Thank you, engineer. I did not know why I put the 20-turn coil and what is its role, because there is a special five-turn coil for a resonance circuit with a frequency pickup coil.
Nice design, I definately want to try it. I'll probably use a BF-series NPN transistor. However I wonder why we couldn't use like a BC547; its f_T is still about 300 MHz and its overall gain is higher so it could make up some losses. 🤔
Hi my friend. Thanks for your comment. I tried a few other type of transistors, like 2N, o BC series but it didn't work. Sure, you can try and test. If you success, share with us your experience. Good Luck!!
300 Mhz is the max of those transistors at only unity gain so probably (as I am like intermediate level of knowledge for radio technology) not enough gain with higher frequency like 100 mhz etc. Even for AM radio , using 2n2222 I needed 3 transistors amplifiers to have enough gain. Before I made that mistake that i used cheap transistors from Aliexpress for everything , now I am smarter and I buy only original ones and I try to choose the transnistors for their purpose if I am doing RF Ichoose transistors for RF, if a power amp, I choose power transistors etc. They design transistors for a specific task so if you use for something different it is not going to work ...
It should not be a problem to use the BC 547 or 2N types in this circuit. You just need to adjust and tweek the bias resistors and or the feedback load/variable resistor and the supply voltage. Set this up with all the above parameters as variable trimmer pots till you establish the optimal values and replace with fixed values. Good hunting!
Hi. Normally it's RFC(Radio Frequency Choke) coil. I found a toroid coil from my scrap box and used it. I took it from an old SMPS power supply. It works without any problem. Diameter of toroid is 10mm and 30 windings of 0.1mm copper wire. Good luck!
Very interesting! This does not look like a super-regenerative circuit (no quench oscillator), actually it's more like a transmitter than a receiver, especially since the base is not grounded like in most simple FM receivers. Therefore I do not understand how coupling in phase between collector and emitter is possible. One question: the schematic shows a battery of 1,5V but in the video it looks like you're using 2 batteries (3V). Does it also work on 1,5V? Tnx
Hi my friend ! You're exactly right. It looks like a transmitter and already it is. I didn't test, but i'm sure that if you connect a microphone to base of the transistor, it works as a transmitter. Already you can see same constructions, as coupling between C and E at FM transmitter schematics as well. In the video, looks as if i used two batteries. It's correct, but one of the battery is a dummy battery :) It's was a dead battery, i made jumper between positive and negative, so it's became just like a conductor. Because i had no battery holder for one battery, only i had for two batteries. So i used it as a fill the blank place of battery holder. Also, i got the best performance at 1,5 V DC. Greetings!!
@@nusyil Tnx for the friendly reaction! I just finished my experiments with a similar schematic but the difference is that the HF transistor (BF 180) in my design is working in common base mode (base grounded) while yours works (partly) in common emitter mode as a mixer. Mine also works with only a 1.5V battery en is so sensitive that an antenna is not needed. The quality of the sound is much better than I expected. I believe that for optimal sensitivity the transistor needs to oscillate weakly (so a low battery voltage helps!) and being able to regulate this 'soft spot' smoothly is the key to succes. If you are interested I will send you the schematic and some photos. How can I contact you?
@@erikdevriese671 Hi. Thank you very much my friend. Sure, i want to see them. This is my e-mail adress : mateksmakina@hotmail.com I'm looking forward to hearing from you..
usta kolay gelsin.anlattıklarını teknik konu olduğu için hemen hemen hepsini anladım.ama ingilizce yazmak bana zor geliyor o yüzden tükçe yazdım..yaptığın radyo sadece yabancı kanalları çektiğini farkettim.her nerdeysen selamlar.kanalı yeni farkettim.kolay gelsin.
It's definitely a superregenerative. I used a 2n3904 and it seemed to receive something or maybe I imagined it.. I don't have a good amplifier, only gain 20. I replaced the transistor with an s9018 and despite the long wires, it receives many stations although one station local is everywhere. The sound is very weak but because of the amplifier. Do you think that an lm386 with a gain of 200 is enough?
@@nusyil Btw can you make a video on how to assemble it? Bcuz i wanted to make it but i understand how all the connection goes but i dont know how to connect the gang capacitor
@@PekaVuite My friend, i am newbie in RU-vid and take videos :) I don't promise you take a video about how to connect gang capacitor. Pls check this : www.petervis.com/electronics/tuning-capacitor/tuning-capacitor.html Good luck!!
@@nusyil Hi On the board I can't see the capacitors. Have I too small screen ? By the way ... Capacitor 30p should be connected to resistors ? There's no dot at crossig the lines so Im not sure...
@@dominikbatorski3121 If you pause the video at 1:45 and get the full screen you can see clearly capacitors. You right, only i didn't install 330nf Audio out capacitor, since the amplificator which i connected, has internal input capacitor. And yes, the 30pf antenna input capacitor is connected to the resistors and the Base pin of the transistor.
Hello, how can we mute the sound at an empty (noise) frequency on the fm radio, what should I use for this? example : vzsssssssssssssssssssssssssssssssssssssssss (white noise)
Selam. Kullanılan devreye göre değişiyor. Bazı entegrelerde, örneğin TDA 7000'de bu özellik var. 1no'lu pini 10k direnç ile besleme gerilimine bağladığınızda White noise'i kesiyor. Diğer devreler ve entegreler için kullanılan komponenetlerin datasheet'lerine bakabilirsiniz. Ancak genel amaçlı, her FM radyo'ya uygulanabilecek universal bir devre veya uygulama var mıdır bilemiyorum. İnternette "FM receiver white noise canceller" vb aramalar yaptırarak bir fikir edinebilirsiniz. Kolay gelsin.
@@microxone Hi my friend. I don't recognize the 194C transistor. You can use any VHF-UHF or FM transistor. Like some BF series transistors.(e.g BF199).Good Luck!
Hi my friend. No, you cannot use them. They are not High frequency transistors. They are low frequency amplificator transistors. You should use one of the FM, VHF or UHF transistors. Good Luck!!
@@michaeljoshuamanallo1742 You cannot use C945 neither my friend. You can use BFseries high frequency transistors, e.g. BF197-198-199-240-422, ED1502 etc. For more information, you can investigate in internet.
@@michaeljoshuamanallo1742 No, neither my friend. Google says, that transitor is an AF amplifier transistor, so you cannot. Please use Google to find datasheets of the transistors that you have. Good Luck!!
I couldn't see where you connected the antenna to and I couldn't see most of the equipment you were using, very poor video etiquette, do you ever review your videos before posting online? I'm asking because everything you talked about was out of sight and you know what that makes you? Nothing you did was satisfactory.
