Suggestion Required to buy these 3 things

Discussion in 'General Electronics Chat' started by drmoobi, Aug 12, 2012.

  1. drmoobi

    Thread Starter New Member

    Aug 12, 2012
    Suggestion Required to buy these 3 things with readily available stuff ?

    1. Filters for 0 – 5V signal and over voltage protection for the analog signal for arduino.
    2. Dual Power supply with reverse voltage protection 1Amp both 3.3V and 5V.
    3. RS232 circuit TTL converter.

    thx everyone..
  2. MrChips


    Oct 2, 2009
    For RS232 converter, I use MAX232 or MAX233 (if you want to eliminate four capacitors).
  3. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    A complete RS232 to TTL shifter is available from Sparkfun Electronics, as well as others. and can be seen at this link: RS232 Shifter
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    Which analog signal is this? What are you looking to protect it from? ESD? Lightning strikes?

    What is driving this supply? Some AC line? Batteries? Solar cells?

    Is this supply itself potentially vulnerable to reversed polarity, or is the unit connected to it's output vulnerable? Note a supply cannot protect you from connecting it backwards, it only "sees" the world thru it's two output terminals (and they never move).

    Plugs with defined orientations are available.

    It may be cheaper to get a 5V supply and add an external regulator for the 3.3V.

    MrChip made some excellent recommendations.