Welcome to the NE555 club

Discussion in 'General Electronics Chat' started by takao21203, Aug 7, 2014.

  1. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
    I have ordered some of these for reselling, as they are popular.

    And most of them are already sold off.

    So a few weeks ago I ordered a large box of NE555 DIY kits too, arrived yesterday.

    Had to assemble one of course. It makes noises! I used a small SMD 8 Ohms speaker which heats up and draws too much current from a 9v battery, so I tried inlining two 1500uH coils. Still heating up but not that much.

    If I hold the coils together, I can hear interference!

    Bought some 4017 DIY kits and they all have sold, reordered more of course. And selling them together with better LEDs.

    Together with the small Audio transformers which also arrived yesterday, I could offer a MAG AMP experimentation kit- just I think it's a lost art somehow.

    Of course also include small bulbs, diodes and so on, some wire potentiometers...
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    Nice, but mine tastes better:
    lm555 cookie.jpg

    Sorry, only crumbs are left. :D

    Good luck.

    Last edited: Aug 7, 2014
    THE_RB, KJ6EAD, ScottWang and 2 others like this.
  3. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
    At some operation point secondary oscillations (low frequency) are produced, when using a small speaker + 3000uH inductor.
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    The tall glass of liquid white stuff is missing from that picture.
  5. ScottWang


    Aug 23, 2012
    Ha ha, It's funny ... :)
    How was the LED made of?
    Can I show your picture to other forum?