I just saw this Simple RF Transmitter circuit on CircuitsToday
Here are some of the things I didn't understand:
1. Why is Capacitor C3 (2.2nF) connected to Ground? Wouldn't the input AC signal go straight to the ground as capacitor acts as short for AC (not exactly). Is there a need of that Capacitor?
2. On what parameters does the value of Capacitor C6 (10pF) depend? Can I just take any other value?
3. It's mentioned that the circuit is for FM Transmitter. But I don't see any block that can perform Frequency Modulation to that signal. Or should I apply an FM signal to Audio IN instead?
4. If I use any Digital Signal (Square Wave) will the output at Antenna be a Square Wave or a Sine wave? If Sine wave, is it the Tank circuit that produces it? If it is a Square wave, will it still propagate through the Antenna into the surrounding?
5. If my Square wave is of, say, 1KHz, then if I want an output of 30MHz at antenna, should I adjust my Square wave or the Tank Circuit values?
I'm a beginner in Analog Electronics and have basic knowledge of Modulation. But these stuff are pretty hard to understand.
All I wanna make is a Transmitter that can Transmit digital data. The Frequency can be anything, but I would even prefer the standard values like 27MHz
Here are some of the things I didn't understand:
1. Why is Capacitor C3 (2.2nF) connected to Ground? Wouldn't the input AC signal go straight to the ground as capacitor acts as short for AC (not exactly). Is there a need of that Capacitor?
2. On what parameters does the value of Capacitor C6 (10pF) depend? Can I just take any other value?
3. It's mentioned that the circuit is for FM Transmitter. But I don't see any block that can perform Frequency Modulation to that signal. Or should I apply an FM signal to Audio IN instead?
4. If I use any Digital Signal (Square Wave) will the output at Antenna be a Square Wave or a Sine wave? If Sine wave, is it the Tank circuit that produces it? If it is a Square wave, will it still propagate through the Antenna into the surrounding?
5. If my Square wave is of, say, 1KHz, then if I want an output of 30MHz at antenna, should I adjust my Square wave or the Tank Circuit values?
I'm a beginner in Analog Electronics and have basic knowledge of Modulation. But these stuff are pretty hard to understand.
All I wanna make is a Transmitter that can Transmit digital data. The Frequency can be anything, but I would even prefer the standard values like 27MHz