FM modulator strong - weak signal switching circuit


Posted on Mar 28, 2007

It shows an FM modulator of a strong, weak signal switching circuit. The circuit ring 3-14 (a) shown in mechanical switches, one for the workers selector switch to choose based on the signal strength. Figure 3-14 (b) shows the use of diode switching control.


FM modulator strong - weak signal switching circuit
Click here to download the full size of the above Circuit.

Figure 3-14 (c) shows the use of an intermediate frequency amplifying circuit receives the signal level strength diode control. VT3 control diode bias, when forward biased channel antenna number directly into the resonant circuit, reverse bias to induction via the inductor to the resonant circuit, about 12 ~ 15 dB attenuation of the difference between the two. This is generally used to attenuate the switching circuit receiving a strong signal (local broadcast) and weak signal (the signal field) antenna input.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Ignition monitor strobe
Digital weight scale
Dc Motor-Speed Control
Latest Wireless Car Alarm circuit diagram and explanation
Arithmatic Logic Unit
EQG MOD FOR DIRECT STEPPER MOTOR ACCESS
Multiplexed Seven Segment Displays - Part II
Microphone Circuit Test Oscillator
ic lm2917 frequency to voltage
home security system
10 band equalizer
Audio Power Meter
APPLIANCE CONTROL USING TIMER - PROJECT
+5V, 1A DC output flyback switching power supply circuit TOP100Y
8 NC temperature adjustment
Basic circuit diagram connection of signal and power ISO103



Top