Looking for somebody to look over my shoulder on my first board etching project. Yes, the original was done on Veroboard. I would like to have mine etched. This gives me the opportunity to use my newly learned Kicad skills.
The original schematic is like this:
My version is slightly modified. Here is where I need somebody to double check me.
Here is my PICkit 2 ICSP Datasheet Circuit Diagram.
If you see any errors or short comings in my design please inform me. Your opinions are appreciated. Thank you for your time.
At a quick glance it looks fine, my only query would be the reset components - as one of the reasons for using the 16F628 was it's internal reset (allowing MCLR to be used as an input pin) they aren't required.
Assuming you want to add them for compatibility with more devices?, then I would suggest adding the option for an external crystal and capacitors on RA6/7 - but, along with the reset components, you're limiting it's capabilities for the tutorials.
No, the resistor and capacitor for the reset circuit aren't needed, although the diode is more commonly replaced by a simple resistor now - at least on the later devices.
As for adding a crystal what mode would you recommend. LP, XT or HS and frequency?
Assuming you want to add them for compatibility with more devices?, then I would suggest adding the option for an external crystal and capacitors on RA6/7 - but, along with the reset components, you're limiting it's capabilities for the tutorials.
Just leave the resistor and capacitor (R1 & C4 - and D2 for that matter) on MCLR out of the board - they aren't going to be used, and 'may' interfere with the correct action of RA5. Add a 10K from the MCLR pin to +5V for the ISCP.
A quick look at its datasheet suggests that the Vishay receivers (e.g., TSOP 38xxx) may be good substitutes. The "38" denotes 38 kHz for the tuned frequency. Other frequencies are available.
Finalized my design choice. Consulted with an friend on some power section modifications and took his advice. See below.
Since for me this was also an exercise in learning and using Kicad. Why kicad? Because it did not restrain me to a small board size. The final schematic gerbers where sent off to Oshpark for manufacture.
I would only comment on the capacitor values round the regulator - there's little point fitting a 10uF and a 1uF, the values are far too close. Either on it's own would be perfectly fine, but if you want to use two, use a 10uF and a 0.1uF or 0.01uF.
I would only comment on the capacitor values round the regulator - there's little point fitting a 10uF and a 1uF, the values are far too close. Either on it's own would be perfectly fine, but if you want to use two, use a 10uF and a 0.1uF or 0.01uF.