OpAmps Project: Build an Amplified Stereo Mic Kit - The Learning Circuit
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- Опубликовано: 24 мар 2020
- In the previous lesson, Karen talked about how op amps work and the many ways they can be used. In this episode, Karen assembles the Velleman MK136, Super Stereo Ear Kit. This kit uses a NE5532 Op Amp to boost the audio input from two onboard microphones to an audio output jack. While a speaker is not included in the kit, there is a potentiometer that acts as a volume control. Follow along as Karen walks you through soldering the kit together and then see it in action! bit.ly/39jYcJQ
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Oh how I envy you for that keysight scope - it's like when computer manufacturers noticed that beige isn't the only color a case can have. Great episode! :)
I've made a few of these for people who have slight hearing loss, they're definitely designed with headphones in mind. Very sensitive when cranked up, more so than some handheld recorders with similar condenser mics. Thanks for the video!
I love this thing, I put it ( or a similar model ) together a few years ago. I ended up botching the part where you attach the mics, but it was still an excellent experience.
You've sparked my interest. I can hardly wait to see how you amplify the circuit.
Pretty cool video . Loved it . Soo professional and love watching it .
Awesome video as always Karen! You always make your videos very educational and fun. Thanks for all the info! I hope you are staying safe and healthy in your part of the world :)
Thanks for the video.
Very nice!
I wish you uploaded a pdf with the diagram circuit of the amplifier you built...
Nice video/project. Thank you. Opamps are cool in audio projects -- I have used NE5532 IC's in graphic equalizers and in phono pre-amp stage for instance.
Well, my use would come out of I am building pickups and pre-amps for the acoustic stringed instruments I make in my workshop. Hence, I'd maybe use it as a transducer with the Electret Mics positioned at distinct & ideal locations under the soundboard of an instrument. I might use only one of the two op-amps on the 5532p IC for Mic and the other for a piezo transducer and that might require a bit of modification in the feedback aspect of the op-amp that boosts the piezo transducer.
Great as always, but 10:48 isn't it millivolts not megavolts? amplification of 1V/mV meaning gain of 1000?
Whoops! Sometimes words come out of my mouth and I don't even know what I just said. HA! You're right. Nice catch.
NICE 👍
Nice
If I don’t have a zero ohm resistor, what can I use as a jumper? In my guitar pedal, there is a spot for a J snuggled right next to the op amp socket.
Say I wanted to run this circuit on 6V 4X aa bateries instead of the supplied 4.5V 3X aa batteries then would the values of R1 and R2 (I presume microphone Bias resistors) need changing?
If so what value would they need to be? most electret microphone capsules require 2V - 3V @ 0.5mA and in this circuit I dont understand how the provided R1 and R2 bias resistors @ 10k are providing the required 2V - 3V @ 0.5mA to the microphones.
I don't mean to act like a smart a** but you scared me when you said MegaVolt instead of milliVolt while reading the datasheet :)) other than that, I enjoyed it :D
I want learn to how mobile board designed and how to find repair in mobile.How to find which ic is used for which purpose in board.eg Bluetooth ic.tell me any suggestion or website for learning.
think it possible to attach wire to the mics and run them else were? like in a helmet?
Thanks a lot. .If you please I need to design a circuit to transmit analog signal approximate 800 meters wirelessly
I’ve tried this build twice and both times I only get input from my right headphone. I’ve double checked my polarities and nothing is wrong. Any thoughts please? I’m at my wits end with this thing
how can i get a long input but a short output like i press a button and get a 5 to 10 ms output
I am trying to add a wire between the mic and board so I can have the mics father from the board, but I keep getting a hum instead of sound. Problem absent if directly connected to the board. I've tried shielded cabling but the hum just got lower.
the cable is acting as an antenna, the hum will have 50/60Hz depending on your reagion, it picks up the AC voltage in the mains wiring around the house.(if you are near a flourescent lamp this gets worse) .Dont' elongate the wire between mic and board but only the finished amplified signal. the stronger signal is much less prone to inducted noise when transported over a shielded cable.
@@MAYERMAKES thanks for the reply. The whole thing is I want to have the mics off board so I can put them in different places for a project that the board may not fit
It's like the polar opposite of a Big Clive video.
Good)
Could you provide a music playlist reference ? Please
Hi Karen
Can you share this circuit.
Play doesn't seem to be follow an order
Ha ha. At 10:45, mV is milli Volt not MV which is Mega Volt.
And she is back...
I have one of these hooked up to a stethoscope
do you speak or understand spanish?
where is all the smoke going
Send the pdf. File for PCB very good video
Do you have it
10:35 you are very pretty and cool honey :)
All in one audio circuit made amplifier 500 waatts
I am first
Great