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  1. chopnhack

    Who etches photoresist PCBs?

    RE: the toner/temps - That is very well researched TTL! I agree with your analysis, the machine you purchase should match your daily needs and not the occasional need. Do you have a local print shop? In the states we have Staples, Office Depot and FedEx office as well as independent print shops...
  2. chopnhack

    Basic concepts PCB building and dsPIC

    Also check http://www.expresspcb.com/ - they have some interesting information under tips for PCB design and resources for engineers. I agree that perf board should be your first experience with making circuits, but your circuit may have quite a few connections, it might get "busy" on the back...
  3. chopnhack

    Designing a Time Delayed Relay

    I find this confusing because I was taught that residential 220 service is actually two 110 lines, just coming from different taps from the transformer. Each black wire from the mains is 110v to neutral, however a solely 220v circuit never contains a neutral, just two hot and a ground. I always...
  4. chopnhack

    Greetings from Florida

    Thanks for sharing that! I was thinking about cutting off the binding to scan mine before it disintegrates, but now I don't have to :-)
  5. chopnhack

    Designing a Time Delayed Relay

    Thanks Kris! I will keep reading my books on theory, but I still don't understand the path the 220v travels. My confusion begins with the path the voltage follows. For instance on W5 does the wave go to all connected points? i.e. from w5 through r4 and back out to w6 at a reduced voltage...
  6. chopnhack

    Designing a Time Delayed Relay

    I see! So you are recommending to go with the hall effect chip for practical reasons. That makes sense. Avoids a lot of problems too! I would appreciate it greatly if you could make that change to the schematic. Just one question on the above schematic - if the 220v lines are broken and the...
  7. chopnhack

    Micro soldering

    When I had to do a repair on a board with some sm components, I found solder wick to be very valuable. It also helps to suck away some of the heat.
  8. chopnhack

    Designing a Time Delayed Relay

    Correct Yes, that is why I was not understanding how the circuit would work with motor 1 :) Can you explain how the optocoupler can be used in series without frying it? In parallel, it would not be effective in gauging current. That is a really cool chip! Can a SOIC be converted easily for...
  9. chopnhack

    Greetings from Florida

    I got my version of Forrest Mim's "Getting Started..." when I was a kid- it is a great introductory - it actually opened the world of electronics to me. I still have it - all the pages have since gone orange. The discussion of electron flow in an atom is dated compared to modern quantum...
  10. chopnhack

    Basic question on 2 battery system and potentials between points

    Thanks Steve! I feel like the book was misleading since they did write it as V (AD) and not V DA. At least I am not going crazy yet! Only 180 more pages of theory to go in this book :):eek:
  11. chopnhack

    Basic question on 2 battery system and potentials between points

    I started reading "Practical Electronics for Inventors" and had some questions pop up. I checked the errata first because I got all of the other sample questions correct in determining the voltages between different points. Applying the same logic did not yield the same result as the book showed...
  12. chopnhack

    Greetings from Florida

    Hi Richar I am newbie around here too, there is a good sticky link by Steve with a number of recommendations. https://www.electronicspoint.com/threads/book-reviews.251799/ I just hit up the library and got two of them: The Art of Electronics and Practical Electronics for Inventors So far in...
  13. chopnhack

    Who etches photoresist PCBs?

    Over a decade ago Radio Shack, an electronics provider in the states used to sell a PCB etching kit with copper clad plate and a resist pen. I had used that to make a few circuits. They come out well, the only bad part was disposing of the fluid. The gentleman in this video shows the more modern...
  14. chopnhack

    Designing a Time Delayed Relay

    Since I can't tap into the switched side of the 220v from the motor and still keep this unit portable could an inductive sensor be used to detect the current flow in the 220 line to act as the "on" signal? Would this type of sensor shield the circuit and eliminate the need for the optocoupler? I...
  15. chopnhack

    Designing a Time Delayed Relay

    I sort of understand. I will make another diagram to explain better what I am working with - essentially my limitations to why I need the device to be portable between machines...
  16. chopnhack

    Designing a Time Delayed Relay

    Is there a way for me to safely wire my 220v feed, w5 and w6 and the motor in series? That way the circuit will be between the power and the motor's switch - with the switch creating the open in the loop, when latched w5 and w6 will be powered. (The switch on the motor is a magnetic switch if...
  17. chopnhack

    Designing a Time Delayed Relay

    Ok, I will need to think on this some more to make sure I understand everything. I am having some difficulty visualizing the w5/w6 connection, thanks!
  18. chopnhack

    Designing a Time Delayed Relay

    That is a lot to absorb!! I really appreciate the care in design and the explanation :-) I love how the flow is altered by the logic of the circuit, very cool to understand an IC package, I might learn electronics yet!!! I need to ask a question about W5 and W6 to clarify. Motor 1 (220v) is a...
  19. chopnhack

    Designing a Time Delayed Relay

    Thank you again Kris! To answer your last question first, 60hz, 110/120v and I think both ideas are brilliant. I like option 3 as well, but safety first. Either option 110 or 220 would work. Using 110V would not waste any significant power because the entire circuit would only be live when the...
  20. chopnhack

    Designing a Time Delayed Relay

    Thanks to both of you for your quick replies! Kris, Wow.. Amazingly you have nailed it! And with clarity and fewer parts than I thought!! I was sure that a timer IC would be necessary, but if I read you correctly you are relying on a simple RC discharge cycle coupled with another cap to fire...
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