Author Topic: Beginner project suitable for spring reverb unit?  (Read 5395 times)

Gram

Beginner project suitable for spring reverb unit?
« on: February 25, 2014, 12:20:30 PM »
HI everyone,

I'm Gram (you can call me total noob) and I stumbled across this site while looking for schematics etc for building my own spring reverb...

After looking through some Youtubes I now know I'll need a pre-amp stage to drive the speaker that works the spring and also an post-amp stage to

boost the piezo pick-up signal on the receiving end of the spring.

I saw this on Ebay

http://www.ebay.co.uk/itm/231157796655?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

- a 2 channel amp board.

I plan to use left channel for speaker amping and right channel for piezo amping.

I note its a 5V board which means I could use USB port for power, but I'd also like to be able to power with a 9V battery.

I've attached pics of a flow diagram that shows what i think needs to happen and a schematic that I've taken as far as I can, based on the

beginner build pictorial...

http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/image.jpeg.html

http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/image-2.jpeg.html

So I guess my questions are...

1) Is above board fit for purpose?

2) If so, can I use a 9V battery to power it via a mod of some sort?

3) If not, is the beginner boost project something I could make and use instead?

Also, I'm not sure where the R- out from the amp board goes or what the SW is.

Any help or advice GREATLY appreciated!  ;D

Gram

mth5044

Re: Beginner project suitable for spring reverb unit?
« Reply #1 on: February 25, 2014, 12:43:37 PM »
Read these articles to learn why or whynot your ideas won't work:

http://sound.westhost.com/articles/reverb.htm
http://sound.westhost.com/project34.htm

Take particular note of the input and output impedances of spring reverb tanks. They come in a couple varities and you cannot just hook them up with whatever driver circuit and expect them to work perfectly.

Check out the Stage Center Reverb for a pretty simple spring reverb project.

For the 5v power, you can use a power regulator, such as a 7805, to reduce the 9v power down to 5v.
« Last Edit: February 25, 2014, 12:45:15 PM by mth5044 »

Gram

Re: Beginner project suitable for spring reverb unit?
« Reply #2 on: February 25, 2014, 02:20:22 PM »
Thanks Matt!

I'm away to do some reading  :)

G

mth5044

Re: Beginner project suitable for spring reverb unit?
« Reply #3 on: February 25, 2014, 05:52:09 PM »
No problem. Sorry I was a bit off putting, I was in a hurry and, quite frankly, I don't know as much as I should about spring reverbs. Those two links are very helpful in understanding what's going on as well as showing circuits to use. PRR had drawn up a very simple LM386 driven spring reverb that I'll be putting together in a week or so. If it works, I have an extra board or two if you want to use them.

Gram

Re: Beginner project suitable for spring reverb unit?
« Reply #4 on: February 26, 2014, 11:39:44 AM »
Not a problem - the stuff I've been looking at previously is more mechanical than electronic..

http://www.electronicpeasant.com/projects/springs/springs.html

I was going to bodge something together using spare stuff I had lying around but I've decided to buy a breadboard kit so I can try learn

as I go...

Let me know how your project goes -

Yazoo

Re: Beginner project suitable for spring reverb unit?
« Reply #5 on: February 27, 2014, 09:13:00 AM »
I've tried both the Stage Center reverb and the Westhost reverb project. The Stage Centre did work but I was much happier with the Westhost project.