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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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
Wed Apr 25 2018, 07:09 AM
kaiserslautern
Hello everyone, using software uart is a very good idea for a second serial port. Thank you so much. I would kindly like to know how to connect this port to the PC?
ExperimenterUK
Sat Apr 21 2018, 07:50 PM
This is a community site. Feel free to help anyone needing advice
hareeshchamiyar
Thu Mar 29 2018, 10:47 AM
please help me for the configuration bits for dspic30f2010
hareeshchamiyar
Thu Mar 29 2018, 10:45 AM
can any one using dspic30f2010.
Thu Mar 29 2018, 06:03 AM
Neena
can anybody give solar tracking in 8051 using proteus and keil to mail [email protected]
ExperimenterUK
Mon Mar 19 2018, 07:33 PM
sorry bedo.. maybe next time

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bdmehta
Tue May 22 2018, 02:30 AM
kmag1953
Sun Apr 29 2018, 07:09 PM
udiwonder
Sat Apr 28 2018, 12:41 PM
pirpiri
Sat Apr 21 2018, 03:35 PM
Pater
Fri Apr 20 2018, 02:38 PM
jamiel
Sat Apr 14 2018, 12:47 AM
akrepkral76
Wed Apr 04 2018, 07:51 PM
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Mon Apr 02 2018, 06:27 AM

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ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Jun 21 2018, 10:49 PM
The frequency of the pulses has to be the same as ...
LAMBO Avatar
Posted By LAMBO
Thu Jun 21 2018, 02:13 PM
hi sircan we change the frequency on pin no 39 of ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Jun 16 2018, 11:33 PM
hi sir sorry for the late reply sir can we control...
LAMBO Avatar
Posted By LAMBO
Sat Jun 16 2018, 07:15 AM
hi sir sorry for the late reply sir can we control...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon May 14 2018, 10:17 PM
So the main problem is that I am not getting Analo...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon May 14 2018, 09:40 PM
Hi sir after checking all the connection i...
Pater Avatar
Posted By Pater
Mon May 14 2018, 05:36 PM
Basically my project is based on Data Acquisition ...
LAMBO Avatar
Posted By LAMBO
Sun May 13 2018, 02:13 PM
Hi sir after checking all the connection i...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon May 07 2018, 07:27 PM
This design should be fine.Choose a frequency betw...
Pater Avatar
Posted By Pater
Mon May 07 2018, 01:28 PM
Sorry for late reply as exams were on,Based on my ...