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follow up to schematics for Multi switch 555 I.C.timer/ childrens toys

Discussion in 'Electronic Basics' started by mark3, Dec 22, 2005.

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  1. mark3

    mark3 Guest

    Hi to all
    Thanks for responding to my questions, I must
    apologize for my explanations I'm in a learning process about
    electronics. I'll be running a power adapter from 240 AC input
    Converting into adjustable 3v -12v DC output ,current is 1amp but will
    probably run the 555 timer cover the maximum voltage of one of the
    toys(9v) the other three toys in the circuit will run at 1x 3v and 2x
    6v with each toy been activated with a independent push button switch
    ..The circuit I would like to build is for a 3yr old girl with multiple
    physical and intellectual disabilities , she is able to push buttons;
    which stimulates her with color and sound. My aim is build a
    electronical unit in which I'm able interchange various toys with
    various voltages from 3-9V either home made by myself (DC transistor
    radio, motorized bells) or bought, that will help stimulate her
    The 548 transistor I referred to is a NPN the full info. is BC 548
    -506 .The trigger switch I refer to is what I understand is called a
    toggle switch which sends a pulse through pin 2 of the 555 timer you
    can find a example of this circuit at this will give you some idea of
    what I'm talking about. To this circuit I would to add 4 toggle type
    switches to activate and interchange 4 different toys which use volts
    between 3-9V.

    I hope this makes it a little easier to understand what I'm trying to
    achieve if you need more clarification /information please let me know
    ..If you have some schematics for this idea is possible to send in
    format similar to the http:// example I have given you as I find it
    difficult to understand schematics in the format that has been sent me.

    Thank you
  2. Allen Bong

    Allen Bong Guest

    I have a hard time understanding what you want exactly.

    Are your toys battery or AC powered? If you can run your toys on AC,
    then what you need is a multi-voltage AC adaptor. We can buy adaptors
    here with 3, 4.5, 6, 7.5, 9, & 12V just sliding a switch.

    If what you want is a DC/DC converter that convert 3V battery voltage
    to 3, 6, 9 volts by pushing some buttons, you need to do a search on
    "SMPS +schematics". There are many on the net and most involve winding
    a ferric transformer or inductors.

    Hope that help


  3. There is an organisation called "TASH" (Technical Aids & Systems for
    the Handicapped" ( that deals with
    this sort of thing. You may find something there to help you.

    About 10 years ago I designed a unit for the local Kinsmen Rehab group
    that could be controlled by one or two switches and scanned through 8
    functions. It was an improved version of a TASH product called a
    "Kincontrol". It had relay outputs, and just provided contact
    closures, so its outputs could be connected in parallel with the
    existing switches on your daughter's toys - no need for the device to
    provide (or care about) the toy's power requirements (as long as they
    don't exceed the relay contact ratings.

    Peter Bennett, VE7CEI
    peterbb4 (at)
    new newsgroup users info :
    GPS and NMEA info:
    Vancouver Power Squadron:
  4. ehsjr

    ehsjr Guest

    I sent you a .bmp file (attached to an E-mail) with the

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