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Watch out! I just nuked 1-post user "gear101" after receiving five different complaints over the course of about 20mins that he's sending PMs to people offering to sell gear. Seems pretty fishy! I'm sure he'll be back under a different name but with the same old game. Be careful! Thanks to everyone who let me know about this guy.



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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
Super Deluxe Wiggler


Joined: 23 Jan 2011
Last Visit: 29 Jul 2014

Posts: 1239
Location: London, England

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 Jul 2014

Posts: 824
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
Last Visit: 29 Jul 2014

Posts: 1140

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
Thread Killer


Joined: 20 Nov 2010
Last Visit: 29 Jul 2014

Posts: 774
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
Ultra Wiggler


Joined: 08 Dec 2010
Last Visit: 29 Jul 2014

Posts: 986
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
Veteran Wiggler


Joined: 29 Jan 2009
Last Visit: 29 Jul 2014

Posts: 750
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


Joined: 15 Jul 2008
Last Visit: 30 Jul 2014

Posts: 4435

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
Wiggling with Experience


Joined: 30 Nov 2010
Last Visit: 23 Jul 2014

Posts: 302
Location: Berlin

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


Joined: 23 Jan 2011
Last Visit: 29 Jul 2014

Posts: 1239
Location: London, England

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
Wiggling with Experience


Joined: 30 Nov 2010
Last Visit: 23 Jul 2014

Posts: 302
Location: Berlin

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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