audioguru Posted May 11, 2006 Report Share Posted May 11, 2006 me asking for the calculations of the indutor indectance and the capacitor attach to it The inductance and capacitance values are far too high to be resonant at the very high RF frequencies used by cell phones. You don't want resonance anyway because cell phones use a very wide range of RF frequencies.I think:The capacitor just blocks DC so the base of the transistor is at the proper voltage.The inductor is just a folded-up antenna. Quote Link to comment Share on other sites More sharing options...
arsal_uet Posted May 14, 2006 Author Report Share Posted May 14, 2006 can u plz tel me what is the function of the capacitor c2 that is attached to the shorted pin 6 and 7 and then to ground. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 14, 2006 Report Share Posted May 14, 2006 can u plz tel me what is the function of the capacitor c2 that is attached to the shorted pin 6 and 7 and then to ground.The datasheet for the 555 tells you how its monostable works:When pin 2 is triggered by the transistor driving it to ground, the 555's pin 7 reset transistor no longer grounds pin 7 so R3 charges C2 until its voltage reaches the threshold voltage of pin 6. Quote Link to comment Share on other sites More sharing options...
arsal_uet Posted May 17, 2006 Author Report Share Posted May 17, 2006 thanks to all of the contributers to my project.me got A++ grade in the project.but i wold strongly recomend that before doing anything just read the monostable operation of the 7555 ic. all the questions wold be solved bc how this circuit works and how the 7555 and the inciming signals works will be clear. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 17, 2006 Report Share Posted May 17, 2006 Hi Arsal,You got a pretty good grade. Nice going. ;DI was glad to help you. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.