AM/FM radio circuit using ULN-2241A and ULN-2283B
Source: InternetPublisher:念慈菴 Keywords: AM FM Updated: 2023/12/06
The ULN-2241A used in the picture is an intermediate frequency amplifier integrated circuit, and the ULN-2283B is a low-power audio amplifier integrated circuit. The amplitude modulation or frequency modulation function can be realized through the switch S. In the figure, A is connected to the AM switch contact, and A1 is connected to the IF amplifier. A2 is connected to transistor VT2.
Some component specifications:
VD1: AM varactor diode TA314
VT1: Transistor MPS3563, used for FM high frequency amplification
VT2: Transistor MPS3563, used for amplitude modulation converter
T1: Magnetic rod antenna coil, 571uH, turns ratio 17:1, quality factor Q=150
T2: RW0-6A7640BM amplitude modulation heterodyne circuit, turns ratio 11:1, quality factor Q=50
T3: RLCS4A893GO amplitude modulation detector circuit, 256uH, turns ratio 5.4:1, quality factor Q=75
T4: BKAC-K3651HM FM detector circuit, quality factor Q=65
T5: BKACS-K4551A0 FM input circuit, turns ratio 7:1, quality factor Q=90
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