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help with circuit design

Discussion in 'General Electronics Discussion' started by kitchensink, Apr 15, 2013.

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  1. kitchensink

    kitchensink

    1
    0
    Apr 15, 2013
    Hi,
    I am new to this but reading a lot. My son wants to build an Electrolysis project for this school. He wanted some help on this. I am looking for a timer that reverses polarity after a few seconds for a set voltage. So here is an example:

    1. +10 volts for 3 seconds
    2. - 10 volts for 5 seconds

    what to use a relay since I dont know what current it is going to draw.

    He wants to be able to adjust the voltage and the time for his experiment. the max voltage is 12 volts. So are there any circuit designs out there

    Thanks
     
    Last edited: Apr 15, 2013
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,270
    Nov 28, 2011
    Hi and welcome to the forums :)

    Yes, you can do that. It's not difficult. You can use the ubiquitous NE555 (just called the "555") to control the relay(s).

    Does this reversing voltage need to be a "one-shot", i.e. a single sequence triggered by a pushbutton, or a continuously repeating sequence?

    How are you planning on varying the voltage? Your control circuit will need a fairly constant voltage, probably 12V is a good choice. This will need to be a separate power supply if you're varying the voltage you send to the electrolysis circuit.

    What country are you in? (There's a place for this information in your profile.) Do you have a preferred supplier for electronic components? I often recommend Digikey in the U.S. if you're over there, but I can give you part numbers for Radio Shack parts, or parts from any other supplier, if that's easier for you. Most electronic component suppliers have the 555 and suitable relays.
     
  3. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    This circuit can be easily modified to fulfill your requirements.

    Chris
     

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