My hobby is electronics and I am an IT professional working for Siemens. Just now I saw your project on: "Simple RF Receiver And Transmitter @ 27 MHz" and the clear explanation there made me speech less. In fact I was looking for something neat and clear as yours here for quite sometime. Thank you very much for all the effort you have made.
Now, let me explain my objective for searching such a neat and clear project on RF receiver. I wish to make a wireless doorbell myself with a range of about 50 meters just like the Chinese made wireless doorbells (please refer to the below URL):
http://yume-deals.blogspot.in/2012/10/t ... -just.html
Now, while surfing the internet for this, I came across another website: (http://www.talkingelectronics.com/te_in ... index.html) that explains how to build one such with an operating frequency of about 303 MHz and which will use an in-built antenna. I was successful in making the transmitter part but could not make the receiver part. I had also purchased a ready made Chinese doorbell and could tune my home made transmitter unit with it nicely.
Looking at your 27 MHz project, I would request you to present another project which will help your readers to make a 303 MHz Wireless Doorbell easily at home with a range of about 50 meters with a built-in antenna. Last but not the least, the beauty of the Chinese doorbell is that the receiver unit runs from just 3 volts battery and consumes 6 micro ampere current when idle!!
Though electronics is my hobby but I could not afford an oscilloscope to my workbench as yet

GY 560. Please also let me know if this will help me to test the receiver circuit.
Waiting eagerly for your response.
Thank you again for the wonderful project and your time to read this long e-mail of mine.
Kind regards,
Raj Kumar Mukherji