How to build a Simple FM Transceiver | FM Transmitter and Receiver Combo with S9018
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- Опубликовано: 28 авг 2024
- In this video tutorial, we show a simple circuit diagram made with S9018 Transistor that functions both as an FM transmitter and an FM receiver. This could be used as a simple Walkie-Talkie.
P.S C3 is 10pF to 30pF not 0.1uF.
i was seek to know s9018 but you you give me answer thakns so much
Stay enthused. Remain creative. The world belongs to people who dare to dream.
Nice work and an interesting circuit! Correct me if I'm wrong, but this doesn't appear to be a superregenerative design, so the tuning must be very sharp and fiddly. And are you sure C5 (100 nF) - the AF filter - is not unduly high? I would expect a value of 10 nF for this capacitor.
You are right... it is not a super-regenerative receiver (it is a regenerative receiver) and very finnicky to tune but once it starts working, it is easy to tune in the next time. Also, you may wish to have a big plate for the grounding to improve the reception (in this case, you ground the 0 volts line to the plate).
For the capacitor, try any value for a reception range of 88 MHz to 108 MHz.
@@hecanet Tnx for your reaction! I'll give your schematic a try soon. I'm curious how it compares to my 1,5V 4 transistor version with a BF180 oscillator transistor. Happy soldering!
0:39 at this timelapse,is the circuit diagram same for both transmitter and receiver?
That is the Receiver. Although it is very similar to the transmitter... just that you need the microphone input for the transmitter and then the antenna connection instead of the speaker connection at the output of Q2 and C2 circuit.
Hi. Can you tell me the values of the two inductors? Also, in this receiver circuit, is the the emitter inductor used to place the transistor more towards cutoff, so it's operating at the knee, and hence acting as a converter/mixer (and hence subtracting the incoming FM from the oscillator frequency and leaving the original audio frequencies)? Lastly can the emitter inductor be removed when this circuit is used as a transmitter?
L3 is about 10uH. L2 should be calculated alongside VC1 to give you whatever frequency you want to operate within. Use www.hecaworld.com/omni-calculator/ for the Frequency calculation. In this project it was made of 5 turns on a 5mm diameter from a 22AWG enameled copper wire.
And yes, you can remove L3 when used as a transmitter.
I am going to build the radio as I have already built my own transmitter . But... are you selling both your version of the radio and transmitter? Id love to pay you! Thank you so much for your very nice circuit, explanation, and quick response!!!@@hecanet
@@dhrovner inbox us at info@hecaworld.com
Sir, when it's connected into a transmitter, where is the place for audio input ?
Pause the video at 0:39 time stamp and observe C4. That is your input for the transmitter. If you are using a condenser microphone, connect one terminal of a resistor (say 2k2 for a 3 volt power supply) from the +ve power supply and connect the other terminal in series with your condenser microphone. Connect the remaining terminal of your condenser microphone to ground (0 volt).
Now, connect the middle point (where the resistor and microphone connected) through C4. You many change the value of C4 to different values. C4 will attenuate the input signal depending on its value (it will offer reactive impedance, Xc, determined by the formula Xc = 1/(2pi*F*C).
Checkout our other similar circuits as well.
1. Transmitters:
a. ruclips.net/video/nz2HNvfTZ3Q/видео.html
b. ruclips.net/video/A-qjER2APtY/видео.html
2. Receivers:
a. ruclips.net/video/zY3R8vT0798/видео.html
b. ruclips.net/video/9RlLurlGVRo/видео.html
Pause the video in this link at the 8 minute mark to see how the resistor, microphone and capacitor are connected: ruclips.net/video/lbDqyRg29lU/видео.html&lc=UgyWjVt7IP6THNlRLDF4AaABAg
@@hecanet Your explanation is very clear. Thanks so much, sir !
👏👏👏👏👏👏
Sir, what's the difference between a transmitter and receiver in connection ?
They are basically the same apart from the Emitter Circuit RF choke. Remove that for a pure transmitter.
This type of FM transmitter will cause interference to FM receivers if you tune them in close proximity.
@@hecanet Thanks !
You literally provide no description of toroid used
It is a 10uH inductor. If you have any specific question, please ask and we'll respond as time permits.
its not fm
How so? Did you try it?
it is fake
Are you saying it is fake because it did not work for you or something else? I can ship this one to you if you give me a paid postal service code to drop it off for you.