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  1. bahstrike

    ethernet portal circuit

    thanks Alex, I will keep them all. What is a 'star connection' ? I tried to google it, did not find a real explanation but did find a datasheet which points at a single junction where all GND of an IC met,  and it was labeled Star Connection. Is it basically just all VDD traces to the caps do...
  2. bahstrike

    ethernet portal circuit

    is this many decoupling caps overkill?   i created one for each pair of VDD/VSS pins. datasheet didnt seem to specify, so im betting this is more an engineer's logical hunch;  would it be more reasonable to use half as many, with 2 sets of power pins per 1 cap? or just 1 is fine for the whole...
  3. bahstrike

    ethernet portal circuit

    this is my first attempt at ethernet  (didnt even try a MAX232 until a few months ago) i have ignored transformers for my past year-ish venture into digital electronics-  i did some crap in high school with them, but very little.  the 3rd or 4th one i wound actually brought something like 9v...
  4. bahstrike

    ethernet portal circuit

    i am ALMOST done with this, still need a voltage regulator or maybe some level shifters depending on what is chosen for SPI master.. the key to keeping it DIY-able  (imo, but im a lousy engineer) is finding a jack with built-in magnetics.  i have tried to use (even make) transformers in the...
  5. bahstrike

    attempting 44.1khz 16-bit digital audio

    really?  awesome! i am hoping there aren't any critical issues in the whole audio circuit. it will leave me to explore ideas for implementing a "sample pump" for the DAC,  probably a simple microcontroller to drive DAC clock lines and fetch samples from a queue in a hunk of external ram (a...
  6. bahstrike

    attempting 44.1khz 16-bit digital audio

    hi all, i dont know much about audio circuit design, but i am attempting to make a basic stand-alone digital speaker to be connected to a larger system. the speaker itself needs no indicators or knobs/buttons:  only receives audio data and few simple commands (such as volume control).  the...
  7. bahstrike

    First SMT board: a 5-day photo adventure!

    Well, I still haven't ordered replacement TRIACs yet-  need to come up with a parts list for the next project.  However, I did use the oven just a couple nights ago to reflow 14 LEDs and some chip resistors/caps for a  moving lights/persistance of vision  sort of project  (maybe more on that...
  8. bahstrike

    First SMT board: a 5-day photo adventure!

    I finished construction of the oven-  everything is installed and ALL parts are working  (whew...). The front panel looks kind of crappy, I was messy with epoxy, but the side panel looks great-  and it's hinged so I can open easily to reprogram the microcontrollers and when closed will stay...
  9. bahstrike

    First SMT board: a 5-day photo adventure!

    Finished the LCD driver!!  ;D
  10. bahstrike

    First SMT board: a 5-day photo adventure!

    It is a controller to be placed inside a cheapo 1200 watt toaster oven for (future) reflow baking. Features: - Thermocouple connector (uses MAX6675 conditioner IC for the accurate temperature reading) - On-board thermal sensor for monitoring temperature of controller board/area - MOSFETs to...
  11. bahstrike

    First SMT board: a 5-day photo adventure!

    DAY 5: Oh yeah baby.  It even works, too. Third picture shows the aftermath of my difficulty with the CPU chip. It had to be reworked 3 times to get the alignment right  (of course the other chips were easy). Despite being a bit freaked I might have killed the chip with heat, it still works...
  12. bahstrike

    First SMT board: a 5-day photo adventure!

    DAY 4: This was Saturday.. Being off work and having this grand project to work on left me with NO TIME for taking pictures. Try again tomorrow :)
  13. bahstrike

    First SMT board: a 5-day photo adventure!

    DAY 3: Did the toner-transfer. Etched and cleaned the PCB. Later I used some Liquid Tin. GOT THE FIRST BITS SOLDERED, AND WORKING!  Can you find the trace I accidentally cut through??
  14. bahstrike

    First SMT board: a 5-day photo adventure!

    DAY 2: Printed and aligned the toner-transfer templates (top and bottom). Also scored and snapped the copper clad.
  15. bahstrike

    First SMT board: a 5-day photo adventure!

    This was my first ever attempt at surface-mount soldering!  8) Each post represents 1 day in the process and includes one or more photos (log in to view). Shown is the progress from Parts to Product.  ;D DAY 1: Received parts from Digikey
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