Untitled DocumentUntitled Document50mW. AM Transmitter DIY Kit for learning.
This kit need soldering and electronics skill.
Frequency = 1,500 -1,600 KHz.
Power Supply = 12V DC.
5 Transistors + 1 IC
PCB Size = 84 X 40 mm.

Download Schematic

Q 1 = Colpitts Oscillator
Q2 = Buffer
Q3 = RF Amp
Q4 = Audio Amplifier
Q5 = AM Modulation
IC1 = 5V Regulator

Range solely depends on the antenna used. For most applications, a length of wire 3–10 feet is sufficient, but do not exceed 10 feet.
A good earth ground connected to the negative side of the power supply will help. Range with this length of wire is 50– 200 feet, and more if some effort is made in the area of antenna matching.

Sample video

Part or K

R11

4.7K

R14

220 or 270

C1

40pF

(Trimmer)

C2,C15

100pF or150pF

(101) or (151) NP0

C3,C14

0.1

(104)

C4,C5

0.0033uF

(332)

C6,C7

0.01uF

(103)

C8, C12

10uF

C9,C13

0.0022uF

(222)

C10

0.0039uF

(392)

C11

0.001uF

(102)

Q1,Q2,Q3,Q4

2N3904

Q5

2N3906

D1

LED

IC1

6.8uH

Ear Phone Jack

PJ3014A

Antenna Jack

BNC

DC Power Jack

DC005

PCB

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