This is an FM transmitter that I built. I wanted to interface it with a microcontroller.
The enable connection seems to work, but the range is extremely weak (about one inch), even when running off of a 9V battery.
I know I didn't show it in the circuit, but I connected a 22uF capacitor across the 9V battery.
The antenna length I used is 3 inches.
I selected a low value for the grounded base capacitor (470pF) because I wanted to filter out the mains frequency and allow the tone from the 555 to go through.
I do apologize but the bottom transistor is actually 2N3904 and the top one is PN3563, and I used PN3563 for the transmitter because I'm transmitting at a high frequency.
Is there any way I can increase the range without requiring the battery to drain quickly and without requiring a higher voltage source? Do I need different transistors?
What am I doing wrong?