_           _ _     _                                               
| |__  _   _(_) | __| |  _   _  ___  _   _ _ __    _____      ___ __ 
| '_ \| | | | | |/ _` | | | | |/ _ \| | | | '__|  / _ \ \ /\ / / '_ \
| |_) | |_| | | | (_| | | |_| | (_) | |_| | |    | (_) \ V  V /| | | |
|_.__/ \__,_|_|_|\__,_|  \__, |\___/ \__,_|_|     \___/ \_/\_/ |_| |_|
                         |___/                                       
                   _                  ___   _  _  _  _ _    o       o              
  __ _ _ __   __ _| | ___   __ _     /   \ / \  \  \  \ \  __            
 / _` | '_ \ / _` | |/ _ \ / _` |   /    /   /  /  /  / / /  \                     
| (_| | | | | (_| | | (_) | (_| |        \__/ \/ \/ \/_/_/    \__/              
 \__,_|_| |_|\__,_|_|\___/ \__, |  o     o                                        
                           |___/                 o   o      o      o                 
                _                                       _            
 ___ _ __  _ __(_)_ __   __ _   _ __ _____   _____ _ __| |__         
/ __| '_ \| '__| | '_ \ / _` | | '__/ _ \ \ / / _ \ '__| '_ \        
\__ \ |_) | |  | | | | | (_| | | | |  __/\ V /  __/ |  | |_) |       
|___/ .__/|_|  |_|_| |_|\__, | |_|  \___| \_/ \___|_|  |_.__/        
    |_|                 |___/                                     

Get that warm springey space in your music with an analog spring reverb
effect for 5$ or less.

What is a SPRING REVERB?
Before they had digital Effects processors, reverb was often made with
a spring or metallic plate through which the sound was transduced via a
a transmitting audio device and a recieving one. Like a speaker attached
to the spring (transmitting) and a microphone or piezo element on the
other, recieving end of the spring.
 
It gives a very warm dub twangy surf 1950s space si-fi / academic acoustic
music feel to your sounds.
The cool thing is that if you hit the spring or the box around it it will
make a huge psychedelic thunder sound.

What you need:

- Some kind of spring (A toy slinky, "Stair-spring" make sure its a metal one,
  or those springs inside cheap toy echo microphones)

- a Pair of crappy powered PC speakers, the ones everyone used like 10 + years
 ago, Thrust, Logitech, US Blaster etc. You probably have one lying around in
 the attic or cellar etc. Else, the thriftstore is your friend, they will have
 ZILLIONS for a few bucks. Just a normal 2 piece stereo will do you won't need
 any bass boost. Prefereably use ones with low voltage (9, 12 etc,) adapters
 so you dont electrocute yourself.

- wires

- Two wooden satay skewers

- jack plug in and outputs

- A box to conceal everything (wine crate for example)

- Tape and glue (preferably hot glue)

- Screws

        _ ___----___  audio input
             ----   \________
                             \
           __________________/
          /                                                   wooden case
  _______/                      spring                            |
 \           | _   _   _   _   _   _   _   _   _   _   _   _ | <---
  \          || | | | | | | | | | | | | | | | | | | | | | | ||
   \    screw|| | | | | | | | | | | | | | | | | | | | | | | ||
   /        ||||| = | | | | | | | | | | | | | | | | | | | |||-| screw    
  /          |  | | | | | | | | | | | | | | | | | | | | | | ||      
 /           |  |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |=|  |      
/            |    |                                      |   |      
\   skewer---|--> |                                      | <-|--- skewer       
 \__         |    |                                      |   |      
   /         |  __|________                      ________|___|        
  /          |  \         /                      \          /|
 /           |   \_______/                        \________/ |
/            |_____|___|____________________________|____|___|
\                 |_____|                       ______/_/
 \________________/_/                          \_________________----____ _
                                                                 ----
    powered PC speaker                      speaker cone      audio output
                                            (not powered!)
                                             
(schematic by prof.elektrovolt)

Attach the spring in the box with the screws so it hangs horizontally in the
air.
attach one end of the skewer to the speaker cone membrane with some hot glue
or gummy substance and the other end on one side of the spring, also with some
glue or gummy stuff...i guess you can use tape too.
Do the same for the other end of the spring for the recieving audio output
speaker. For better sound quality, ,make sure you put the audio output signal
of this machine in an instrument or mic input.

Make sure the audio input speaker is powered or use an amplifier before it.
The other recieving speaker should not be powered, its just the cone.

If you are competent you can probably make it so you can tighten the springs
with the screws to alter the spring reverb resonance/reverb time.
Or add some other cool stuff like flashing lights, a cover with foam rubber
very close to the spring, which you can slide open to get different acoustic
varieties of the spring reverb sound (in theory I guess). Use other types
of metal for the spring, or even submerge the spring in oil (not water!!) for
a really dark thunderous reverb!