Wireless am microphone

  
Transistor Ql and its associated components comprise a tuneable rf oscillator. The rf signal is fed to transistor Q2, the modulator. Operational amplifier ICl increases the audio signal and applies it through resistor R4 to the base of Q2. Tune an AM radio to an unused frequency between 800 to 1600 kHz. Tune Ll for a change in the audio level coming from the radio. Peak the output by adjusting L2
Wireless am microphone - schematic

If Ll is disturbed, it may be necessary to readjust L2 for peak performance. Depending on the impedance of the microphone audio sensitivity can be increased by decreasing the value of RIO and vice versa.



Recommended videos


  • Populaire video
     
  • Amplitude Modulation tutorial and AM radio transmitter circuit
    Duration: 7:44.
  • Build your own FM transmitter with no special parts needed
    Duration: 33:56.

News


  • Car and Driver (blog)
    Car and Driver (blog) With the departure of the raspy-sounding rotary engines and the introduction of the very quiet diesel, Mazda will go from having one of the loudest cars on the Grand- to one of the quietest. This doesn't mean the RX-8 wi
     22 June 2012

.

Rating


Rating: 0.00 / 10 (0 Vote cast)

Leave Comment

characters left: