100-in-1 Electronic Project Kit

When I was in the 3rd grade, my friend Paul had one of these. His mom used to watch us after school. We played for hours on this thing making radios, tweeting birds, and blinking lights. I asked my parents to get me one for Christmas 3 years in a row. Eventually my dad came through with a 150-in-1 in 6th grade. I ran across this one and couldn't resist getting it. The kit was complete save the original earphone and a few wires. Some of the wires had come loose on the back and some had corroded through due to it being kept in a damp area. It's all working now. The first thing I built was a 3 transistor radio. The power amplifier transistor was overheating, so the sound faded off after a while, but it did work. Bubbles asked me if the radio was playing stations being broadcast today or from when I was a kid.


  • Rob Cruickshank PRO 8y

    That takes me back! I had exactly that one! I'm still building twittery bird sounding things, too, 30 years later!
  • Wesley Barnes 6y

  • Willie... 5y

    You could have changed the bias resistor on the base of the output transistor to a higher value... that should have solved your overheating problem. :) Man, I remember having one of these, also! I literally wore the things out, I used them so much!
  • BlazerMan 5y

    Replacing the output transistor fixed the problem. I actually found 70's vintage 2SB56 transistors with a web search. I also found replacement earphones for all my re-aquired kits. Now if I could just find some of those red globe bulbs.
  • Rob Cruickshank PRO 5y

    BlazerMan At craft stores you can sometimes buy paints made for imitation stained glass- I've used these to colour bulbs before. You should be able to make a reasonable approximation, anyway!
  • BlazerMan 5y

    Great idea Bob! I'll keep an eye out for the paint.
  • TonyTheTutor 4y

    I learned so much playing with my 100-in-1 kit. I combined the light sensing circuit (reversing the relay from NO to NC), the fire engine siren, and a flashlight to make an alarm beam, then set it up in my darkened bedroom. I called my cat, and when he came in, his tail broke the beam, set off the alarm, and made him run out at 100 mph! 8-)
  • a_m_dyer 3y

    I had one of these as well, still doing electronics 30 years later. Thanks for posting.
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Uploaded on September 24, 2007
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