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Sunday, April 24, 2011

Transmitter - Received AM radio

Posted by Wahyu Eko at 11:53 PM
AM Transmitter circuit 
To this powerful AM transmitters are huge, using ceramic tuning 3.587 mhz resonator and resonator filters are also sold with a value of 5.5 mhz, 7.7 mhz and 10.7 mhz. Distance transmitter range is approximately 2-4 km. the working principle of this circuit are filter resonator/ceramic filters raise the frequency of the value of the resonator filter.


This frequency is amplified by the transistor can be changed t1. Frequency so need C7 as a regulator / placement. sound signal superimposed over the audio transformer.frekuensi which awakened by resonator filters and t1 is fed to the next amplify strengthened so as to achieve the desired power passed to antenna. t2 and t3 as a buffer as a final power amp.


AM Transmitter Schematics


AM radio / receiver circuit
For AM radio because it's hard to find IC ZN 414 then now could be replaced with the equivalent of IC MK 484. Frequency coverage between 550 kHz-1600 mhz, 3 pins of this IC include series of radio tuner, RF amplifiers, automatic gain control, the AM detector. The series voltage regulator or a power transistor made by BC 108B, 4diada IN 4148, 2k7, 820R, and the 10K trimpot, trimpot functions for selectivity of the controller of all series. Then we using a booster class A and class B amplifier for signal modulated not disappear.

AM Received Schematics

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