This project is to show the efficiency of ASM aka assembly language to control SI5351. The Source code can be found at the bottom. Yaali / Yali : The meaning is a mythical creature seen in many South Indian sculptures. It may be portrayed as part lion, part elephant and part horse. Source: wikipedia SOURCE CODE: /*     V U 3 X V R     Si5351 Clock Generator using ATtiny13     Programmed By : Ram Sankar Pillai     Date : 25-June-2018     Version : 1.0     Microcontroller Clock Speed = 1.2MHz using internal oscillator 9.6MHz/8 = 1.2MHz     8bit Timer0 overflow interrupt set to o ..read more

All design ideas from the EMRFD book. Thanks to W7ZOI, KK7B, W7PUA. And i'm blessed to get this book in India at a second hand book seller. I told him to reserve any radio related books, one fine eve he called me about this book. I also bought ARRL 2011 book. If i'm not using the design concept from this book, then its a shame on having the book. So, here is my QRP Project.. 1st design requirement is, front facing 4" speaker. No compromise. I wanted this to be a self powered, no need to search for DC adapter. The transformer salvaged from old HI-FI cassette player. 15V 2A. I used 12V regulate ..read more

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IntroductionThis is my project to demonstrate the simplicity of assembly language program. Usually we need lot of program size when we use Arduino compilers and its library. I'm much worried about the program size and coding efficiency. So i wanted to try my skill to make assembly language code to interface Si5351 DDS. After the introduction of mobile phones we lost our memory capacity to store the phone numbers in our brain. Similarly Arduino is spoiling our programming skills. It of-course opened up the creativity on hardware side, but on the software side most of the peoples copy-paste. The ..read more

This is a demonstration on Software Defined Radio Using Si5351 DDS VFO. Original designer is Burkard Kainka, Author of Elektor  SDR-2007. I Just modified VFO by using my own Si5351 based VFO, For more details please chek my blog vu3xvr dot blogspot dot in Specification :Frequency Range : 3 to 30 MHz Mode  : AM - SSB - CW - DRM Hardware Used :  https://www.elektormagazine.de/magazine/elektor-201607/29066 Software Used : SDRadio by I2PHD available from this website http://digilander.libero.it/i2phd/sdradio ..read more

Washing Machine Controller Using  AVR ATMEL ATmega8 Microcontroller Using Assembly Language (NOT Arduino)A brief history about why I decided to make my own controller :- I have a washing machine, with control board problems. I did changed the control board from OEM 2 times, each time it cost Rs.3900 + 300 for service charges. So, I spent Rs.8200/- since 2008. Actual machine cost is Rs.12,000/- Now in year 2016 the same control board SMPS failure . The washing machine model is Whirlpool Splash 55. Seems the designer of the board is a beer addict during design ! Very sad that not only for me for ..read more

DRM AIR +6100 KHz Shortwave receiving Magnetic loop antenna for 80m to 20m bandThis is my trial during year 2015 to receive All India Radio DRM signal from Delhi, India. I'm located south India which is 3600Km far. The actual DRM on 6100KHz is transmit to cover 80Km surrounding Delhi. I made a simple Magnetic loop to get signal from that far. It was a huge seccess. Since i'm using magnetic loop the noise level was very low, and i can null alomost to zero. Below you can find the pictures of my AIR DRM 6100KHz. I used old Oats container filled with sand on it as a post support. 3/4" PVC pipe, in ..read more

After the success of my receiving magnetic loop, i wanted to give a try on transmitting loop. It has both good and bad results. One fine evening my friend OM Prem VU2RPC and myself started fabricating the magnetic loop to transmit on 40meter. Used 3/4" copper tube used for air conditioner with a length of 9 feet. Wide spaced variable capacitor 30-300pF salvaged from old valve transmitter 2.5SQm wire for inner loop. Construction is as simple as possible. Just used 3/4" PVC pipes. Just maintained the outer loop dia as 3feet, and inner loop 0.5feet. We had about 10 contacts within 15 mins, it ..read more

Click here for the video demo of sending CW using BITX (real carrier !!! not modified tone ..read more