Help on what parts ill need

Discussion in 'The Projects Forum' started by CoreySelby, Mar 22, 2015.

  1. CoreySelby

    Thread Starter New Member

    Mar 21, 2015
    Okay so I want to basically build a tiny drum set with buttons. A classic drum set with 7 buttons that each play a different decent short sound.

    Would i be able to make it without a micro controller? if I can, what SMALL parts would i need and how?

    Basically I just need a list of the smallest possible parts to make this happen.

  2. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    How can you (or anyone else) create a parts list without a design?

    ........ do you see the problem here?
    Last edited: Mar 22, 2015
  3. MrChips


    Oct 2, 2009
    SgtWookie, absf and Netwaves like this.
  4. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    The November 1983 issue of Electronics Today International (ETI) magazine published a "Mini Drum Synth" based around the 555/556 timer . The beat was triggered by tapping a small loudspeaker and would decay in amplitude (just like a normal drum) but also had the option to fall in frequency to give that "classic" 80s syn-drum sound. I can't find the schematic anywhere on-line but someone may still have a copy; it shouldn't be too difficult to reproduce something similar.
    Last edited: Mar 23, 2015
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
  6. MrChips


    Oct 2, 2009
    I have built that Drummer Boy and might still have the PE magazine.
    I will post some photos later.
  7. absf

    Senior Member

    Dec 29, 2010
    Was it similar to this one?

    This one uses a speaker as the input device. And I think mc14046 is a PLL chip.

    The description is in this link here

    There is another one that I found was quite interesting too...
    It's call drum simulator for music synthesizer...

  8. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    It was actually much simpler.

    I am fairly certain that the only active components were a 556 dual timer and a transistor or two, but no more.

    I believe that timer 1 was configured as a monostable and provided two outputs; an enable pulse and a rising (sawtooth) voltage taken from the capacitor and buffered by an emitter-follower. Timer 2 was configured as an astable and was tuned to whatever frequency the drum required.

    A pulse at the input triggered timer 1 which then enabled timer 2 (which would produce a tone) and the sawtooth output was then used to modulate the amplitude of timer 2 and, if selected, the frequency.

    This would be a very nice beginner's project because it was very simple and with just a few drum modules and a simple sequencer built from a couple of 4017 decade counters, it's possible to build a complete programmable drum machine.

    I will check in the loft, I may still have the magazine.....