1. Playerk Radio Medium Wave Transmitter AM Adjustable 530‐1600KHZ DIY Kit for School Experiment
---ยินดีต้อนรับสู่ร้าน Player Kingdom--- เรามีคุณภาพดีที่สุด กดติดตามร้านเพื่อรับคูปอง สินค้ามีในสต๊อก สนับสนุนการชําระเงิน COD
Feature: 1 SOUND
AMPLIFICATION: R2, R3 for the sound source access resistor SW1 volume potentiometer, IC1 sound amplifier chip, C9 sound coupling capacitors, C11, C12 sound bypass capacitors, R1, C8 RC filter circuit, R5, D1 power indicators 2 OSCILLATION
SOURCE: Q1 consists of a common base modulation transformer oscillation circuit, generating high frequency equal amplitude signals, adjusting the CV can be set at a frequency of 530‐1600KHZ, R10, C19 for the positive feedback network, C18 for the high frequency bypass capacitors, so as to achieve a common base and the circuit, C16 power supply filtering and high frequency bypass, C17 power supply filtering; R7, R8, R9 for the bias resistor 3 HIGH FREQUENCY
AMPLIFICATION: Q2 Q1 high frequency amplitude signal further amplification, C20 for the coupling capacitance, C21 high frequency bypass capacitance, R11, R12 for the bias resistor, B2 for the high frequency broadband conduction inductance B2 secondary output high frequency voltage 4 HIGH FREQUENCY
MODULATION: C22, C23 sound capacitors, adjust SW3 to get the right sound voltage, R15 negative feedback resistor, SW2, R14 bias resistor, adjust SW2 can improve the sound quality 5 FILTER
NETWORK: L2, L3, C26, C27 for the low pass network, filter out the high harmonics, so that the waveform is close to sinusoidal, matching the antenna
Specification: Item
Type: Radio Medium Wave Transmitter Kit
Material: PCB Power
Supply: 9V2A DC, 5.5 Interface, Internal Positive and External Negative (Need to Provide Their Own Power Supply) Transmission
Frequency: 530‐1600KHZ (Radio Medium Wave Band) HF Transmitting
Power: Adjustable 20‐500 MW, Adjust The Power in 5‐10 Meters to Use
Antenna: 1.5 Or 2.5 Square Millimeters in Diameter Household Wire Can Be Used, with A Length of 2‐5 Meters (Need to Be Self Provided) Sound
Input: 3.5mm On Both Ends, Comes with Board Accessories Sound
Source: CD, Desktop Computer, Cell Phone, Etc
Applicable: Medium Wave Radio Enthusiasts, for Students to Study Wireless Signal Generation, AM Transmitter Sound Modulation Principles Package
List: 1 x Transmitter1 x Screw Package1 x Instruction Manual1 x Sound Cord
Note: This motherboard is for medium wave radio lovers only and can be a good test for ore radio effects