UUUUUUAAAAUUUUU !!! Gostei. Já enrolei a bobina maior. Pretendo fabricar o capacitor variável, pois minha intenção é fazer tudo o que for possível artesanalmente. Se eu conseguir concluir antes do 4° milênio... 🤣🤣🤣🤣🤣 Fazem 2 anos que estou para fazer um FM Galena. Acho que agora conseguirei ! Muito bom o seu vídeo !!! Parabéns !!!! (SP - BRAZIL)
@@Tio-maicon. Tio-maicom,.. Comprei tudo para fazer um galena FM. Base em Mogno com cantos trabalhados 100 gr de fio 20, 100 gr de fio 22, 100 gr de fio 30, fio 3 mm 1 metro de tubo para enrolar a bobina... Mas falta tempo. Sabe como é, né? Sou aposentado e... e... Não tenho tempo...🤣🤣🤣 Preguiça comprovada !!! Mas até o 4º MILÊNIO CONSEGUIREI> ABRAÇOS !!! 👍👍👍
You can obtain more precise measurements by using a wristband with a ground connection. Touching the capacitor or coil with bare hands while measuring with an LC meter will give incorrect values due to static electricity. The LC meter I use in my workshop is JUNTEK Model: LC-200A (Made in PRC), and I combine and reset the probes before each measurement. Otherwise, the measurement will be inaccurate. As an additional note, I prefer a non-rechargeable Lithium 9V battery as the power source for the LC meter. I do not recommend using an 9V adapter from a BNC jack input or the 5V supply with the powerbank.
Hi I saw that you use different types of crystals for fm and am I use two schottky 1n5819 in series and it works perfectly for Am. I replaced with them the one with germanium that detects at 0.290mv, I didn't try it with fm due to lack of time. I have raw galena crystals and silver pyrite would it be possible to use for fm?
Hi, if I understand your qustion correctly: "What is the voltage of the power supply?". My cryatal radios do not need battery. You just hook up to the right antenna to harvest the radio broadcast. The energy transmitted by the radio transmission station is sufficient to drive the eardbud to produce sound. That's the beauty of the Cryatal Radios. No battery required.
Apologies. I do this for hobby only. Not planning to sell at this moment. You can reference my videos to diy. ruclips.net/video/Cfu7runJGF8/видео.html You can also visit my blog where I suggest what parts to buy. 1.bp.blogspot.com/-NNHHC-qGswA/X1oOHSSOo7I/AAAAAAAADaA/xskpS6h7ZRAfgCoxOGFjJJsaWiGt5MJuQCLcBGAsYHQ/s2048/IMG_5669.JPG
@@BillyCdiy No worries. This helped a lot already. Have you considered to use some am signals, just to collect some additional power for signal or sound amplification? There is many led circuits that only use joule thief, or joule ringer and antenna (Tesla antenna and Barbosa Leal effect also boosts the power harvest).
@@Kangsteri , thanks for the suggestions. There were different ways to harvest additional power from other bands of radios to let the Mos FET operate in a regeneration mode which will boost the volume and increase selectivity. I tried that but found that a bit unstable hence did not make a video on these. Also the idea of using mos FET in crystal sets already stirs up enough debate whether this is really a crystal radio. Boosting volume by other means will certainly add oil to that debate .
@@BillyCdiy I think passive boosting is not cheating :D It's not practical to make pencil transistors and air capacitors if it's possible to buy. Even with 1.2 - 1.5v battery it would be fine. It usually is easy to get 0.5 - 1.5v from antenna harvesters or even earth battery. My dream is to get AM FM walkie-talkie that could be used without battery. Or could be used to charge small battery / super capacitor, in open areas.
@@Kangsteri , my home is located within 4 km from an AM station on an island across the sea in HK. I used to be able to use the led as detectors and light them up at the same time. I also tried charge an Nimh battery with some success l. However since last year, the station has been shut down fir maintenance, hence I cannot get a strong enough signal to try these again .
@@Oziel-hh2du7ml6r , I used a low voltage Mos FET called 3DQ (3SK143) as the detector. You can also used any diodes that can work in the FM radio frequency eg 1SS86
FM band frequency range is 88 MHz-108MHz L=61 nH ( or 0.061 uH) Cx=20 pF to 4 pF On internet Resonant Frequency Calculator says 145 MHz to 325 MHz, L=165 nH = 0,165 uH 88 MHz need C= 19.824 pF and 108 MHz need 13.162 pF proper FM frequency range... L=61 nH and Cx=54 pF to 38 pF capacitor range, We need at least about 33 pF capacitor. I guess you used a parallel 33 pF capacitor on that female audio jack 3.5 mm,
Thanks for your calculations. There are stray inductance and capacitance involved that cannot be easily calculated. The values I used is based on many years of trial and error.
