Drawdio is project that allows you to Draw Audio, you can make any Audio Pattern by drawing it using Lead Pencil. This Project is very easy to built uses simple Electronics components, totally Electronics Based no controller is used this, quite interesting for a person like me who love to make things using pure Electronics mean without using any controller

The Heart of this project is a simple Oscillator which is made by very familiar NEC555 which is in fact replaced by TLC551 in this circuit because of its high input impedance, very low power consumption and High output current capability. 555 requires 5 volts to operate mean minimum 3 primary cells so we are using 551 which can operate at 1 volt so we need only one AAA cell to get its working at up to 2MHz frequency which is quite handy and interesting.



In above Schematic you can see two boxes on TOP that are named as "TOP BOT" you have to connect these physically with inner core of Lead Pencil see images below how to do this.


In above pic you can see author is using copper tape to make connection but i know here in Asia especially in our region i.e Indo-Pak we people use these things very rarely if you have copper tape then you can use it if you didn't then i have solution for you, get a box of cigarette, Tore it and get Flavor Protecting Foil Paper (Reflective type Metal usually Aluminum Foil ) fold this paper and make a strip like copper tape used in above image, now use thumb pin to connect it with pencil core as shown i below image.



Now make another strip of that foil and turn it around the pencil like this

Here is you Complete Design

See this video to get its working.


Click Here to get PCB Layout and Complete Detail
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ExperimenterUK
Mon Jan 07 2019, 09:01 AM
@REVOCATUS please post in the AVR forum
Mon Dec 24 2018, 02:55 PM
REVOCATUS MATEMU
sorry I mean referee boards for player substitution
Mon Dec 24 2018, 02:54 PM
REVOCATUS MATEMU
hi am.looking how to build referee by using Atmega 328 and its codes
Sat Dec 15 2018, 07:15 PM
Arslan ayoub
Hii ,, can I get the simulation of numeric keypad lock on proteus
ExperimenterUK
Mon Dec 03 2018, 10:47 PM
Please post questions in the forum. The chat box is for chat
Mon Dec 03 2018, 12:13 PM
help!me!
help! I don't understand busy flag!
Mon Dec 03 2018, 01:31 AM
ile
hello
Mon Nov 12 2018, 11:28 AM
Pavan_user
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
bgk3678
Tue Nov 06 2018, 08:06 PM
kindly any one give solution for my problem
ExperimenterUK
Tue Nov 06 2018, 03:18 AM
Pins high is the normal state. You need a program to set them low

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garfield0929
Sun Jan 20 2019, 12:48 AM
servprov
Thu Jan 17 2019, 06:44 AM
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Wed Jan 16 2019, 04:21 PM
sandhyashree
Wed Jan 16 2019, 04:04 PM
SONACHAI1234
Sun Jan 06 2019, 08:14 AM
manan.gulyaani
Tue Jan 01 2019, 07:58 AM
etech
Sun Dec 30 2018, 07:44 PM
NeilC
Sun Dec 23 2018, 07:39 PM

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Posted By ExperimenterUK
Sun Jan 06 2019, 10:37 PM
Which 8051 chip are you using ?
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Sun Jan 06 2019, 08:21 AM
Hi,By mistakenly i burn rx program in my 8051 micr...
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Nobody knows?sifirsekizThe problem is that you are...
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Guys pleaseeeee :((
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HiThe pulse-sensor-amped has an analogue output.Th...
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HiThe pulse-sensor-amped has an analogue output.Th...
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and ı have pulse sensor one out but anolog use 805...
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