This 2KM FM Transmitter works on low voltage thus, all of its associated components will do too.
![radio and receiver circuit physics 101 radio and receiver circuit physics 101](https://images-na.ssl-images-amazon.com/images/I/51R-0VgmdrL._SX382_BO1,204,203,200_.jpg)
If you are an absolute beginner, skip this project, get familiar with transistors in simpler applications, then return an build this amazing circuit. I’d like to thank Seetharaman for his nice circuit, it works fine and it’s easy for people who built multiple circuits before this (like myself). Note that this isn’t the transmitting power but the power that is needed to operate, transmitting power depends on the type of antenna (please refer to the literature on RF electronics for the complete details)īecause Q3 (a good old metal case 2N2219 tor) gets bloody hot, I just bought myself a 4 cm fan which is to be installed after my schoolday. I measured the amount of needed curent and it turned out to be 115 mA, with a lab powersupply of 13.8 V, therefore I rate the power P=13.8*0.115=1.6 W. But thankfully it performs below the stated 2 km in my assembly.
![radio and receiver circuit physics 101 radio and receiver circuit physics 101](http://media.guitarcenter.com/is/image/MMGS7/000000113339885-00-1000x1000.jpg)
I didn’t dare to power this circuit up because of the relatively big transmitting distance (I don’t want law enforcement on my doorstep because I try to learn how radio works:P).
Radio and receiver circuit physics 101 how to#
For the RF choke I used a choke inductor of 220 uH, I don’t know how to call it officialy, but it looks like an electrolytic capacitor with radial wiring (leads out of the bottom).įor antenna I used a car whip antanna of approximately 1 m (app. So I assembled it on a piece of general purpose PCB, and it performed just better. Dear Seetharaman, I built this circuit first on a breadboard for testing and it just worked fine.