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 Package List: 1 x Transmitter 1 x Screw Package 1 x Instruction Manual 1 x Sound Cord Note: This motherboard is for medium wave radio lovers only and can be a good test for ore radio effects.1. Our listing price includes the value of goods,packaging cost,and export taxes,not including international duties. 2. duties,taxes,and charges are not included in the item price or shipping fee. 3. The duties are buyers' responsibility.Please check with your country's customs office determine what these additional costs will be prior to your purchase. 4. All disputes arising from the duties will be submitted to ebay for solution. 1. Any questions, pls. contact us via ebay message or email us.We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. post a message again because sometimes our message system may block some emails. 2. If you are satisfied with our service, pls. kindly leave us a positive feedback and give us the Detailed Seller Rating with all "5 " in very area3. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders. |