How to Make an Electronic Metronome

Step 3: Schematic

Lets take a look at our schematic before we start building it.
As you can see right away, the hearth of this project is the LM 555 timer chip.
( the 3rd drawing shows the functions of the 555 timer chip pins)

Our Connections are:
-Pin 1 of the chip is connected to pin 6 via the 22uF capacitor. Pin one is also the base ( 0 V supply)
-Pin 2 is connected to pin 6
-Pin 7 is connected to pin 6 via the 250K Potentiometer
-Pin 4 is connected to pin 8
-Pin 4 is also connected to pin 7 via the 1K Resistor
-The speaker is connected to pin 3 via the 22uF capacitor and to pin 1

Later in the Instructables we will go into details and trough all the remaining connections.

Now, lets start making our Metronome !
 

Comments

[suchit_mehrotra]

I made as above and it is pretty good.There is a bit of problem .That volume level of the beat is low and practicing it wit a guitar makes the low sound difficult to hear.

[noob_for_life]

This is great.  Clean.  Straightforward.  Accessible.  And I really like your explanations.

My son and I were thinking about making a metronome which would have his drum teacher's voice yelling "COUNT!"  This looks like a good start.  Would you (or someone) please suggest enhancements so we could add our own sounds?

Thanks!

[comodore]

Well, a few ideas come to my mind and the first is that you buy a voice record/playback circuit or pull it out of a toy... You basically use the metronome schematic as a switch that switches on the record/playback circuit. Here is an example of a toy that has a record/playback circuit... I bought a couple of these toys and they are pretty easy to hack and mode... http://www.getlofi.com/?p=1152 Good luck ! Please don,t hesitate to PM me and ask if you have any more questions or some suggestions! Thanks! :)

[rajsekhar291]

please tell me how this circuit works

[comodore]

Well, what in particular do you want?
It's all in the LM555 timer. The configuration of resistors and capacitors is what determens the frequency, the time between blink, the ON/OFF time...
Google IC 555 timer and learn more!

Feel free to ask anything more!