Actions
Forum Thread Details
  • State Verified Answer
  • Replies 6 replies
  • Answers 2 answers
  • Subscribers 279 subscribers
  • Views 894 views
  • Users 0 members are here
Related
See a helpful answer?

Be sure to click 'more' and select 'suggest as answer'!

If you're the thread creator, be sure to click 'more' then 'Verify as Answer'!

Another question about Experiment 11 in Make: Electronics (2nd edition)

os·cil·la·tor

Thank you for all the previous help with Experiment 11 in Make: Electronics.

 

I have now tried the final part of the breadboard circuit, but again I get no sound, although the light does blink as it did in the first part of Experiment 11. 

 

I have attached the relevant photos and diagrams.  The only unusual thing is that the connector wire near the 30 above the negative lead of the speaker is drawn in Figure 2-120 as perfectly horizontal, which would put it in a gap of the negative bus.  I tried angling it both up and down, but still no sound.

 

Does anyone see any obvious errors or have any suggestions as to what might be wrong?  I feel that perhaps the power is not making it down to the lower part of the circuit, but I'm not sure where I've gone wrong.  I would appreciate any insight!

 

image

image

image

image

  • 0

    Hi,

     

    Yes the 100K Brown Black Yellow is plugged into the collector of the transistor when it should go to the center Base pin.

     

    John

  • 0

    Also, the black lead of the speaker doesn't connect to anything. The '-' rail is split into two sections (where the gap in the blue marking is). Either put in a link across that gap to join the two blue segments together, so that the battery '-' can get all the way down the board, or move the speaker's black wire so it connects somewhere on the top section.

  • 0 in reply to jc2048

    Hi Jon,

     

    Good catch on the rail disconnect. I have automatically jumpered all my breadboards of this style as I have overlooked this problem a couple of times. It is easier to see that they are jumpered and unjumper if needed than it is to notice that they are separated unlike most of my breadboards.

     

    John

  • 0

    I wanted to mention that it is very good that you provide adequate information and pictures with your questions. So many people ask questions without providing documentation. It is a pleasure to deal with someone who realizes that we can't see the book or the project without good pictures, explanations, and documentation.

     

    John

  • 0 in reply to jc2048

    Thank you Jon, that did the trick!  You can see in the video below that I simply moved the black lead up a bit.  The kit speaker is dreadfully quiet, so you may have to turn up the volume to hear the oscillations.  I experimented with different capacitor values to change the speed, as suggested in the experiment.   On to the next chapter!

     

     

    image

  • 0 in reply to jw0752

    Hi John, thanks for catching the resistor error!  I don't know how many times I looked that over.  And glad the visual aids are helpful. I figured that would be the easiest way to communicate the issue.  I really appreciate the help!