circuit wiring

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.

For AM radio because its 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.

BA1404
transmitter includes onboard RF amplifier for increased transmitting
range. Operating voltage range is 1-3V, the circuit contains FM stereo
mixer, 38KHZ oscillator, FM modulator and high-frequency amplifier
monolithic integrated circuit. As the electronic newspaper BBS there
are many users requiring detailed information on the FM stereo
transmitter, so I re-collect the relevant information on the simple
discrete, merge, integrated FM stereo transmitter experiment, that
BA1404 with μpc1651 mix of the most easy to make and debug, and very
high frequency stability (relative to the previous circuit BA1404),
transmission power is increased by UPC1651RF amplifier.