Instructables

How to Make a Metronome

Hi everyone, this is my first instructable. I hope you enjoy it!

In this instructable I will show you how to easily make an electronic metronome, at the heart of which is a 555 timer. I found the original plans for this and the circuit diagram here.

Here is a video of the metronome.


It has two LEDs and a speaker. For each beat, it clicks and switches the LED that is lit up. You control the speed of the beats with a dial.
 
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Step 1: Parts and Tools

There are a few parts and tools you'll need you'll need. I found all of the parts at Radioshack, and I bet that all of the tools can be found there too. Links are to the parts and tools at RadioShack.com.

Parts:
9v battery snap-on connector
9v battery
2 (two) 22 uF capacitors
3 (three) 1K ohm resistors
Perforated PC board
555 timer
Wire
SPST Switch
2 (two) 3V LEDs
8 Ohm Speaker (see notes below)
250K Ohm Potentiometer (see notes below)
Knob
And finally... a project box.

Notes:
A project box can be just about anything that the parts will fit into, will sufficiently protect what you've built, and have some way of providing access to the controls. I used a see-through plastic box that held thumbtacks. It conveniently opens and closes for repairs and battery changes, makes it look cool, and you can easily drill holes for the controls to go through. You could buy a project box from Radioshack or find one in your house.
About the speaker: I found mine in a bad set of walky-talkies. To find out the resistance, just take a multimeter and measure the resistance across the leads or it should say on the package if you bought it. It needs to be 8 ohms!
About the potentiometer: If you click on the link, it won't take you to a 250K ohm potentiometer. That's because Radioshack doesn't have one. Instead, I found a stereo 100K pot at Radioshack and the two signal paths in sequence so it became a 200K pot (which is close enough). The diagram for this is in the next step.

Tools:
Drill (if you want/need to drill holes in your project box for the controls/leds/speaker)
Soldering iron
Glue/adhesive to hold stuff in place in the project box (I used a hot glue gun, it's easy to use and holds things well)
Breadboard (if you want to make a prototype, which you should)
jacobr88932 years ago
I've made it, but yours and the one i have made both have this sort of strange pseudo-swing in the tempo. Is there any way to get rid of that? It would be more accurate.
aevans-lo3 years ago
if i only have a 100 uf capacitor, how can i make it work?
not possible
gbear_013 years ago
I have followed this instructable, but I am using a SE555 timer I got from DigiKey. The volume coming out of my metronome is so low it is basically unusable for a musical aid. Any ideas to boost the volume?
Higher voltage, or instead of a speaker, add a female 3.5 MM port, and connect that to speakers
sjoobbani3 years ago
What about a 500K ohm knob thing? and do I really need a speaker? I mean... could I connect it to a relay (that isn't connected to anything else) so it just makes the noise? I need a reply quick! I'm trying to go get the stuff real soon!
any potentiometer that has a higher resistance than the one specified will do, it will just "drop out" much sooner in its rotation.
oliboy_484 years ago
what if i want to connect an earphone output...how and where will i place it?..i'm planning on using it for my drum playing...thanks..
Do you mean instead of the speaker? If so just get a stereo/mono jack and solder it in place of the speaker.
TSC4 years ago
Sweet, I wish I could build  this!!!!!!!!!
Well done mate :)
Ey can the potentiometar have 3 ends not 6? i mean will it work?
bananafred (author)  stexmetalac074 years ago
 Yeah it will work fine as long is it is the right resistance.
raykholo5 years ago
this can be made a lot cheaper -- simply with a relay and the potentiometer , which i understand to be an adjustable resistor... wire the battery to the relay so that it switches between the 2 contacts and use the potentiometer to control how fast or slow.. and use leds as used here..
Incorrect. You would have to use at least two relays, and you could not control the speed.
true, 2 relays are needed
however, by adding a a capacitor across the power leads of the relay it is possible to broadly control the speed at which the contacts switch.
there are also other ways... which are not as easy to describe but basically involve capacitors in parallel, and a relay that switches them from charging to actuating a second relay... yeah its not that easy to describe but i have seen it happen before and the potentiometer would control their interval of charging... in this scenario...
Capacitors! I did not think of them. And I think were thinking the same thing - the two relays oscillating off each other. Capacitors... I should have thought of that.
 yep.... sounds about right.  
make life easier by simplifying the idea
now i have a lot more experience with electronics then when i first commented above so a 555 now is no problem at all and relays are inefficient, not exact, and consume lots more power than a single 555 IC.   Just saying that relays can be wired to actuate a buzzer/led at regular intervals but so can the 555.  also check out the annoy a tron ible as it performs a similar function...
I'd rather use an arduino than a 555... but that's because I don't have any 555's on hand.
 so would anyone else....   Any microcontroller really with a crystal will be sufficient and a lot more exact as some of my work with the 555 has rendered results + 20 seconds off.  arduino already has the crystal as part of its development board and makes that part of the programming even easier.   As far as I am concerned, 555s are too unstable and theres too much leeway for error, but most wiring mistakes within a microcontrolled circuit can be fixed within the code, just by swapping the pins... or stuff like that...
I use 555s, when available and appropiate, because they cost .08 apiece. The cheapest Arduino I have ever seen was about 10 dollars. Of course, I would never use a 555 for anything timing essential; but, per se, on a "flickering" light, I would defiantly not have it at more than a few dollars expenditure.
trapman165 years ago
This a awesome and fun project to make. thanks!
stevenjones5 years ago
Awesome man! Wish I knew about this back in the day, it would have been really cool for an electronics projects. That's if we had them back then :(
Why not use this site to test the accuracy of your metronome.
http://www.play-bass.com/metronome.html
carlos-felo5 years ago
It's great! Thanks.
a.mandolin95 years ago
How much money would it cost to get all of this stuff?
It depends what you have lying around. Probably about $5.00 if you have LEDs, speaker, and PC Board... DYLEGO
FaqMan5 years ago
Pretty cool I have to try this.
mutface5 years ago
Great Job, I just finished this and it's awesome!
bananafred (author)  mutface5 years ago
Thanks! Any pictures?
Kiteman6 years ago
I like this - I've added it to my I really ought to make one of these as a Christmas present for... list.

Small niggle, if you want people to follow your photo of the breadboard, then you need a much clearer shot of the breadboard, preferably in macro, from directly above, with the board filling the whole image.
bananafred (author)  Kiteman6 years ago
Unfortunately I don't have the breadboarded circuit any more and my camera can't do very good macro pictures, but I added my best shot of the breadboard to the prototype step! Thanks!
bumpus6 years ago
Awesome! This is pretty sweet.. 4/5 stars!
BrianKT6 years ago
Pretty cool! Great project for aspiring musicians! Will definitely try this out!
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