Finished Pieces

LittleMega


    These ‘phones are similar to the others I’ve worked on in the past, but are a big step up. These can process your voice but also have a sound FX generator.
    It makes CAR, SIREN and MONKEY sounds.


    I started by adding a pitch adjustment to the voice changer and another one to the sound FX circuit.
    Then I had to cut some connections and rewire some points to re-rout the sound FX so that they would go through the processor.
    I’ve also modified the circuit to give the user access to a “robot” voice changing effect. This effect is built into the voice changing chip but was not utilized in the original toy.

    SCHEMATIC


    This schematic is incomplete. The drawing was made from some old notes I took while working on one of these. There’s a lot of lead cutting and rewiring in this piece if you want to patch the sound fx circuit into the pitch changer. Also you can rewire the pitch changer slider switch to include the “robot voice” effect.
    I’ll try to update the schem to show how to cut and wire the circuit in the near future.

    The sounds below were made using the self contained soundFX circuit processed through the internal pitch changer.

    Sounds

    6 Responses to “LittleMega”

    • 1

      * casperelectronics.com » Archive » Little Tikes Megaphone said:
      November 22nd, 2006 at 1:04am #

      […] Added a new piece to the finished pieces section. ALSO: photos and added to megaphone page. Photo and sounds added to the Barbie Karaoke page. […]

    • 2

      * casperelectronics.com » Archive » LittleMega schematics added said:
      November 23rd, 2006 at 10:43pm #

      […] Schematics for bending the Little Tikes megaphone . […]

    • 3

      peterquistgard said:
      December 14th, 2009 at 12:40pm #

      whoa, that looks great!
      and i actually just found one today !!
      looking forward to bending it

    • 4

      casper said:
      February 18th, 2010 at 1:36am #

      @peterquistgard: Good luck bending this thing! This piece is awesome! I sold my last one and really want to make another just for myself. It can do a lot of weird stuff.

    • 5

      newvoodoo said:
      May 13th, 2013 at 8:13pm #

      I know you may not have much time to answer questions like this one-but ive gotten a couple megaphones of similar type (toy ‘voice changing’ w/pitch changers etc) but the ones I have do not have simiar boards to the ones with schematics here.
      For example, they have SMD instead of 1/4watt resistors & thru-hole stuff etc, and instead of legs I can see to solder to and so forth -the IC seems to be in a plastic cover or something-its a black plastic glob-circular in size.
      I am REALLY poor-so the 5 bucks I spent is actually something to me-so I cant really afford to totally mess up.
      My question is-before I try to do/follow your instructions-am I wasting my time & messing up any use they may have in the future ? Are they still viable for bending if they are so dissimilar from the generalized PCBs youve taken photos of ?

      thanks for any guidance you can provide-sincerely,

      jim

    • 6

      ciderfeks said:
      January 9th, 2014 at 8:28am #

      Hi Pete, thanks for the schematics – I’ve been working through the bends you’ve posted here and a few others I’ve found along the way – this is going to be a nice piece I hope. I have not been able to figure out the FX patching yet though – is there any chance you could shed any more light on that? I’ve cut the trace where indicated and tried “joining the dots” of the two unlabelled connections shown on your schematic, (orange on the left, blue on the bottom right) but so far nothing… Any advice would be great.
      Also, as a heads up for others – I thought I had fried my one for a while, but it turns out I had blown the resistor in clear plastic casing next to where -v comes in to the board (top left on your schematic). It seems this resistor might be easy to blow – replacing (or bypassing) it restored life to my ‘phone. Thought maybe others might find this helpful.

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