Simple FM transmitter built using a 2N3904 transistor, LC tank circuit & BB105 varactor tuning. A great example of how oscillation, resonance, and RF amplification work together. Small circuit, powerful electronics concepts.
What component here acts as the heart of oscillation?
Confused between NPN and PNP transistors outputs?
Here’s the simplest way to understand Sinking vs Sourcing PLC signals.
Save this guide for troubleshooting sensors, PLC inputs, and industrial wiring.