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Medium wave transmitter experiment AM radio transmitter DIY kit test radio Description no battery Main characteristics of the finished product 1. Frequency range: 525~1605kHz 2. Power supply voltage: 6V 3. Circuit board size: 78mmx85mm (length × width) 4. Transmitting distance: superheterodyne medium wave radio is about 1 meter, and direct type medium wave radio is about 0.5 meter Features 1. The circuit is simple. It is only composed of commonly used triodes and resistance-capacitance components, and it is easy to manufacture without audio transformers; 2. The sound quality is good. Within the rated transmission distance, the sound quality is close to that of FM broadcasting, and the signal-to-noise ratio is good. Especially the effect of receiving with a repeater is not much different from that of direct broadcasting of the modulated signal; 3. No external antenna is needed (medium wave needs tens of meters), and the receiver is completely affected by the magnetic field leaked by the magnetic rod, which is easy to implement, but the transmission distance is relatively short; 4. There are many interfaces, designed with various levels of transistors, quiescent current test jumpers, and external power sockets, which are easy to use and expand functions; 5. It can be used with an external power supply, or it can be used independently by adding a battery pack module (battery power supply board). product description 1. This kit uses a fully discrete circuit, which is especially suitable for students to learn working principles, practice production and test; 2. Variable capacitors use frequency modulation and amplitude modulation quadruple variable capacitors, and connect two amplitude modulation couplings in parallel to obtain sufficient capacity. The quadruple is better than the common 223P AM double-connected variable capacitor, and it feels better; 3. The circuit board base is made of glass fiber material, the thickness measured is about 1.5~1.6mm, the single-sided green/butter white lettering, the pad is sprayed with tin, and it can be directly soldered without grinding; 4. The circuit board obtained by the buyer may be slightly different from the sample in the picture, mainly due to the change of component position and the same circuit structure. This product has been modified and perfected n times from trial-produced samples to products sold (mainly to modify the wiring of the circuit board), and is still in continuous improvement. Usually minor insubstantial modifications, such as slight movement of component positions and minor wiring adjustments will not change the version number, and will not re-photograph and upload, hereby declare; 5. The manual contains circuit schematic diagrams and circuit board diagrams, as well as debugging methods and experience under amateur conditions. If you need more information and professional debugging methods, please download or refer to relevant professional books on the Internet; 6. The transmitter board is equipped with a 3.5mm headphone signal line, and the battery-powered board is optional and non-essential, without batteries. Effect This transmitter works well within the effective distance (0.5~1 meters), and the sound fidelity is high, especially with direct-type radios (such as our store’s 636 and 68-1 single-tube machines) with our self-made high resistance. When listening to the earphone, the sound quality is not much different from that of the player directly. package ： 1pcx 1 pair JLH 1969 Class A HIFI Amplifier Board MOT/2N3055 Golden Quality PCB DIY Kit If you have any questions, please contact us in time, we will help you deal with the problem for the first time. Shipping Item will be shipped within 24 -48 hours after full payment is received. Normally the shippment to worldwide is used to take 15 to 30 business days, exclude Sat & Sun. Payment Payment must be received in 7 business days of auction closing. Please leave note for your special request (e.g. Colors or Size) in ebay note when you pay the order. Any special request cannot be accepted after 24 hours of payment,because most of orders will be processed instantly and same day dispatched. Contact Us If you have any questions, please feel free to email our servicer ，and we will reply you ASAP. If no response within 24 Hours, please check the spam of mail box or kindly re-send it to us. We greatly appreciate your POSITIVE feedback. Please do NOT leave negative or neutral feedback without any contact. If you haven’t received item in 45 days, please contact us and we will arrange refund or resend Feedback We care about our valued buyers, if you have any questions, our Customer Service staffs will be very glad to help you. We try our best to reply your email as soon as possible, please kindly allow 24 hours(working day) for us to response. Thank you. We greatly appreciate your POSITIVE feedback. Please do NOT leave negative or neutral feedback without any contact.
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