Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Please Explain this RF Circuit

Status
Not open for further replies.

faisal_m786

Newbie level 5
Joined
Feb 22, 2009
Messages
10
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,339
I have worked on different type of cell phone jammers but all have VCOs which produce a disturbing signal I found this very different circuit on the internet please have a look

**broken link removed**

but no specific details are given, can anybody explain how this works

Thanks
Faisal
 

Tralfaz

Newbie level 6
Joined
Jan 29, 2005
Messages
13
Helped
4
Reputation
8
Reaction score
0
Trophy points
1,281
Location
Illinois, USA
Activity points
91
Without building and testing, it appears that the 555 switches the base of Q1 with a "ping". The ping in turn causes a ringing in the output tank, much as would occur in a frequency tripler used in a PLL. It looks effective though very low power.
 

vfone

Advanced Member level 5
Joined
Oct 10, 2001
Messages
5,498
Helped
1,588
Reputation
3,181
Reaction score
1,197
Trophy points
1,393
Activity points
34,912
Seems that you got a full-time job building cell phone jammers.

The one presented in the above link is for old analog cellular systems as AMPS or NMT. The digital systems as 2G, 2.5G, 3G or 4G, are probably immune to something like this.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top