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Accessing the FM 19kHz Pilot?

I set the oscilloscope to 50us/division (20kHz) and attached the oscilloscope probe to the speaker output of an FM radio based on the QN8035 FM tuner, that I had hard-wired to monomode (solder joint ...
James Bowery's user avatar
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How exactly does RF to IF conversion work in an AM radio?

The key to this type of RF frequency conversion is the mixer as is shown in the diagrams by Ale..chenski and the diode (which is functioning as a mixer) in glen_geek's diagram. Unlike most elements in ...
SteveSh's user avatar
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How exactly does RF to IF conversion work in an AM radio?

However, how is AM RF converted into a lower IF? The heterodyne principle can be used with a diode in this simplified mixer, reduced to its bare bones: simulate this circuit – Schematic ...
glen_geek's user avatar
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How exactly does RF to IF conversion work in an AM radio?

how is AM RF converted into a lower IF? It is called "superhetherodyne" conversion. For details, it is all explained in Wikipedia.
Ale..chenski's user avatar
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1 vote
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P2P communication: maximum range for low power & low bandwidth

You read about LoRa, so I'd guess you already stumbled upon the answer: faced with the problem that a low-power transmitter can't get data reliably across a channel of large distance, you reduce the ...
Marcus Müller's user avatar
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Why do my 433 MHz receiver and transmitter modules not work reliably?

What I see in the picture of modules with soldered antennas is that you shorted the antenna input of your receiver to the ground. In the previous photo of those modules without antennas (photo has ...
Konstantin's user avatar
1 vote

Audio engineering: amplifying two different sources

I would start with the output requirements, the available power supply, the efficiency requirements, then go back towards the signal sources, as follows: Step 1. What type of load are you driving, and ...
Fabio Barone's user avatar
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2 votes

Audio engineering: amplifying two different sources

Given the fidelity of your signal sources, consider the LM386 or some other integrated audio power amplifier for the output stage. It runs on a single DC voltage. With a little attention to power ...
AnalogKid's user avatar
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2 votes

Audio engineering: amplifying two different sources

Any normal device would simply amplify (or attenuate if necessary) all sources to a common level before user volume controls and the speaker amp. A record player would have a RIAA pre-amp with the ...
Justme's user avatar
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