How to Make Paper Transistor




List of material need

1. Paper (any book are note paper )  
2. Pencil  (any one )
3. LED  (20 mA  small LED)
4. Wire single strand
5. Sticking tape
6. Battery (6 volt 4.5ah or 12 volt 7ah for best result )


Step 1: Step 2

Step; 2
By using an pencil draw a transistor shape on paper you have (note: make it as small as possible and mean time big enough to wire to be pleased on it )


Step 2: Step

draw a outer line using pencil

Step 3: Step 3

Step 3
By using your pencil try to fill the space with multiple layer of pencil cote many as you can until you get reflection on paper (note : use blunt tip other vise paper may damage )

Step 4:

Step 4
Above image shows that (E, B, C) emitter base collector by using the sticking tape please a negative terminal from a battery to an emitter terminal of  paper transistor at bottom side

Step 5:

Step 5
Taka a LED and please a cathode at collector terminal stick with tape (make sure it properly touching the paper) and anode terminal of an LED to an positive end of a battery (NOTE: by this time LED will glow other vise check the connection

Step 6:

Step 6
And using a single strand wire make another positive terminal extension and please on the base terminal of an paper transistor (note : do not stick it )
By this base supply the LED will turn off (NOTE: because  the negative supply traveling trough the emitter to collector terminal is intercepted so at the base terminal the positive potential is equal or greater than the negative potential  (  + =>  -   )   so the LED turns off  )



    • Arduino Contest 2019

      Arduino Contest 2019
    • Tape Contest

      Tape Contest
    • Trash to Treasure

      Trash to Treasure

    16 Discussions


    8 months ago on Step 6

    Not a transistor, just a resistor. The "base" is just a tap on the resistor, connected to V+ just shorts the LED out. If you put a current meter on this, you'll find more current flows when the LED is off.


    2 years ago

    You are right ... it is a "sistor" ... but with a "re" not a "tran."


    3 years ago

    haha lol what you think you can fool us.... you make a graphite circuit and make short circiut to show the led shops.. nice bro lmao


    3 years ago

    Is that a pnp transistor or a npn transistor.If no answer then its not a transistor ha ha ha.


    After looking at step 5's image and analysing the wiring I discovered that it is not a transistor. A transistor would light the LED up when you touch the wire in it's base, not turn it off. Basicly what you do is to create a short between the + and the - when you touch the wire, bypassing the LED (electricity takes the least resistance path, in this case the wire, and when the wire is not connected the LED) and turning it off.

    1 reply

    you're right that it's not a transistor, but what you're talking about (A transistor would light the LED up when you touch the wire in it's base) is what would happen if it was a npn transistor, there are other transistors that do the same thing as this paper, it just works in a different way.

    That's not how a transistor works, a transistor (assuming the commong bipolar transistor) operates as a semiconductor with at least one each of p and n-type semiconducting material. This doesn't transfer resistance or change the resistance of the third terminal, it simply draws power through the shortest available route, far from what a transistor does.


    5 years ago

    nope it is not an transistor


    5 years ago on Introduction

    Ah. Actually no this isn't a transistor. The graphite in the pencil lead conducts electricity.

    A transistor would require a PNP or an NPN junction to operate.

    What is happening here is that the positive connection to the "base" short circuits the LED so all the current is flowing through the wires rather then the LED.

    1 reply