Hello Billy I have question I have a variable capacitor 15 to 385 pf My range 500 to 2300 khz Too much Can I put a disc capacitor In parallel with the variable? Would that affect q etc ? I want to build a 1000 to 1700 khz Radio and only need a 115 to 485 pf Range Thanks !
No. Connecting in parallel will increase the capacitance, not reduced it. To reduce it, you can connect a disc capacitor in series with the original variable capacitor. Any additional component to a radio circuit to add or reduce capacitance or inductance will only decrease the original Q factor, not increase it. Imagine adding some liquid to pure water. the liquid will only add impurity, not make original water more pure.
Сколько не пытался повторить, ничего не работает. СВ детектор без проблем работает, а фм это наверное надо под передатчиком стоять. Даже с внешним усилителем звука тишина.
@@Mylo_Veryovkin всякие пробовал, много разных германиевых и советские свч, и даже рекомендованные из видео, видимо расстояние от вышки критично решает
UUUUUUAAAAUUUUU !!!
Gostei.
Já enrolei a bobina maior.
Pretendo fabricar o capacitor variável, pois minha intenção é fazer tudo o que for possível artesanalmente.
Se eu conseguir concluir antes do 4° milênio... 🤣🤣🤣🤣🤣
Fazem 2 anos que estou para fazer um FM Galena.
Acho que agora conseguirei !
Muito bom o seu vídeo !!!
Parabéns !!!!
(SP - BRAZIL)
Deu certo amigo?
@@Tio-maicon.
Tio-maicom,.. Comprei tudo para fazer um galena FM.
Base em Mogno com cantos trabalhados
100 gr de fio 20, 100 gr de fio 22, 100 gr de fio 30, fio 3 mm 1 metro de tubo para enrolar a bobina...
Mas falta tempo.
Sabe como é, né? Sou aposentado e... e... Não tenho tempo...🤣🤣🤣
Preguiça comprovada !!!
Mas até o 4º MILÊNIO CONSEGUIREI>
ABRAÇOS !!! 👍👍👍
You can obtain more precise measurements by using a wristband with a ground connection. Touching the capacitor or coil with bare hands while measuring with an LC meter will give incorrect values due to static electricity. The LC meter I use in my workshop is JUNTEK Model: LC-200A (Made in PRC), and I combine and reset the probes before each measurement. Otherwise, the measurement will be inaccurate. As an additional note, I prefer a non-rechargeable Lithium 9V battery as the power source for the LC meter. I do not recommend using an 9V adapter from a BNC jack input or the 5V supply with the powerbank.
This guy is a legend !!!
I wonder how close the radio stations need to be?
My home is 13km from the FM broadcasting station. I can receive FM in my crystal radio using a Yagi FM antenna.
Hi I saw that you use different types of crystals for fm and am I use two schottky 1n5819 in series and it works perfectly for Am. I replaced with them the one with germanium that detects at 0.290mv, I didn't try it with fm due to lack of time. I have raw galena crystals and silver pyrite would it be possible to use for fm?
Fm reception by crystal is possible. I tried with fools gold crystals. However much less sensitive. So you need a stronger FM signal .
@@BillyCdiy thank you
Molto interessante quali componenti ci sono
Hi Billy, why is the antenna coil made of silver wire? Could we just use 2mm copper wire for both of the coils? 😁
Yes, you can use regular 1mm or 2mm copper wire to replace the silver plated cover wire which has less resistance.
Are you in HK or Canton ?
@@eddyyu7091 ，HK
Sounds better than the big loop.
Quantos volts de alimentação?
Hi, if I understand your qustion correctly: "What is the voltage of the power supply?". My cryatal radios do not need battery. You just hook up to the right antenna to harvest the radio broadcast. The energy transmitted by the radio transmission station is sufficient to drive the eardbud to produce sound. That's the beauty of the Cryatal Radios. No battery required.
Do you have some kind of full kit for sale to build this? Or what parts do i need to order for optimal system?
