For those of you who didn't know, the LM386's frequency response goes up to 300,000 hertz, so if you're building a longwave broadcast band radio receiver, you could use an LM386 chip to amplify the RF waves. I found this out when I hooked a long wire into the input of my LM386 and 1.544 MHz oscillator crystal and heard LORAN-C (a 100 kHz radio station) on 1540 Khz AM.
you need a power regulator.. see how the LED becomes more dim as the op-amps output increases? Regulate the power supply and add a bypass capacitor (100uf)
The speakers were originally passive, meant to be powered by an external stereo amplifier. I built two small amplifiers from scratch (based on the LM386 Op-Amp) and mounted them inside the speaker housings. I then added a 1/4" audio-in jack, an on/switch, a volume control, and a volume-controlled LED to indicate power usage.
There's an unintended feedback loop that I left unchanged because it makes a pretty neat sawtooth wave type sound.
I also "electrified" the kalimba by mounting a piezo pickup inside, underneath the bridge and epoxied a 1/4" jack output in a hole drilled in the side of the gourd.
you know what would be a cool video, a how to video on a diy amp for complete noobs. that would be awesome and would be eternally grateful if you do make one.
After I made these, I was kicking myself for not taking video throughout the process to document it more thoroughly. Next project, I am definitely recording the whole process and making a how-to.
I like your style! You may like my circuit bent kalimba with internal amp and spaeker. happy hacking ,hotwater
hotwaterspa 7 months ago
the schematic????
404BassHunter 1 year ago
SEE MY AMP:
youtube.com/watch?v=YHfoON7ukSc
pegasomarcelo 1 year ago
I love the speakers- the other thing is odd lol - :)
jsmythib 2 years ago
Cool dude. Are all the notes supposed to be flat?
lunarrn 2 years ago
hahaha it sounds like its farting
coondogtheman1234 3 years ago
Whoops, that last post should of said "heard LORAN-C on 1444 kHz AM.
Amishman35 3 years ago
For those of you who didn't know, the LM386's frequency response goes up to 300,000 hertz, so if you're building a longwave broadcast band radio receiver, you could use an LM386 chip to amplify the RF waves. I found this out when I hooked a long wire into the input of my LM386 and 1.544 MHz oscillator crystal and heard LORAN-C (a 100 kHz radio station) on 1540 Khz AM.
Amishman35 3 years ago
This has been flagged as spam show
check out my vid, im recieving a signal in the 1500KHz range
Not trying to spam
smartpartzzkidd 2 years ago
you need a power regulator.. see how the LED becomes more dim as the op-amps output increases? Regulate the power supply and add a bypass capacitor (100uf)
Jimmypage512 4 years ago
This comment has received too many negative votes show
haha, you have feedback in your circuit if there is nothing connected-throw the shitty thing away and learn to build a better one!
Wichtelchen2006 5 years ago
It's called self-oscillation, dude. And it was part of the design.
michaeluna 5 years ago
ahahahah COOL!!
mrbak 5 years ago
the electric kalimba is cool, i have no idea what you did to the speakers tho?
stonedfenix 5 years ago
The speakers were originally passive, meant to be powered by an external stereo amplifier. I built two small amplifiers from scratch (based on the LM386 Op-Amp) and mounted them inside the speaker housings. I then added a 1/4" audio-in jack, an on/switch, a volume control, and a volume-controlled LED to indicate power usage.
There's an unintended feedback loop that I left unchanged because it makes a pretty neat sawtooth wave type sound.
michaeluna 5 years ago
I also "electrified" the kalimba by mounting a piezo pickup inside, underneath the bridge and epoxied a 1/4" jack output in a hole drilled in the side of the gourd.
michaeluna 5 years ago
you know what would be a cool video, a how to video on a diy amp for complete noobs. that would be awesome and would be eternally grateful if you do make one.
stonedfenix 5 years ago
After I made these, I was kicking myself for not taking video throughout the process to document it more thoroughly. Next project, I am definitely recording the whole process and making a how-to.
michaeluna 5 years ago