Cell phones in developed countries use many frequency bands. It takes a number of complicated circuits to detect each band.
How many and which frequency bands are used in your country?
What is the max distance you want to detect a cell phone that is transmitting?
Will the cell phone be transmitting at max power because the signal is weak or at reduced power because the signal is stong?
helo.. plz can u tell me, if we want to inccrease the range of a cell phone detector circuit.. in which transistors are used... how can we increase the range... and should we change the wire antenna too?n should we change the capacitor value or wht.. plz reply me soon waiting for ur reply
helo.. plz can u tell me, if we want to inccrease the range of a cell phone detector circuit.. in which transistors are used... how can we increase the range... and should we change the wire antenna too?n should we change the capacitor value or wht.. plz reply me soon waiting for ur reply
helo.. plz can u tell me, if we want to inccrease the range of a cell phone detector circuit.. in which transistors are used... how can we increase the range...
But this lousy circuit uses an opamp (not transistors) that has its inputs overloaded by the strong signal from a nearby cell phone and it does not have a radio circuit.
You might be able to add an RF amplifier circuit to its input but it must be a wideband microwave amplifier.