Brand Name:icchipcn.com
Condition:New
Type:Logic ICs
Instructions for the Use of Electronic Tube FM Radio
1. Circuit Construction and Design Principle
This machine belongs to the typical superheterodyne radio. It adopts the design form of a whole circuit board, including high frequency reception, intermediate frequency amplification, limiting, frequency discrimination, stereo decoding, preamplifier, etc. The output is stereo sound signal. It can be equipped with various types of electronic tube power amplifier, active speaker, stereo equalization amplifier and other equipment. Specific circuit configurations are as follows: high-frequency reception uses bipolar 6N3 for high-frequency amplification and mixer amplification, bipolar 6N1 for local oscillation. Two-stage pentode 6K4, two-stage limiting and pentode 6J4 are used for IF amplification. The decoded audio signal is switched to the bipolar transistor 6N2 by the switch of the converter for 5 times pre-amplification. The output audio signal is fed to the power amplifier of two 6P1s pushed by a bipolar transistor 6N2, and the sound is restored by the loudspeaker.
2. Machine highlights
This machine has light weight, high receiving sensitivity, using electronic tube to receive FM signal, has a strong sense of nostalgia, sweet voice, mellow, using potentiometer and varactor diode to tune, solved the trouble of using air capacitor to do cable drawing system, at the same time, using digital tube to display receiving frequency, using 6E2 to display receiving signal intensity, increase visibility and ornamentality. The use of net cover design can prevent children from accidentally touching scalds and electric shocks. The panel is oxidized by CNC numerical control processing, and the shell is welded by stainless steel bending. The cost is reduced. The knob is also polished by CNC processing, which shows high-end atmosphere. The circuit board of the whole machine is made of 2mm thick PCB, which increases the mechanical strength and is not easy to be damaged. The power amplifier is installed separately and easy to be maintained.
3. Machine parameters:
Shell Material: Aluminum Alloy + Stainless Steel. Receiving band range: FM87-108 MHz
Power supply voltage: 198V-242V channel number: 2, stereo
Full power consumption: 100W machine size: 374X240X140 mm
Net weight: about 8kg receiving form: superheterodyne
Output power: about 3W + 3W
4. Important Machine Components
Power transformer, electronic tube, high voltage filter capacitor, tuned resonant inductor, varactor, etc.
5. Functional description of each knob interface head
6. Use Steps
1.Connect the antenna and connect the antenna connector with the external antenna. This machine distributes SL16 connector. If you are in the urban area and the signal is good, you can connect a conductor about 2 meters on the antenna connector and receive FM radio when it reaches out of the window. Of course, if you want to receive more radio signals, you must use an external omnidirectional outdoor antenna. The connection method of SL16 connector can refer to the connection method of CCTV signal.
2.Plug in the power cord that meets the requirements of the machine. The machine uses 220V voltage.
3.Connect the output terminal of the speaker with the input terminal of your speaker by the speaker connecting wire. Connect two groups of speakers, recommend using 4 inch to 8 inch full-frequency speakers for the best!
Be careful! Do not use this machine without a speaker!
4.Turn on the power switch, light the indicator, wait for about 20 seconds to listen to the radio. By rotating the tuning knob, different radio signals can be selected, and the frequency meter will display the current radio frequency. The green indicator bar of the tuning indicator tube will close very tightly when the signal is best.
5.Turn off the power switch at the end of listening.
6.Young children are not allowed to touch the electronic tubes and other components of the machine in order to avoid safety accidents. Please cover the net without using the machine.
VII. Probable Problems and Solutions in Use
1.If the machine does not work, check whether the socket has power supply.
2.Check if the antenna is not good. Are you in bad contact?
3.Have periodic noise, check whether there is interference from high frequency equipment around the machine?
