the PSU independent w/o AMP connecting. When power up 8s later the relay able to close, however, each time closing it has many times of on/off triggering (like oscillation) about 1.5 second, and finally it will be closed steadily. Not sure why will happen this phenomena.
I confirmed the relay coil pin is 12.3v and each 470 ohm resistor voltage is 18v3. Also i find this resistor so hot about 0.6W exhausted, so i will try to change 24V relay to try again. But i want to know why this stranger case present in my board.