Search results

  1. chopnhack

    Suggestions for building a PIC dev. board?

    Your schematic looks great, I like the use of buses to keep the layout clutter free. Is this board built around the 16f887 or are you able to swap in other pin compatible pic's. My initial thought was to produce a board that could accommodate as many pic chips as possible - obviously changes...
  2. chopnhack

    Suggestions for building a PIC dev. board?

    Hi Mike, LOL yes, thanks - it comes from my woodworking background, but it applies here too, well at least the hack bit! Ha :D Welcome to EP!! I can imagine, you did quite well to integrate multiple chip sizes, well done! Absolutely, I would love to see what you came up with! I ended up 8-Pin...
  3. chopnhack

    Looking for eyelets that work for .1" spacing

    They do make open brass rivets too. The conformal spray is cheap and easy - also has high dielectric value - probably will spray that on the project we are discussing Hop to reduce leakage current ;-) Maybe I can go back to etching less copper and relying on the coating!
  4. chopnhack

    Looking for eyelets that work for .1" spacing

    Brass rivets were on my list for producing home made vias: http://www.hansonrivet.com/tubular-rivets.htm Also, brass tube on e-bay than can be peened over on both sides of board, may work too. As for environmental hazards, this board material looks like it is porous. Wouldn't a FR type board be...
  5. chopnhack

    Anyone use this rework station?

    I found that one yesterday as well and bid on it. Lowest he will go is $35 plus $6.99 shipping. Nice thing is that there is an extra heating element and it ships from California.
  6. chopnhack

    Anyone use this rework station?

    Hey Dan! - Cool, thanks for the input. I noticed that the link you included had a spanner tool, upon close inspection, the nozzle of the gun seems to have segmented sections that are removed so that those little protrusions at the bottom of the nozzles can be pushed into the recesses and turned...
  7. chopnhack

    Anyone use this rework station?

    Looks like a Hakko knock off and I really love my iron made by them! Price is good too. Just curious if anyone has used one and what their experiences with it might be. Thanks! @hevans1944 - check it out...
  8. chopnhack

    Voltage Drop across NPN BJT C&E?

    Done and done, it is an interesting hack, good thinking outside the box Hop. LOL
  9. chopnhack

    PCB building

    Good job Constantine! Looks like you snuck in those smd's just fine. You should put these pics up on your project post too for all to follow with an updated schematic. I hope it works better now!
  10. chopnhack

    Voltage Drop across NPN BJT C&E?

    Don't do it - it's too hot and humid, everything gets rusty real quick!! I had to resort to putting a finish on my cast iron surfaces to give myself years of rust free service! Imagine what the inside of some of your test equipment would look like in short order!!! Inside is a must for...
  11. chopnhack

    Voltage Drop across NPN BJT C&E?

    Well I tried doing this today and found it to be very tedious with discrete resistors... It made me think that a pcb with a series of resistors mounted on it with a header strip to allow for pins to connect to the test circuit would be easier. Some type of variable power supply would be useful...
  12. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    If you are getting tight on space, consider using a pad on the copper side by the pin and solder a jumper wire to a remote location that has ground plane.
  13. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    Ah! You have already used that trick!! Can you take a picture of the copper side of the board? I have the last picture from the other thread: PCB building
  14. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    If you are getting tight on space, two suggestions:1. With your through hole resistors, go vertical, or 1. Consider a surface mount resistor chip - they are small and easy enough to work with at 0805 or higher sizes. 0603 might be challenging the first go around.
  15. chopnhack

    Voltage Drop across NPN BJT C&E?

    It's hard! The allure of completing a project versus correctly designing one!! LOL I appreciate the time you take to explain and offer guidance to the correct design. I am home now and can begin to play with my log-amp experiment. ;)
  16. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    Did you intend to leave your two transmit pins open? Pins 7 & 14 don't show connection to anything in your diagram.
  17. chopnhack

    Voltage Drop across NPN BJT C&E?

    That is critical information as I intend to develop a handful - is there really that much variance in a batch of LDR's these days? I will look at some inexpensive(?) Log amps today. As for the mosfet, I didn't realize that two voltages were needed and will nix it from the design. To be...
  18. chopnhack

    shockwave plugin crashing

    I only noticed it yesterday when I was posting and receiving new post alerts. The page became unresponsive until the alert processed. Why does the site allow direct png paste under firefox but not on chrome? Security issue or forum restriction? Thanks Ian!
  19. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    Are there any other direct replacements or will you have to redesign the board?
  20. chopnhack

    Automation seems easy but what am I missing?!?!

    Fair enough, but the link I looked at seemed to be some dodgy Chinese knockoff. I ordered a power supply like that one time and did not feel comfortable using it. They typically use cap. reactance to step down the voltage.
Top