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thebugger
modified 10 years ago

Class C Power Amplifier

8
17
297
03:33:48
A typical class C power amplifier stage. Nothing fancy with <2W of power (which is still illegal). The output is completely cleared of any harmonics so the resulting transmission will be very clear and will not interfere with other stations, as long as the antenna is tuned to have a 50ohm impedance. Enjoy :) - Input Sensitivity - 1V/20mW (makes it possible to use these little car FM transmitters for the input of the power amplifier) - Output Power - 1.6W - THD - 0.5% (4mWrms from the Total) - Range - Depends on terrain and antenna but best case scenario is 5-10km.
published 10 years ago
jason9
10 years ago
I was hoping for something more like an FM receiver.
faceblast
10 years ago
THD thd
WTFCircuit
10 years ago
FM recivers are quite complicate
jason9
10 years ago
I'm hoping thebugger will manage it.
thebugger
10 years ago
I already answered you. FM receivers are hard to simulate in EC. Hard due to the enormous carrier and modulating signal frequency difference. AM receivers on the other hand are very simple and i believe there are numerous circuits here with both AM transmitters and AM receivers (most of which are mine because i find AM fascinating). I even posted a while back a stereo implementation of an AM transmitter. Or rather a more efficient use of the AM band. I'm sorry FM receivers are out of reach. Just google FM receiver circuit, or FM receiving IC. There are a few IC's out there that offer an awesome job, with only a few external components. P.S. Faceblast, i haven't measured the THD yet but, now that you mention it, i will.
jason9
10 years ago
Just make the modulator signal 1MHz or so instead of a few KHz. The FM transmitter can be a VCO. A 555 will work with the control pin as frequency control.
jason9
10 years ago
By the way I asked you a question on your newest AM circuit which I love.
thebugger
10 years ago
I measured the harmonic residue and it turns out that the combined power of all the harmonics is 4mWrms. This means that the output is extremely clean.
thebugger
10 years ago
Haven't seen the question. Will look it up now. A 555 won't make a viable FM transmitter/receiver because it's maximum frequency is 1Mhz. If you want to see a cool representation of the FM idea, okay do your 555 thingy, but if you want a viable working circuit, that's not the way to go.
jason9
10 years ago
I don't need a working in real life circuit, I just need a working in simulation circuit.
jason9
10 years ago
I want a realistic receiver, but I don't care about an unrealistic transmitter.
thebugger
10 years ago
Just scout the web, this is next to impossible to do here in EC.
jason9
10 years ago
1-10Mhz modulation, unrealistic transmitter. That should make it easier.
jason9
10 years ago
If you insist that you just can't do it, then you can just make a receiver with input manually modulated.
jason9
10 years ago
By the way I commented your "super low distortion preamplifier" circuit. The one for your Ultimate Hi-Fi Class B Amplifier V3.2.
jason9
10 years ago
Not the "super low THD preamplifier".
thebugger
10 years ago
Listen with 1-10Mhz modulation the deviation will be too great and the filtering will probably not be able to work under such conditions. I'll try, but i don't guarantee anything

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