| Electronics > Beginners |
| Is this a working transmitter? |
| (1/2) > >> |
| SolderOcelot:
Reading about (crystal) oscilators gives me the confidence they're really simple and I could build a simple RF transmitter. However after looking at simple example circuits I see they jam them up with resistors, capacitors, transistors, paralel lines etc. It's driving me nuts. I drew this simple schematic. Shouldn't this be a simple working RF transmitter? |
| Benta:
I see a crystal but no oscillator. You might exchange the crystal for a resistor and ask: "Is this a working amplifier?" |
| HB9EVI:
:-DD just great that remembers me some voodoo devices you patch on the rear of your cellphone to change bad radiation to good radiation |
| SolderOcelot:
--- Quote from: Benta on November 25, 2018, 03:16:50 pm ---I see a crystal but no oscillator. You might exchange the crystal for a resistor and ask: "Is this a working amplifier?" --- End quote --- I thought the "crystal" is an oscilator. It takes in DC and outputs AC as I understood. Correct me if I'm wrong, I'm here to learn. --- Quote from: HB9EVI on November 25, 2018, 03:22:12 pm --- :-DD just great that remembers me some voodoo devices you patch on the rear of your cellphone to change bad radiation to good radiation --- End quote --- If you help me learn how to create a simple oscilation that goes through the antenna I promise to build you a voodoo device one day. |
| HB9EVI:
That's not so simple like you imagine. Basically an oscillator is an amplifier with a positive feedback, and yes, an amplifier needs DC to operate, but it can ampify DC and also AC signals if you already studied schemes of oscillators you see, that there are resistors, capacitors and transistors - they are needed. there is no amplifier without at least one transistor, but no transistor can work properly without resistors. Capacitors are needed to generate the necessary phase shift to turn the amplifier into an oscillator. check once for 'pierce oscillator' |
| Navigation |
| Message Index |
| Next page |