Radio Shack 273-066 Piezo Buzzer

Passive, easy intall.

I installed on the guitar, dobro and Mandolin.

On the guitar and the dobro it didn't compare to a magnetic soundhole pickup and certainly not even close to an undersadle piezo. All mids, no dynamics, and it's HYPER SENSITIVE.
Feedback is a problem if you plan on using monitors.
You will need to run it through some sort of pre-amp system or EQ pedal.

As I mentioned earlier, it's HYPER SENSITIVE. Just the sound of the back of the guitar barely brushing against your shirt is easily picked up for amplification and it's really annoying. So if you intend to play your guitar without it resting against your stomach, resting it on your knee, or touching any other part of your body - this works out great for you. You'll look like a dork on stage playing that way, but hey it's only a few bucks!
HOWEVER, on my mandolin it sounded FANTASTIC!!! 10 times better than the magnetic pickup I presently use in it. If you play mandolin seated and don't plan to move around much (mandolin players seldom do), this is a good buy. Make sure your soldering skills are up to par.

Pickup features: Piezo Buzzer
Impedence or other specs: sound level 81dB(min) at 30cm ---- Not sure what that all means, but it sound good.

Model of guitar or bass: Cheap guitar mada into a Dobro
Position: bridge
Pickup being replaced: non
Other pickups on guitar: non
Artists using this pickup: Lots
You musical style(s): Pink Floyed
Reason for pickup change: Something new to try !
-And to test if this Piezo Buzzer really works.
It Does !

Perceived output level: normal - I think for a piezo pickup.
Tone: Brassy, Not bassy, - Great for Dobro
Sonic evaluation: I run the line out into my DigiTech RP80 $150.00 Canadian new. Then into my Behringer mixer to my computer.
Running it into my DigiTech is great because the RP80 has pickup modeling. The RP80 has single & humbucker pickup modeling . Which is worth the $150.00 price in its self. Plus you get all the amp models.
The Radio Shack piezo run direct into a mixer or amp is OK sounding, but not great. - As with any piezo pickup.
Running the piezo into a guitar processer is the way to go for great sound. Like I mean WOW ! It sounds totally awesome. I've been recording guitar for over 20 years, and I know what a bad sounding recorded guitar sounds like. This pickup sounds great when recorded. I have nothing but good things to say about it.

For which styles and positions is this pickup (un)suitable: Pink Floyed style of music.

Comments: I'm going to buy more for all my guitars. It sounds great running into my DigiTech RP80. The price is right ! Can't go wrong for $8.00

Pickup features: Passive ceramic transducer; not really intended for musical instruments
Impedence or other specs: Duh???

Model of guitar or bass: Yamaha F-310
Position: bridge
Pickup being replaced: none
Other pickups on guitar: none
Artists using this pickup: Mr. Ezell (the guy below)
You musical style(s): Rock, Metal, Jazz and Fusion. Not much acoustic .
Reason for pickup change:

Perceived output level: HOT!!!
Tone: When plugged direct w/o EQ and/or preamp, sounds nasal
Sonic evaluation: First off, I wanna make it clear that ON ITS OWN (without a preamp and/or EQ), it sounds very nasal and lacks high end and bass. On the plus side, IT HAS VERY HIGH OUTPUT, and probably beats or if not, pars with the most popular acoustic guitar passive transducer pickups in the market!
For this reason, I tried to hook it to my Danelectro Fish & Chips EQ pedal (primarily designed for electric guitar), and after continuous experimentation I finally found the right settings on my Fish & Chips:
+8 dB at 100 Hz;
-15dB at 200 Hz and 400 Hz;
-8dB at 800 Hz and 1.6 KHz;
0 dB at 3.2 KHz,and
+15dB at 6.4KHz.
LEVEL - (adjusted to increase/decrease volume)
With these EQ settings, you can get rid of the boom and increase the treble. In addition, in case you send this direct to the PA, you can ask the sound tech to add more presence by having a high-shelving EQ from 7KHz and up by +6dB - +12dB to get more air. I myself couldn't believe it! It sounds so natural, unlike most transducer pickups that sounds so plastic-like and churpy. I even tried recording it direct to my PC and compare it to my condenser-miked acoustic guitar tracks, AND THEY COME CLOSE WITH A LITTLE EQ!
Careful... Note that this pickup can easily cause distortion due to its innate high output. Twiddle with the volume on your preamp or effects carefully.
I haven't tried using it with an acoustic preamp yet, but to come to think of it, while it performs very well using my very simple and economical setup (i.e. just a Dano EQ in between), I can imagine getting holy grail acoustic tone with a nice preamp like a Para Acoustic DI from LR Baggs or something.
Prior to mounting the transducer, I tried finding the best spot on the soundboard by sticking the disc on different parts of the soundboard using bandage tape, and it turned out that it sounded best on the bass side of the bridge. Afterwhich, I installed it on the underside of the bridge on the very same spot.

For which styles and positions is this pickup (un)suitable: For acoustic, it outperforms other more known brands.

Comments: If it got stolen, that means my guitar stolen too, and that is not a very good thought. As for the pickup on its own,
I would be happy to install one for each and every friend with an acoustic for free!
You can look into other acoustic guitar transducer pickups that can perform better, only that you have to pay
times twenty. But for the price, this is a steal!

Pickup features: Passive Piezo SoundBoard Contact Pickup
Impedence or other specs: Unknown

Model of guitar or bass: Epiphone
Position: bridge
Pickup being replaced: Shadow
Other pickups on guitar: None
Artists using this pickup: Don't Know
You musical style(s): Contemporary Christian ,Country ,Bluegrass ,Blues and Rock
Reason for pickup change: Not enough output from the Shadow

Perceived output level: As much output as you could want the piezo element in this buzzer is of a larger diameter so it picks up more of the soundboard's vibrations I glued it directly to the underside of the Bridge Plate.
Tone: The tone was a little on the trebly side but by turning the treble on my amp down and turning the bass and midrange up a little I am getting a good tone with no feedback except at high volumes and then only if I get too close to the amp.
Sonic evaluation: I'm using a Peavey Heritage which is a 130 Watt output amp and a Zoom Acoustic Pedal.

For which styles and positions is this pickup (un)suitable: As I indicated earlier I play a big variety of music and its suitable for all of it.

Comments: If someone stole it I would definitely build one again for I've found that sometimes I can build and repair things for very little money that sounds as good as high priced Brand name stuff.