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newbie
Apr 11, 2014 17:44:07 GMT
Post by donrecardo on Apr 11, 2014 17:44:07 GMT
Hi
I just found the forum and website which look very interesting
I have a small PIC chip ( 10F322) making leds flash to imitate an arc welder and others to imitate fluorescent lights . I need a logic high signal to trigger them into action and the function decoder looks just the job as I can attach it to any handy pair of railway tracks to take the dcc signal and turn on and off the lamps I require anywhere on the layout
I want to build the 8 channel low power function decoder so downloaded the zip file which says it contains all I need to get started. I dont like using stripboard so prefer to make a pcb and go surface mount. My problem is I looked at the file "circuit diagram 1.05.gif" and also at "decoder with components.bmp" which are in the zip file Obviously one is for the high power and the other for the low power circuits , so I know I dont need the transistors but I noticed other small differences, for example in the ''circuit diagram 1.05.gif '' , pin 8 goes through R9 but on the ''decoder with components.bmp'' it goes through R12 .That doesnt really matter as they are both the same value , Also there is no ICSP socket shown on ''decoder with components.bmp'' I just worried before I try to make PCBs am I safe to follow the circuit 1.05.gif diagram as shown as its too late to change things once the boards are made
Regards Don
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suzie
Keen DIYer
Posts: 30
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newbie
Apr 14, 2014 9:02:46 GMT
Post by suzie on Apr 14, 2014 9:02:46 GMT
Don
If you are building a surface mount version you will need the ICSP connector to load the firmware, the stripboard version does not have the ICSP connector because the PIC can be removed from the socket and put in a programmer, the stripboard layout is simplified to eliminate unnecessary components.
The resistor between the output on pin 11 and the Vpp on pin 4 is vital to prevent high voltage from the programmer damaging the PIC.
There should be sufficient power from the 5V regulator to power a few external circuits.
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newbie
Apr 15, 2014 7:52:36 GMT
Post by donrecardo on Apr 15, 2014 7:52:36 GMT
Don If you are building a surface mount version you will need the ICSP connector to load the firmware, the stripboard version does not have the ICSP connector because the PIC can be removed from the socket and put in a programmer, the stripboard layout is simplified to eliminate unnecessary components. The resistor between the output on pin 11 and the Vpp on pin 4 is vital to prevent high voltage from the programmer damaging the PIC. There should be sufficient power from the 5V regulator to power a few external circuits. Thanks for that Suzie I was just checking that there was no known errors on the circuit diagram I will give it a go and let you know how I get on Don
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