Apologies. I do this for hobby only. Not planning to sell at this moment. You can reference my videos to diy. ruclips.net/video/Cfu7runJGF8/видео.html
You can also visit my blog where I suggest what parts to buy. 1.bp.blogspot.com/-NNHHC-qGswA/X1oOHSSOo7I/AAAAAAAADaA/xskpS6h7ZRAfgCoxOGFjJJsaWiGt5MJuQCLcBGAsYHQ/s2048/IMG_5669.JPG
@@BillyCdiy No worries. This helped a lot already. Have you considered to use some am signals, just to collect some additional power for signal or sound amplification? There is many led circuits that only use joule thief, or joule ringer and antenna (Tesla antenna and Barbosa Leal effect also boosts the power harvest).
@@Kangsteri , thanks for the suggestions. There were different ways to harvest additional power from other bands of radios to let the Mos FET operate in a regeneration mode which will boost the volume and increase selectivity. I tried that but found that a bit unstable hence did not make a video on these. Also the idea of using mos FET in crystal sets already stirs up enough debate whether this is really a crystal radio. Boosting volume by other means will certainly add oil to that debate .
@@BillyCdiy I think passive boosting is not cheating :D It's not practical to make pencil transistors and air capacitors if it's possible to buy. Even with 1.2 - 1.5v battery it would be fine. It usually is easy to get 0.5 - 1.5v from antenna harvesters or even earth battery. My dream is to get AM FM walkie-talkie that could be used without battery. Or could be used to charge small battery / super capacitor, in open areas.
@@Kangsteri , my home is located within 4 km from an AM station on an island across the sea in HK. I used to be able to use the led as detectors and light them up at the same time. I also tried charge an Nimh battery with some success l. However since last year, the station has been shut down fir maintenance, hence I cannot get a strong enough signal to try these again .
Hello, can you tell me what the approximate distance is to the stations you can receive?
The FM radio transmitters are about 15km away
@@BillyCdiy Thank You. That"s better than I thought!
Qual é o componente dector?
@@Oziel-hh2du7ml6r , I used a low voltage Mos FET called 3DQ (3SK143) as the detector. You can also used any diodes that can work in the FM radio frequency eg 1SS86
@@BillyCdiy Muito obrigado valeu.
FM band frequency range is
88 MHz-108MHz
L=61 nH ( or 0.061 uH)
Cx=20 pF to 4 pF
On internet Resonant Frequency Calculator says 145 MHz to 325 MHz,
L=165 nH = 0,165 uH 88 MHz need C= 19.824 pF and 108 MHz need 13.162 pF proper FM frequency range...
L=61 nH and Cx=54 pF to 38 pF capacitor range, We need at least about 33 pF capacitor.
I guess you used a parallel 33 pF capacitor on that female audio jack 3.5 mm,
Thanks for your calculations. There are stray inductance and capacitance involved that cannot be easily calculated. The values I used is based on many years of trial and error.
Scheme?
You can refer to the circuit diagram from thus video. ruclips.net/video/Cfu7runJGF8/видео.htmlsi=-38vnkDhxO7_6z-V
CIRCUITS DIGRAM PLEASE
here: billydiy.blogspot.com/2021/05/ring-fm-crystal-radio-i-purchased-few.html
Hello Billy
I have question
I have a variable capacitor
15 to 385 pf
My range 500 to 2300 khz
Too much
Can I put a disc capacitor
In parallel with the variable?
Would that affect q etc ?
I want to build a 1000 to 1700 khz
Radio and only need a 115 to 485 pf
Range
Thanks !
No. Connecting in parallel will increase the capacitance, not reduced it. To reduce it, you can connect a disc capacitor in series with the original variable capacitor. Any additional component to a radio circuit to add or reduce capacitance or inductance will only decrease the original Q factor, not increase it. Imagine adding some liquid to pure water. the liquid will only add impurity, not make original water more pure.
Diagram whear
👍👍👍
Сколько не пытался повторить, ничего не работает. СВ детектор без проблем работает, а фм это наверное надо под передатчиком стоять. Даже с внешним усилителем звука тишина.
Видимо проблема в качественных пьезо наушниках.
@@Lechoslowianin они военные, на СВ и КВ все отлично слышно. Да и не понятно как работает ФМ на детекторе принимающем АМ
@@surdinkalol Наушники должны быть не менее 10 кОм. Приемник улавливает два сигнала и сдвигает один синфазно. Он должен работать
Надо подбирать детекторные диоды, не все работают на таких частотах
@@Mylo_Veryovkin всякие пробовал, много разных германиевых и советские свч, и даже рекомендованные из видео, видимо расстояние от вышки критично решает
Compratelo