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
Sat Sep 29 2018, 06:28 PM
Please post questions in the forum.
Sat Sep 29 2018, 11:26 AM
Ashfaq Ch
hi i have some AT89C51RC microcontrollers already programed. some one help us to how to download from AT89C51RC and after study and edit all corractions reload to AT89C51RC controller
shshistiem
Wed Sep 12 2018, 10:58 PM
hii!! some1 please let me know how i ll get rfid code to 8051 by WEIGAND mode
DrNossberg
Tue Sep 11 2018, 08:09 PM
is there anyone here?
Mon Aug 27 2018, 07:30 AM
bun
Hello everyone´╝ü
Sat Jul 21 2018, 06:21 AM
Dibakar Bhanja Chowdhury
By using a 555 timer how can I expand the range of the mobile phone jammer? Please reply me asap
Sun May 20 2018, 10:01 AM
justinb
how to write and execute a program that read the keypad button and display the number on 7 segment on intel8051 at89s52 in assembly language?
Thu May 17 2018, 06:36 AM
HAMZA TAJ
sir iwant to ask about controller of three phase supply by using back to back thyristor instead of triac....will u give me some guideline?
Sat Apr 28 2018, 12:54 PM
ashutosh jain
IR Remote Switch using TV remote (RC5 Protocol) is not working properly. opp1 & opp2 is in problem.plz help
ExperimenterUK
Fri Apr 27 2018, 08:09 PM
@kaiserslautern Post in forum

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PCBindex
Fri Sep 14 2018, 02:45 AM
sirkit
Thu Sep 13 2018, 04:46 AM
shshistiem
Wed Sep 12 2018, 10:36 PM
DrNossberg
Tue Sep 11 2018, 03:25 PM
ranjanvh
Thu Sep 06 2018, 02:28 PM
rbbhamre
Tue Sep 04 2018, 06:15 PM
Tressie
Sun Sep 02 2018, 02:20 PM
Sudhansudeep
Fri Aug 31 2018, 08:26 AM

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ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Sep 13 2018, 08:39 PM
First of all, by reading your reply, I abandoned m...
DrNossberg Avatar
Posted By DrNossberg
Thu Sep 13 2018, 03:49 PM
Hi, thanks you for your reply ^^ First of all, by ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Sep 12 2018, 12:12 AM
HiThere are several issues here.The original 8051 ...
DrNossberg Avatar
Posted By DrNossberg
Tue Sep 11 2018, 08:08 PM
Hello everybody!First of all let me explain some s...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Sep 07 2018, 05:08 AM
The compiler thinks the micro doesn't have enough...
Sudhansudeep Avatar
Posted By Sudhansudeep
Fri Sep 07 2018, 02:59 AM
this is the build output message
Sudhansudeep Avatar
Posted By Sudhansudeep
Fri Sep 07 2018, 01:38 AM
Change the mobile number as [number removed] in t...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Sep 06 2018, 08:56 PM
I don't know what the problem is, I get no errors....
Sudhansudeep Avatar
Posted By Sudhansudeep
Thu Sep 06 2018, 01:12 PM
the code is Attachment ...
Sudhansudeep Avatar
Posted By Sudhansudeep
Thu Sep 06 2018, 12:48 PM
the code is same as u sent me for 16 chars