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Astable Multivibrator Circuit Parts List Page 2

Astable Multivibrator Parts List

On this page you should find everything that you need to build your flasher circuit and get it working. I've provided links to suppliers where you can order the parts you need.

The problem with buying inexpensive electronic components on line is that it can be difficult to get one or two items at an economical price due to the shipping costs so I have concentrated on looking for sets of components that provide good value instead.

You will likely end up with a lot of components that you do not need for this project alone but you will start to build up a stock of bits and pieces that you will find useful for your next projects. With the exception of the battery connector clip I built the circuit in the photographs entirely from my own scrap box full of bits and pieces.

Solderless BreadBoard
830 tie-points

An 830 point breadboard is more than big enough to accommodate our multivibrator circuit and will give you enough room to build more projects later.


R1, R2, R3, R4

No matter what projects you decide to build in the future you will need resistors. Having a handy stock of different value components on hand can prove very useful. This is especially true when you are experimenting with different values to tweak the timing in your multivibrator circuit for instance.


C1, C2

Capacitors are almost as common in electronic circuits as are resistors. No matter what projects you decide to build in the future you will need capacitors. Having a handy stock of different value electrolytic and other types of capacitors on hand can prove very useful when experimenting.


T1, T2

Transistors are very useful. You can use them to build all manner of circuits and you will often find you need one or two even when dealing with more advanced microcontroller projects.


D1, D2

Not only are they fun devices but you can use LEDs in most circuits for indicating state at various points. A well placed LED can give you an awful lot of information about what is happening in your circuit. Magic when things are not working exactly how you think they should.

Hookup wire

I have a reel of bare 21 AWG (22(SWG) solid copper wire which I tend to use for short hook ups. Insulated solid hook up wire will do the same job for you and allow you to use greater lengths without fear of touching the wire to other links or components and causing a short circuit. Just cut to length and strip the insulation from the ends.



You can generally buy a 9v battery from almost any store. I have included it into the parts list for completeness to allow you to order everything at the same time if you wish.

Battery connector

Cheap snap on battery connectors provide an easy way to connect and disconnect power from your circuit.

Wire Strippers/Cutters

A pair of wire cutters is about the only tool that you absolutely need to carry out this project. If you want to kit yourself out with a few more tools at the same time take a look at my essential electronics tool kit.

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Comments (5)

Topic: How To Build An Astable Multivibrator Circuit Without Solder
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Amalia (US) says...
Can anyone tell me how to place 2 toy DC motors on the breadboard so that they intermittently go on and off like the LEDs? Or is this not possible? I want to use it to power a toy that zig zags. I'm going to try it anyway tonight but I would like help on where to connect the motors on the breadboard since I am a novice. Thank you.
19th August 2019 8:10pm
Richard says...
An excellent little circuit! Thanks. I shall be using this for a dummy alarm. Any ideas how long the nine volt battery will last (i.e how much current does the circuit consume)?
6th August 2015 3:56pm
Steve (UK) says...
Hi Richard,

As it stands the circuit consumes about 15mA and if the battery is alkaline with a capacity of 625mAh then it should last approximately 30 - 40 hours.

You can try increasing the values of the two collector resistors R1 and R4. Common high efficiency LEDs will still glow brightly with only 1mA so try replacing the 470 ohm resistors with 4.7k ohm. This theoretically should allow the battery to last for up to 600 hours.

6th August 2015 11:34pm
James says...
Wow, super cool... my first brush with electronics! I am curious, how can you change the rate of flashing? Also, how would you apply this circuit to producing a audible noise (sine wave)? Again, thanks so much!
23rd November 2014 8:59pm
Steve (UK) says...
Hi James, I'm so pleased that I've interested you in electronics. You are where I was 50 years ago. The flashing rate is controlled by the two pairs of resistor/capacitor R2/C1 and R3/C2. Increase the values of the two capacitors to slow the flashing rate. Decrease the values to increase the flash rate. You cannot use this circuit to produce a sine wave but you can make it produce audible signals. Signals become audible at around 5Hz to 16KHz. If you decrease the capacitor values so ... Read More
23rd November 2014 11:46pm

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