![]() ![]() The slightly moderate variations in the amplitude make a loop that shows the frequencies in the sound signal. Moreover, the amplitude of the carrier wave isn’t steady. It is about 550kHz to 1600kHz versus 20Hz to 20kHz. The base frequency of the electromagnetic radio wave is a lot higher than the frequency of the sound data it conveys. All the required components of this circuit are easily accessible in the market. Moreover, the circuit is not utilizing many additional parts or components to make a good quality AM receiver. Yet it isn’t utilizing a crystal, it is utilizing a high gain pre-amplifier phase of transistor BC 549 and BC 548. The circuit diagram referenced here is additionally a basic AM radio circuit. In our previous articles, we talked about a basic crystal radio receiver circuit. Use a diode detector (as per link) to produce the demodulated waveforms.For a detailed description of pinout, dimension features, and specifications download the datasheet of BC549 AM Radio Circuit Working Explanation WWV uses up to 100% modulated AM (or normal DSB) transmission. Honestly couldn't find a difference between normal AM signals and AM Sub-carrier? Does an LC->RC circuit even work for dual-side-band? (I Would I run the output into another LC->RC circuit tuned to get the.See design linked to for best guess at what you should be aiming for. ![]() Would amplification between any step be useful for final input on myĪrduino? (Antenna->LC->RC->output->Arduino).I'm guessing this is tied to the output voltage or current of the.Try for a resonant circuit that uses no less than 50pF - 50pF and 5060nH resonate at 10MHz - if you half C, double L for same resonance at an improvement in Q of 2:1. NO, you need to tailor the inductance capacitance ratio to give a decent Q factor but not be susceptible to parasitic components. Can any inductor/capacitor combo be used that meets the LC resonanceįrequency equation? (C=100nF, L=50.3uH, should resonate at 10Mhz).A quarter wave dipole at 10MHz is optimum but this will be 7.5m long so try a couple of metres. YES but it's probably not too critical if you are receiving a decent signal. Does an LC->Envelope circuit even work for dual-side-band? (I honestly couldn't find a difference between normal AM signals and AM DSB)īonus: Is there any good free simulation software? (I can't seem to get circuitlab to output any useful simulation graphs, unlike Falstad's "View in Scope" or scope-probe)Ī lot of questions but if you are looking for a WWV receiver design here is one and below is one of the circuits contained on the link:.Would I run the output into another LC->RC circuit tuned to get the sub-carrier?.Would amplification between any step be useful for final input on my Arduino? (Antenna->LC->Envelope->output->Arduino).I'm guessing this is tied to the output voltage or current of the antenna.Can any inductor/capacitor combo be used that meets the LC resonance frequency equation? (C=100nF, L=50.3uH, should resonate at 10Mhz).Do I need any special length for my antenna?.What I do not know - Links & explanations greatly appreciated! There is a 100Hz "subcarrier" that continuously broadcasts "date" information (Year, month, day, hour, minute, and DST to name a few).The carrier wave is put through an RC circuit ( parallel low pass?) Envelope detector to demodulate it into the output to decode on my Arduino.I've solved the LC equation for both the capacitor and inductor using wolframalpha.This "filters" out the unwanted frequencies. The signal is received on an antenna and frequency resonated on an LC circuit tuned to 10Mhz.High fidelity - I'm fairly certain that I can program around noise on my Arduino.Reducible components such as op-amps and 555 timers kinda scare me.Made of simple and irreducible components.A very simple AM (DSB) receiver - eventually for the NIST WWV station.(Tomorrow I'm going to try this with a 555 timer instead of common emitter AC amplifier) What I'm looking for ![]() I'm trying to building a transmitter so I can virtually demodulate it in the simulator. Even when I build one from several sources it gives a similar odd signal. I'm trying to prototype in a circuit simulator and it seems that there is a bug with transistors. I've read a vast amount of information on this topic. ![]()
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