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4hp Spring Reverb driver module - schematic, pics, soundsGoto page 1, 2, 3 ... 10, 11, 12  Next [all]
 MUFF WIGGLER Forum Index -> Music Tech DIY
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Author 4hp Spring Reverb driver module - schematic, pics, sounds
Tombola







PostPosted:     Post subject: 4hp Spring Reverb driver module - schematic, pics, sounds

I was just about to buy an A199 spring reverb when I decided to save 4hp of space and build my own.

The circuit is based on Roy Mallory's tech note and tone control, which is useful - a symmetrical cut/boost of bass and treble. The drive, recovery, tone and blend buffer take the four amps in a TL074.

The gain on the drive circuit is reduced quite a bit - R10 is 660R rather than 62R (it's R1 in Mallory's article), and the recovery circuit has a variable drive.

I put a couple of phono jacks on the back of my Doepfer case, so it's easy to plug in an external tank - a nice rich 6-spring 9EB2C1B (mainly because I built the circuit with the 8EB2C1B from a fender amp)

[s]http://soundcloud.com/musicthing/diy-spring-reverb-module[/s]

UPDATE: See revised schematic
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limpmeat







PostPosted:     Post subject:

looks great, love the front panel
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Neutron7







PostPosted:     Post subject:

that tank sounds really nice. great job!
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mikecameron







PostPosted:     Post subject:

I have been thinking of doing this very thing! Thanks for sharing your work, I'll be building it soon. applause
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jimmyambulance







PostPosted:     Post subject:

can't wait to try this out!
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Dego







PostPosted:     Post subject:

Very nice smile
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BugBrand







PostPosted:     Post subject:

Nice work.
And especially thanks for the links to Roy Mallory's interesting articles.
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mig27







PostPosted:     Post subject:

Nice one!

And I also dig the plexi front plate.
Looks a bit like my OSC303.

Care to share how you built these?
I'm currently looking cheaper front plate alternatives than the usual Schaeffer job

Thanks!


Michael
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Tombola







PostPosted:     Post subject:

Some notes about the laser panel process here:

https://www.muffwiggler.com/forum/viewtopic.php?t=35668
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mig27







PostPosted:     Post subject:

Thanks, appreciated.
Must look into this closer--

M
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KNYST







PostPosted:     Post subject:

sound, panel, photos, work, are all: SlayerBadger!
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Jarno







PostPosted:     Post subject:

Thought you needed something with a bit more oomph to drive a reverb tank. Nice n small this, superb!
thumbs up
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fluxmonkey







PostPosted:     Post subject:

nice to hear a demo comparison between the 2 springs.
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boothnavy







PostPosted:     Post subject:

If you made R10 in your circuit variable with a pot, could you then control the input amount?

Also, would any modification be necessary if using 15v?
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Tombola







PostPosted:     Post subject:

Boothnavy: I did try that on the breadboard with a 1k pot, because I assumed I'd build it with variable drive and fixed recovery. It didn't work well for me - very limited useful range, quick to distort in a nasty way, but then I didn't test it with a huge range of input signals.

Re: 15v - sorry, I have no idea - I guess the TL074 datasheet would give you the max voltage. The other values don't seem that critical so you'll probably be fine.
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Tombola







PostPosted:     Post subject:

R9 is another interesting one - it's a kind of damping/stabilising on the recovery circuit - worth experimenting with - or removing - on breadboard
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Tombola







PostPosted:     Post subject:

BugBrand wrote:
Nice work.


Very kind - particularly given that you got me started on this in the first place:

http://musicthing.blogspot.com/2008/11/tom-bugs-teaches-diy-synth-buil ding-in.html
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Glitch Militia







PostPosted:     Post subject:

What input / output impedance is this designed for ? I do not know that tank that you got.

I currently got this one on breadboard, tweaking some values etc. I like the sound of yours, so I'll try that next. applause

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Tombola







PostPosted:     Post subject:

Both my tanks are 800 Ohm / 58 Ohm (input impedance / DC). 2575 Ohm / 200 Ohm (output impedance / DC).
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Tombola







PostPosted:     Post subject:

This shows off the sound of the big six spring tank quite well. (

Disappointingly, the six springs are actually mounted as three springs with joints between the separate springs... )

[s]http://soundcloud.com/musicthing/maths-qmmg-anti-oscillator-diy[/s]
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timpecter







PostPosted:     Post subject:

That is a great demo, Tombola! I'm experimenting with spring reverb now and it's inspiring to hear.
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cyklopljud







PostPosted:     Post subject:

Yes yes maybe I'm a lazy DIY'er, but.... any chance of a vero layout of this anywhere..... help
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Tombola







PostPosted:     Post subject:

Sorry, as you can see from the pic, I laid it out in a rather freestyle/chaotic way on pad-per-hole perfboad with lots of kynar wire... Would be a tiny board if you did it properly!
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Jarno







PostPosted:     Post subject:

I consider myself to be lazy as well, and I think duplicating a vero or perf layout is just too much effort, I always make it up as I go. So much easier when you just have to look at the schematic instead of also looking at the layout as well, of course a pcb is even easier still ;-)
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Tombola







PostPosted:     Post subject:

I always build first on breadboard, to get the thing working and get confidence that all the components are right and that I 'know' the circuit - I don't think I've ever successfully built a circuit by following a vero layout - I'm not precise/patient enough. I have a shelf full of non-working stompbox circuits built like that! d'oh!
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