This gave me the idea to build a small homemade spring reverb!
But how does it SOUND!?!?!
Glad you asked. Like this. (soundcloud link)
Step 1: What You'll Need
- echo mic toy ($2)
- little amp & speaker (I got mine from a 1-watt Marshall amp I had laying around) ($35 for the Marshall one I believe)
(you could of course use something more DIY like a little Kemo amp for example. Make sure your speaker fits the specifications of the amp)
(You might want to get an amplifier for after the piezo mic as well. I don't have it- I just use the instrument inputs on my sound card and it works fine. But in situations where you don't have gain, it might be useful.)
- In the case of the Marshall MS-2, an extra 9v battery connector ($0.5)
- jack socket (you might need two if you're working with a more DIY amp.) ($0.5)
- a box in which it will all fit. So speaker, amp, spring, etc. will have to co-exist in this space. My box was around 18x13x7 cm.
(make sure the box can close with everything in it. Mine can't fully. It's no biggie tho. ($0)
- 9v battery to power amp
- piezo element ($1)
- 2 small paperclips/metal hooks/thingies to glue to speaker/piezo so you can attach the spring.
- Soldering iron!
- Glue gun!
Step 2: Saw open the mic, get that spring!
I used a saw for this and just sawed along the side until I could get to the insides.
The spring might be stuck inside, but with some force on the outsides of the mic, you should be able to get one side to detach.
The other side however, is a bit tricker.
I used a pen and a paperclip to kind of "fish" the other end out.
FInally, you'll have a detached spring! :)