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In this situation to get more safety, but not enough, from mains neutral to be connected to GND. Use transil (~400V/100A) to maximim eliminate voltage spikes and resistor to gate of BTA to be >=0,5W , because burn to me several times.
Sorry for not complete explanation.
Termination resistors are 120ohm on both side of net. 680 ohm resistors are to keep level >=200mV and not to have noise problem and are optional. When is used it become part of termination with 120ohm resistors and must be calculate. It gives very important...
485 IC must be use properly with 120ohm on both side and on one side Apin<-680 ohm ->+5V , Bpin <- 680ohm -> GND. Now 485 work stable! Advanced is if use 485 IC with embedded protection of bad termination + fault safe ... example SH65HVD3082
Old replay but... RS485 MUST be terminated not just 120 ohm on both side of net but on one side with 2 x 680ohm (or 750ohm). 485 chip out pins (A, B) to has this: A <- 680ohm -> +5V and B<-680ohm->gnd. No noise any more.
Negativ print in PCAD 2006
I had a issue with how to print negative, for pcb photosensitive film, in PCAD2006. Here is solution:
preparation:
1-In top silk (white color layer) draw polygon over all PCB
2- choose bottom and refresh screen
print:
1-Print job options: ( for my print I need...
Naravno. Probelm je sta sa stari DOS programi...
Of Course, DOSbox is free an works fine. Problem is what to do with very useful DOS programs in WIN 7. DOSbox is solution and I hope I point good solution for TANGO PCB
Why Tango ? I still have file to convert in Tango PCB to be able to see it in P-CAD . SO, I had problem to run Tango PCB on Windows 7. Up to win XP was OK. Page I sent explain how to do it. If it is for someone still issue I can post edited files in DOSbox and Tango.
I made PWM soft start for light (bulb or led) with PIC16f877a. Send you code.
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; PWMv2 01-2011
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; 25KHZ generation. DC change...
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