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4hp Spring Reverb driver module - schematic, pics, sounds
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Author 4hp Spring Reverb driver module - schematic, pics, sounds
Tombola
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Joined: 23 Jan 2011
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PostPosted: Mon May 30, 2011 2:07 pm    Post subject: 4hp Spring Reverb driver module - schematic, pics, sounds Reply with quote Add User to Ignore List

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


Last edited by Tombola on Tue Jan 03, 2012 7:04 pm; edited 1 time in total
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limpmeat
Ultra Wiggler


Joined: 08 Feb 2011
Last Visit: 30 Jan 2015

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Location: Melbourne

PostPosted: Mon May 30, 2011 6:51 pm    Post subject: Reply with quote Add User to Ignore List

looks great, love the front panel
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Neutron7
Oldschool bleeper


Joined: 23 May 2010
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PostPosted: Mon May 30, 2011 10:01 pm    Post subject: Reply with quote Add User to Ignore List

that tank sounds really nice. great job!
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mikecameron
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Joined: 20 Nov 2010
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Location: Peoria, IL

PostPosted: Mon May 30, 2011 11:17 pm    Post subject: Reply with quote Add User to Ignore List

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
Super Deluxe Wiggler


Joined: 08 Dec 2010
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Location: Jamaica Plain, MA

PostPosted: Tue May 31, 2011 8:09 am    Post subject: Reply with quote Add User to Ignore List

can't wait to try this out!
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Dego
Ultra Wiggler


Joined: 29 Jan 2009
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Location: Sweden

PostPosted: Tue May 31, 2011 8:51 am    Post subject: Reply with quote Add User to Ignore List

Very nice smile
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BugBrand
Knowledge of Bugs


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PostPosted: Tue May 31, 2011 9:05 am    Post subject: Reply with quote Add User to Ignore List

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

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mig27
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PostPosted: Tue May 31, 2011 9:55 am    Post subject: Reply with quote Add User to Ignore List

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
Super Deluxe Wiggler


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PostPosted: Tue May 31, 2011 10:21 am    Post subject: Reply with quote Add User to Ignore List

Some notes about the laser panel process here:

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

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mig27
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PostPosted: Tue May 31, 2011 10:37 am    Post subject: Reply with quote Add User to Ignore List

Thanks, appreciated.
Must look into this closer--

M
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KNYST
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PostPosted: Tue May 31, 2011 11:27 am    Post subject: Reply with quote Add User to Ignore List

sound, panel, photos, work, are all: SlayerBadger!
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Jarno
Super Deluxe Wiggler


Joined: 15 Nov 2010
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Location: Rosmalen, NL

PostPosted: Tue May 31, 2011 3:54 pm    Post subject: Reply with quote Add User to Ignore List

Thought you needed something with a bit more oomph to drive a reverb tank. Nice n small this, superb!
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fluxmonkey
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PostPosted: Tue May 31, 2011 9:12 pm    Post subject: Reply with quote Add User to Ignore List

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


Joined: 29 Mar 2010
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PostPosted: Tue May 31, 2011 10:49 pm    Post subject: Reply with quote Add User to Ignore List

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
Super Deluxe Wiggler


Joined: 23 Jan 2011
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PostPosted: Wed Jun 01, 2011 2:28 am    Post subject: Reply with quote Add User to Ignore List

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
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PostPosted: Wed Jun 01, 2011 2:35 am    Post subject: Reply with quote Add User to Ignore List

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
Super Deluxe Wiggler


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PostPosted: Wed Jun 01, 2011 4:47 am    Post subject: Reply with quote Add User to Ignore List

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
Learning to Wiggle


Joined: 18 Apr 2011
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PostPosted: Wed Jun 01, 2011 10:21 am    Post subject: Reply with quote Add User to Ignore List

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
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PostPosted: Wed Jun 01, 2011 10:25 am    Post subject: Reply with quote Add User to Ignore List

Both my tanks are 800 Ohm / 58 Ohm (input impedance / DC). 2575 Ohm / 200 Ohm (output impedance / DC).
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Tombola
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PostPosted: Sat Jun 11, 2011 7:07 am    Post subject: Reply with quote Add User to Ignore List

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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