School Experiment 530-1600KHZ Adjustable AM Medium Wave Transmitter Kit

Features1. SOUND AMPLIFICATION: R2, R3 are sound source access resistors, SW1 is volume potentiometer, IC1 is sound amplifier chip, C9 is sound coupling capacitor, C11, C12 are sound bypass capacitors, R1, C8 compose RC filter circuit, R5, D1 are power indicators.2. OSCILLATION SOURCE: Q1 composes common base modulation transformer oscillation circuit, generating high frequency equal amplitude signals. Adjusting CV can set the frequency at 530-1600KHZ. R10, C19 are positive feedback network, C18 is high frequency bypass capacitor, so as to realize common base circuit. C16 is for power supply filtering and high frequency bypass, C17 is for power supply filtering; R7, R8, R9 are bias resistors.3. HIGH FREQUENCY AMPLIFICATION: Q2 further amplifies the high frequency amplitude signal from Q1. C20 is coupling capacitor, C21 is high frequency bypass capacitor, R11, R12 are bias resistors, B2 is high frequency broadband conduction inductance. B2 secondary outputs high frequency voltage.4. HIGH FREQUENCY MODULATION: C22, C23 are sound capacitors. Adjust SW3 to obtain proper sound voltage. R15 is negative feedback resistor, SW2, R14 are bias resistors. Adjust SW2 can improve sound quality.5. FILTER NETWORK: L2, L3, C26, C27 compose low pass network, filter out high harmonics, make the waveform close to sinusoidal, and match the antenna. SpecificationItem Type: Radio Medium Wave Transmitter KitMaterial: PCBPower Supply: 9V2A DC, 5.5 Interface, Internal Positive and External Negative (Power supply needs to be provided by users)Transmission Frequency: 530-1600KHZ (Radio Medium Wave Band)HF Transmitting Power: Adjustable 20-500 MW, adjust the power for use within 5-10 meters.Antenna: Household wire with diameter of 1.5 or 2.5 square millimeters and length of 2-5 meters can be used (Antenna needs to be self provided)Sound Input: 3.5mm interfaces on both ends, board accessories are includedSound Source: compatible with CD, desktop computer, cell phone, etc.Applicable: compatible with medium wave radio enthusiasts, compatible with students studying wireless signal generation, AM transmitter sound modulation principles. Package List1 x Transmitter1 x Screw Package1 x Instruction Manual1 x Sound Cord