Fdm Speed Controller Kd-2902 Schaltung
After getting several comments from young electronic students, I am rewriting this article to make the FM transmitter making process more clear.This tutorial is for making simplest FM transmitter using one transistor. You can make this project with less components and it is an easy and simple project for beginners.Before you proceed, please see the schematic given below. In the schematic, you will see the components required for making an FM transmitter.The transmission range of this circuit is approximately 10-20 meters.The schematic of FM transmitter is given below:You need the following components for this experiment:1. Q1- Transistor- 2N39042.
Foot pedal Use only the foot pedal originally supplied with this sewing machine: - ELECTRONIC FDM Speed Controller - Type KD-2902. Items supplied. Overlock Sewing Machine Oil Waste container Accessory box Operating instructions. Replacement (upper blade) 2 Needles Nr. 11 4 Needles Nr. 14 (2 in the machine, pre-installed) 4 Bobbin caps. 4 Spool pin (preinstalled). For those that do there is a 400 kbit fastmode and – since 1998 – a high speed 3.4 Mbit option available. Recently, fast mode plus a transfer rate between this has been specified. Beyond this, there is the ultra fast mode UFM, but it frankly is no real I2C bus.
Fdm Speed Controller Kd-2902 Schaltung Pdf
Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.Note: 0.001uF has code 102 and 22nF has code 223.3. Variable capacitor: VC1. It is also called trimmer capacitor.
You can buy one from your local store. The capacitance range should be 0-100pF or 10-100pF. If you cannot get one, try to get a trimmer capacitor that has minimum capacitance of 20pF. You can also get such capacitor from your broken radio, but you may need assistance in getting that out from your radio.4.
Smc Speed Controller
Resistors- 4.7 kilo Ohm, 470 Ohm5. Condensor/ Electret MicrophoneOn your electret microphone, you will see that on one of the pins, there is solder pad connected to the case of microphone.
Speed Controller Circuit
Remember that pin is always negative.6. Inductor- 0.1uF.6-7 turns using 26 SWG wire.You need to scrap the ends of inductor, otherwise, the inductor won’t work. Check the video given below to know how to make an inductor.Or you can also use another inductor.0.1uHLearn to make an inductor for FM transmitter7. Antenna: Use 15cm to 1 meter long wire for antenna. If you have a long antenna, the signal transmission will be better.The following picture shows the components used for making FM transmitter. You can simply follow the steps shown below.On the image shown below, you can notice that I have not used a trimmer/variable capacitor.
I have used a fixed 20pF capacitor instead. So, if you don’t have a variable capacitor, you can use a fixed capacitor also.Insert transistor, resistors and capacitors on breadboard. You can see the values of the components on the previous picture.Then insert electret microphone.NOTE: terminal touching the casing is -veUse 15cm long antenna. You can use a normal wire for antenna.Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the receiver receives a sound from the microphone of transmitter. Use the following formula for determining the frequency.Set your FM receiver for a clear, blank station.Best of luck 🙂We have made a NEW DIY FM transmitter kit.
Please for circuit details:BUILDCIRCUIT HAS RELEASED A NEW DIY FM TRANSMITTER KIT. PLEASE TO KNOW MORE ABOUT THE KIT. The range of the transmitter depends upon the length of the antenna. In your case, it should be around 10cm only.Troubleshooting:a. Did you scrap the ends of inductor? If you don’t scrap, it doesn’t work.b. Keep wires of microphone short.
If they are long, that introduces extra inductance and the frequency changes. Therefore, keep it short.c. Follow the instructions given on the page carefully.d. Change the value of VC1- variable capacitor, you may keep 20pF, 22pF, 33pF, keep on tryinge. In place of R1- 470, try with 330 Ohm resistor also.f. In place of C2- 4.7pF, insert 100pF, or 20pF or some other nearest value capacitor.
But it should be in pF only.g. Check this video: how to make inductor:h. Check this video: how to connect electret mircophone:Remember that this kind of radio projects don’t work in the first attempt, you have to make several hit and trails, best of luck. The LC is the oscillator its self, a.k.a. Tank circuit, it operates on a resonance frequency given by the formula.
Btw, i would suggest getting a frequency counter from ebay, its pretty cheap. So you can tune your fm receiver at that frequency, and you dont have to get a variable cap for that.or you could just vary the length of your inductor to tune your transmitter.looking at this formula:L = (d^2)(n^2) / 18d + 40lL – in uH (inductor)d – in inches (coil diameter)l – coil length in inchesn – number of turnsive been building transmitter for about 10years now.