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
Thu Jan 11 2018, 01:23 AM
Hi Dave. Good to see you. Parole ?
DavesGarage
Tue Jan 09 2018, 07:55 PM
It's been a few years since I poked around here - Hi all...
ExperimenterUK
Mon Jan 08 2018, 07:19 PM
Hi TPS. it's been a while..
۞ TPS ۞
Sun Jan 07 2018, 06:42 PM
hello
Thu Jan 04 2018, 01:50 PM
sayyad affrid
its AT89S52
Thu Jan 04 2018, 01:50 PM
sayyad affrid
sir, i want embedded c code for ultrasonic sensor having buzzer interfaced with AT9S52
Mon Dec 18 2017, 08:12 PM
zafir
i am making digital voltmeter using AT89C51, ADC and LCD 16x2,,, kindly someone please send me hex file in assembly language
Fri Dec 15 2017, 12:18 PM
mehari
can not find dhtxx.md file in proteus 8.0 can anybody help me please?
sahar7478
Fri Dec 08 2017, 12:47 PM
can i get gsm a6 library? can anybody help? tia
Faiqa
Sat Nov 25 2017, 08:32 AM
Can i get the code of Monitering and controlling of green house effect? ... Can anyone help me ?

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eddieprice
Fri Jan 12 2018, 04:07 PM
bastik
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ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Jan 13 2018, 10:26 PM
This is clearly an old design.A modern microcontr...
bastik Avatar
Posted By bastik
Sat Jan 13 2018, 09:38 PM
For now I don’t have much information about device...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 06:49 PM
Sometimes the Configuration word has to be program...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 06:30 PM
What exactly is your situation ?I very much doubt ...
eddieprice Avatar
Posted By eddieprice
Fri Jan 12 2018, 04:32 PM
I am using a 16F84A for the first time and am havi...
bastik Avatar
Posted By bastik
Fri Jan 12 2018, 10:37 AM
I have device with SAB80C535 microcontroller and I...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 12:01 AM
I tried to compile your 8051 version in Keil 5but...
cjj20 Avatar
Posted By cjj20
Tue Jan 09 2018, 07:42 PM
I just think something is off in the checkgpgga fu...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jan 09 2018, 07:35 PM
Why do you think there is something wrong with it...
cjj20 Avatar
Posted By cjj20
Tue Jan 09 2018, 07:32 PM
Please help me correct this code #include ...