Transmitter - Received AM radio

  
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Using ceramic tuning 3. 587 mhz resonator and resonator filters are also sold with a value of 5. 5mhz, 7. 7 mhz and 10. 7 mhz. Distance transmitter range is approximately 2-4km. the working principle of this circuit are filter resonator/ceramic filtersraise the frequency of the value of the resonator filter. This frequency is amplified by the transistor can be changed t1.
Transmitter - Received AM radio - schematic

Frequency so need C7 as a regulator / placement. sound signalsuperimposed over the audio transformer. frekuensi which awakened byresonator filters and t1 is fed to the next amplifystrengthened so as to achieve the desired power passed toantenna. t2 and t3 as a buffer as a final power amp. For AM radio because it`s hard to find IC ZN 414then now could be replaced with the equivalent of IC MK 484. Frequency coverage between 550 kHz-1600 mhz, 3 pins of this IC includeseries of radio tuner, RF amplifiers, automatic gain control, the AM detector. The series voltage regulator or a power transistor made by BC108B, 4diada IN 4148, 2k7, 820R, and the 10K trimpot, trimpot functions forselectivity of the controller of all series. Then weusing a booster class A and class B amplifier for signalmodulated not disappear.



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