Super Hearing Aid Amplifier

Product Description

Amplification Electronic Project Kit (Soldering Required)

The Velleman MK136 Super Stereo Ear Minikit is a stereo audio amplifier that is capable of making sound 50 times louder. This DIY minikit uses 2 on board microphones for the input and a headphone jack for the output. The kit also includes an on/off switch, and a potentiometer which can be used to adjust the volume. This mini amplifier is easy to build and useable as a hearing aid, a science project, a headphone add-on, or merely a fun DIY project. Exercise patience and caution when building this, and you'll find yourself with a neat working amplifier in no time!

Specifications

• Power supply: 3 1.5V AA batteries (not included)
• Dimensions: 2.4" x 2.1" x 1.7"

Features

• DIY – This kit is 100% DIY and a perfect project for those who are new to circuit design, hobby electronics, and sound technology.
• TRUE STEREO AMPLIFICATION – This build features two microphones that act as inputs to create a stereo signal, outputted through a standard 3.5mm headphone jack.
• FULLY FUNCTIONAL – You’ll produce a practical, usable piece of tech with this project: it includes an on/off switch and a potentiometer which can be used to adjust the volume.
• POWERFUL AMPLIFICATION: This build is capable of amplifying sound up to 50x louder. Perfect for a science project, a DIY hearing aid, headphone add-on, or just for fun.
• SPECS – Power Supply: 3 1.5V AA Batteries (not included). Dimensions: 2.4” x 2.1” x 1.7”.

Top Reviews

I started making good solid shiny joints
by Chad D. Prewett (4 out of 5 stars)
October 20, 2015

This was my 2nd ever soldering project. I completely ruined my first one while I learned to use a lower iron temp, and where to touch the solder to the joint/iron. But once I got the hang of it, I started making good solid shiny joints. So I set to work on this one, and as a total novice, I have to admit it was a lot of fun. I ended up with a functional result! I couldn't find any cheap earbuds around the house so I had to reluctantly test the headphone output with my nice Sennheiser HD280 Pro headphones. Fortunately I wired all of the capacitors in the correct polarity, so no fireworks, and it works well. It's surprisingly loud, there's a lot of gain in this little amp!

Minus a full star because my kit was missing one of the electrolytic capacitors, necessitating a trip to my local Radio Shack (yeah, I still have one in my neighborhood). It's not fun to get a kit that's missing a piece.
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Amazing little amplifier, easy to solder.
by IHeartArt (5 out of 5 stars)
January 18, 2017

Wow, just wow, this is one really cool kit! I purchased this for my husband who loves to put together electrical DIY kits and wasn't expecting much really. Overall the kit was easy to solder together, it took an hour or so. The kit comes in a clamshell packaging and instructions are included on the cardboard photo on the inside.

All components were in the kit, nothing missing, and all worked. What was actually shocking was how well this worked once we put batteries in it, you can hear some of the most faint sounds that you normally would not notice otherwise. The only thing it didn't seem to want to pick up was the TV audio which is what I was hoping for as I am a bit tone deaf, not sure if it was a distance thing so we are looking at putting a parabollic reflector on it to see if that helps, but otherwise if needed for just hearing conversations or even ambient sounds this will certainly do the trick.

Will be picking up a few more of these great kits for family members to use for hunting and outdoor guiding, they are that good!
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Nice Kit But Mine was Short One Capacitor
by Enginerd (4 out of 5 stars)
December 17, 2015

Nice kit. Doesn't take long to build and produces a nice clear sound. I'd have given it five stars but all of the capacitors were not included in the kit and I had to supply one 470uF capacitor from my stock. No big deal but I stock a lot of spare parts. It could be pretty frustrating if you only had the parts of the kit to use. The only other complaint is the schematic is so small.

I really like that this kit came with an on off switch. I've built similar kits that don't have a switch included and then it's a hassle trying to find where to mount one so you don't have to remove the battery all the time.
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Works as expected.
by Rick M. (4 out of 5 stars)
February 17, 2019

I liked building this project, it was fun. It overmodulates a little but works very well. You will get some good soldering practice and some knowledge on how a simple audio amplifier works if you do a little research on the TI NE5532P OP-AMP.
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Great stereo amp for the experimenter
by Cyberguy (5 out of 5 stars)
April 17, 2016

I have made several of these kits over a 10-year period. I'm an electronics and acoustics experimenter and these amps are great for listening to very quiet or distant sounds with very good fidelity and low noise. For some applications, I have mounted the microphones off the board, using short length of shielded cable. Use a good pair of earphones and you'll be amazed at what it can pick up. My grandkids like to play with the amp, roaming around the house with earphones and seeing what sounds (clocks, refrigerator, footsteps, breathing, etc.) they can hear.
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Works like a charm!
by Tony W. (5 out of 5 stars)
April 12, 2015

Very effective sound amplifier! When I first put this together, I had accidentally positioned the IC backwards, so when I went to power it on....nothing. But boy did the IC heat up something fierce. I quickly disconnected the batteries, used a set of needle-nose pliers to pull out the IC from its socket, let it cool down, and then reinserted it the correct way. Works perfectly now. Only took about an hour to assemble. Hardest parts were soldering the microphones to the PCB posts, and as what always seems to be the case with every Velleman kit, the battery holder final assembly. Not sure what I'm going to do with this, but it's a neat little toy.
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Good kit except the on/off switch is pretty cheap
by Charles Marsh (4 out of 5 stars)
January 12, 2018

Good kit except the on/off switch is pretty cheap, does not always turn on. Also you have to make sure the microphones cases are soldered to the connecting post (which is a little hard to do) or it will hum big time
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Great kit, excellent result.
by Marc Arndt (4 out of 5 stars)
October 31, 2016

Cool kit. Only my 2nd soldering project kit. First was that 3D Christmas tree. This was more involved but the end product is WAY more impressive. The only issue is the mic connections are a little dubious. But, it might pay to add some kind of extension, or alligator clips. Wind shielding would help outside. Real cool product, good instructions, fun build, great result. More of a 4.5 really.
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Fun kit, good value, soldering is a bit tricky in spots.
by JK (4 out of 5 stars)
January 10, 2016

Fun kit to put together. Traces lifted under one of the big caps, but I was able to glob-solder it down. Works pretty well once done. Kit came with a couple random extra pieces (buzzer/speaker and cable connector pins). Board layout has a lot of unrelated solder points really close to each other, so it's good practice for doing very neat, precise soldering, I guess.
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Very Happy
by Robert T. Sturtzen (5 out of 5 stars)
June 1, 2019

Sound quality is much better than expected, I thought it would be like my shooting head set but both amplification and sound quality is much better. Fairly easy to put together, good instructions

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