Let's build a simple FM transmitter

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This simple little FM transmitter from eBay for the incredibly low price of $1.69 is more powerful than one would expect. Range is up to 500m with a 9V battery and a quarter wavelength antenna wire.
eBay links are always changing, search for "FM transmitter module wireless microphone", sort for "buy now" and "lowest price" to find it.
The frequency is adjustable and pretty stable due to an additional amplifier section. Audio quality is very good!
Only very basic soldering skills are needed to get this up and running!

Опубликовано:

15 сен 2024

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Комментарии : 20

@joelongstaff7601 2 года назад

Hello, great video thankyou. I am wanting to have to run lights from the fm signal. Do you think I could remove the mic and add a mp3 to the board. Thankyou and keep well.

@jackzeid5287 3 года назад

What antenna do I use?

@tomtechtod9200 3 года назад

Simple quarter wavelength wire works ok

@relaxmusic8197 3 года назад

What app can i use for this i cant find any:/

@tomtechtod9200 3 года назад

Check first if your cel has an FM receiver. Then download an FM radio app from playstore (for Android). Or just use a common FM receiver

@dream6942 4 года назад

What is the range man..???

@tomtechtod9200 4 года назад

Can't remember, it's been a while . But it was pretty good, certainly several 100s of meters with the right antenna

@dream6942 4 года назад

@@tomtechtod9200 ok thanks man 🤟 good video

@abelgirequispe8334 6 лет назад

friend a favor could you send me the schematic. please

@tomtechtod9200 6 лет назад

it's in the video at 1 minute ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3djLxDSxp80.html

@sarachen5250 6 лет назад

Hey, do you mind explaining what batteries you used for this and how to recharge it?

@tomtechtod9200 6 лет назад

It's a 9V battery which are usually not rechargeable. Voltage can be lower with decreased range. You could use any rechargeable battery with a commonly available charger below 9V. Don't remember what the minimum voltage was, guess it still works with 3V

@sarachen5250 6 лет назад

Thank you Is www.ebay.com/p/10x-Pp3-Mn1604-9v-Battery-Holder-Clip-Snap-on-Connector-Cable-Lead-Black-PS/1453057256 is the battery and holder? Or which 9V battery thats not rechargeable are you using? And how long would the battery last? Thank you again!

@tomtechtod9200 6 лет назад

The link you posted is only for the battery holder. The normal 9V batteries you buy about anywhere (alkaline) are not rechargeable. There are 9V batteries that are rechargeable in the same format, they have actually 8.4V. At 9V the current is pretty high, it's gonna last only a couple of hours. Go lower in voltage with AA or AAA batteries and it's gonna last longer

@drvitorprado 7 лет назад

Bom dia, TOM , com esta placa, eu conseguiria regular até 400-468 MHz? Ou poderia adaptar para isto? Obrigado!

@tomtechtod9200 7 лет назад

Os transistores Q2 e Q3 tem uma freqüência de transição de 800MHz, não sei se vai funcionar até 450MHz. Claro que vc poderia tentar usar outros transistores com mesmo encapsulamento, depende o que é disponivel onde vc mora. Tb pode diminuir os valores do circuito resonante (C10, C15, L2). Tb tem outros circuitos que pode explorar, como esse aqui : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u4GYdkeRFrc.html ou ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8hJL4i8nWKA.html

@tomtechtod9200 7 лет назад

Tb , se é pra caber dentro de um celular vc vai precisar fazer seu proprio PCB, normalmente o espaço disponivel é bem limitado