In this post we will see how to make 100mhz FM Transmitter using Bc547 Transistor. The FM Transmitter is built using a crystal oscillator without the use of a winding coil. This circuit can operate at a constant 100Mhz Frequency.
FM Transmitter Circuit diagram :
circuit designed easy eda site
Components Needed :
- BC547 Transistor – 1no
- 68pf Capacitor – 1no
- 33k Resistor – 1no
- 47k Resistor – 1no
- 1k Resistor – 1no
- 20mhz Crystal oscillator – 1no
Tools Needed :
- Soldering iron
- soldering Iron stand
- lead
- past
I requested in a comment under your YouTube video for an explanation on how the signal gets bumped to 100mhz using a 20mhz oscillator. I’m also wondering if the antenna is tuned to 100mhz or more broadband to receive all FM frequencies?
All transmitters broadcast on their harmonics… so the 20MHz crystal will broadcast at 20, 40, 60, 80, 100, 120, 140, etc… you get the idea. After some harmonics, the signal becomes weaker. The best way to handle this is to use band-pass filters to limit the broadcast to any frequency of choice.
Hello,
how can I make a 120hz transmitter to scare away pigeons, would you have any suggestions?
Thanks.
Ademir (Campinas-SP-Brazil)
Hello! What happens if I put a different ceramic value, for example 10000pf?