Great video, I expect the second credit card may have failed as because it wasn't the NFC or RF smart card type where the chip is connected to a coil embedded within the card. This creates what is essentially a tuned circuit within the card and may play a role in the rectification process displayed.
does it work with sim for mobile phone? I use a trimmer from 6 picofarad to 22 picofarad and I only capture 2 posts, I still have a trimer from 10 picofarad to 40 picofarad, is it good to change with it to capture more of the program?
Yes. Start with one fixed capacitor to pair up with the variometer (variable inductance). You may need to try other values of fixed capacitors to tune to other stations if the variometer cannot tune to that frequency range m. Good luck.
This is the chip on a smart credit card. You can try a phone SIM card as well. Just use a multimeter to test the resistance of any 2 contact points. Then swap the red and black testing pins and test again. Pick the two points with the biggest differences in resistance as the detector for your radio
I tried the sim method and it worked👍
Two months ago i asked him to try a sim card, and i see he Will. Thanks
Great video, I expect the second credit card may have failed as because it wasn't the NFC or RF smart card type where the chip is connected to a coil embedded within the card. This creates what is essentially a tuned circuit within the card and may play a role in the rectification process displayed.
Very interesting 🤔 billy. I wonder if you can use the security store sticker inside some peoducts?
Your a Genius
You really can't use the ohms range to check the forward voltage of a diode.
Amazing idea! In your opinion would this work better as a detector than a blued razor blade like in a fox hole radio? Many Thanks.
Có thể dùng thẻ sim không billy?
very cool. i subbed to see what other interesting stuff you do. have you tried the old razor blade coherer or the crystal and whisker?
does it work with sim for mobile phone? I use a trimmer from 6 picofarad to 22 picofarad and I only capture 2 posts, I still have a trimer from 10 picofarad to 40 picofarad, is it good to change with it to capture more of the program?
Wait we only need one capacitor? Wtf. I've been trying to build a crystal radio since i was a kid. I had a kit but i lost the crystal. Lol
Yes. Start with one fixed capacitor to pair up with the variometer (variable inductance). You may need to try other values of fixed capacitors to tune to other stations if the variometer cannot tune to that frequency range m. Good luck.
I subscribed friend.🙏🏻
Is that the same as the sim card on a cell phone.
This is the chip on a smart credit card. You can try a phone SIM card as well. Just use a multimeter to test the resistance of any 2 contact points. Then swap the red and black testing pins and test again. Pick the two points with the biggest differences in resistance as the detector for your radio
Would an old sim card work as well?
It could work. Just need to test which two spots behaves like a diode using a multimeter.
Bien ,yo tengo algunas radios con este sistema ,con chips de tarjetas o de movil
Billy please your email,i have problem with may (setup 3DQ) cryistal radio.
sorry, I cannot provide email. you can leave message here if you have any questions.
@@BillyCdiy Ok,i make a video on my chanel and send link.
AND CARD SIM. LED.TRANSISTOR NPN. IC.................
爲什麼你的錄音，總是聲音很小聲。
池恩東 , 用室內天線，所以礦石收音机輸出弱。下次會用到長天缐，輸出會強一點。
Billy Cheung 很显然说的是你视频说话的录音很小…