Please read the description first. Everything is told in the video, so I don’t have to elaborate more. About that LM 386 audio amp. + Shortwave Radio reception via a computer (SDR=Software Defined Radio). Much more videos about SDR? Links in the final lines of this description.
Second video (30 sep 2024) about that LM 386 Chip is here • LM 386 as audio amp. 0,5 Watt, connec...
The LM 386 (max. 500 Milliwatt audio loudspeaker out) is used here as an amplifier, where its input is connected to the headphone output of a computer. Via a 10 K or 50 K potentiometer (volume control). And a separation capacitor of 220 N (=0,22 uF).
That computer is receiving Shortwave Radio, via a computer program working under LINUX and a “dongle”.
That dongle is connected to a converter. Such a converter translates (up-mixing, in this case, can be bought via Ali) the standard SW frequencies (going from 500 KC-30 MC) to a higher frequency, received by the dongle. That dongle sends that frequency to the SDR Computer program, via which the SW radio stations are visible/audible.
There are many programs + schematics on the www. to do that job, here a LINUX SDR (Software Defined Radio) application is used, to detect the different radio stations on SW.
All kinds of “modes” can (via the computer program) be switched in: USB/LSB/AM, different widths of the IF filters can be set, etc, etc.
Much more info is on the www, search term: “software defined radio”. So for (say) 60 Dollars or Euro’s (and an old or modern computer) you have a SW receiver that, in the 1980’s, could cost 1000 Dollars or (much) more…. It is easy nowadays….. (2024).
Though the focus is now, here, completely on that LM 386 (max 0,5 Watt audio out) amplifier.
When it is not driven “fierce” at its input, the audio out will not be very crafty.
But in this case: that is surely no problem. Reason: the headphone output of a computer gives out a fierce signal, because it has to drive a headphone, with (say) a nominal (DC) resistance in the order of 8 Ohms to 32 Ohms, perhaps even 60 Ohms or so at (say) 300 MilliWatt.
Such a signal is very fierce and more than enough to drive that (quite simple) LM 386 Audio amp completely “out”. Even to its distortion level in the order of 0.5 Watt audio out.
Never (!) use a “computer” power supply for this LM 386 amplifier (say 5-9 Volts), its audio out signal (thus: what you hear) will drown in the noise, rattle, etc.
A classical (50 Hertz or 60 Hertz) well stabilized and hum-free power supply must do the job here. When I have time I will show schematics of good usable setups.
My You Tube channel trailer is here: • Radiofun232 on YouTube. Updated month...
When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.
Direct link (5 nov 2024) is here https://www.lulu.com/search?adult_aud...
Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 29 september 2024.
More info about SDR Radio reception is in these video’s:
Video link
• Software Defined Radio (SDR) receptio...
Video link
• Receiving radio signals on Shortwave ...
Video link SCHEMATIC of the active antenna for Shortwave
Made with a BC 547b + coil + a tuning capacitor (demonstrated here/now, 29 sep. 2024)
• 1 transistor Active antenna/HF Preamp...
About “modern” radio reception on Shortwave, via SDR:
• Modern radio reception goes via SDR (...
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