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PCB Design Questions... — Parallax Forums

PCB Design Questions...

mhamen3mhamen3 Posts: 69
edited 2011-05-01 10:37 in Propeller 1
Hi guys,

I was wondering what you guys use to pull the props 3.3V output up to 5V. I've seen inverters or just not gates but I was wondering if anyone knows where I could get just a straight buffer that would do what I'm looking for.

Also, if I want to power twelve HS-5685MH (179 oz. in) 7.4V Digital Standard Servos of one power bus what guage wire would you recommend? I was thinking to just put through holes on the pcb with pins going through the board and soldering a good gauge wire underneath to each pin. What size capacitors would you recommend to smooth the output? Would anyone happen to have an example schematic showing from the battery to the bus?

Thanks,
Marc

Comments

  • davidsaundersdavidsaunders Posts: 1,559
    edited 2011-04-30 19:16
    You could use a 74HCT244, they will run at 3 to 5V and accept anything from about 3V up as valid 1.
  • RaymanRayman Posts: 14,877
    edited 2011-04-30 22:04
    If the reason for going to 5 V is to control the servos, you probably don't have to do it... The digital servos I have work just fine with 3.3V control input...
  • Duane C. JohnsonDuane C. Johnson Posts: 955
    edited 2011-05-01 10:37
    Like this:
    3.3V_to_5V_buffer.gif

    The first uses a MOSFET and the second with an NPN bipolar transistor.

    The resister values are not critical.

    Duane
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