I am doing a engineering project basis on jammer.. I need a adjustable range cell phone jammer circuit..?

Cell phone jammer

The wave bubble project has a lot of schematics and ideas:

http://www.ladyada.net/make/wavebubble/

Not sure about adjustable range, but I'm sure you could disturb/limit the transmission power if need be. Ask a HAM geek if you're not one yourself. Keep in mind that cell jammers are illegal in tons of places, in many even to possess the device without using it.
eirlandes6 years ago
or just buy a yapper zapper. google it.

phone jammer