0.5W AM Transmitter

307

03:28:56

24/01/10 - Release Circuit, but it does not work in real environment
24/01/22 - Fixed Circuit (Tested in real environment)
24/08/09 - Improved Efficiency and Output Power

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LO Signal : 0.5 ~ 2MHz (Amplitude : 2V)
Use this circuit (LO Circuit) :
https://everycircuit.com/circuit/6012868071522304

If you change LO Frequency, need adjusting output LC value

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Baseband Signal : Recommend 50Hz ~ 100KHz (Amplitude : 1V)

You can use audio signal (Amplitude : 1 ~ 600mV)

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Tested Component, Condition : 

Input Power : DC 9V @ 250mA
Output Power ≈ 0.5W (27dBm)

LO Frequency OPAMP : LF356 × 2
Baseband Frequency OPAMP : UA741 × 2

Negative Voltage Generator : ICL7660 × 1

RF Output Amp NPN Transistor : 2SC1815 × 2
Power Regulating NPN Transistor : 2SD880 × 1

published 1 year ago

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