RunOffGroove rarely disappoint, and this modulation box is no exception.
Seeing a lack of DIY projects for true vibrato they set out to fill that gap, and a fine job they made of it too, using readily available components that don't require any fiddly matching, biasing, fairy dust or hammers to get working. The project page linked above is well worth a read.
Two simple controls - Rate and Depth. Three modes - Vibe (take a guess!), Swirl (mild two-stage phasing) and Whirl (somewhere in between, rotary speaker-ish), should give you enough variation to make the fairly large build worthwhile.
We've managed to keep the whole thing withing a 5cm square PCB so it'll easily fit into a 1590B enclosure. There are six resistors on the back side of the board to achieve this footprint, but why not eh?
There's also an optional rate indicator LED for those of you who like flashy things.
Partial kit: PCB, all board-mounted components, pots.
Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.
Enclosure (pre-drilled) is only available with full kits, and will not take a battery. Knobs are not included.
Builds are only available with full kits including enclosure and vertical-mount pots. Please choose appropriate knobs.
PCB size: 50 x 50mm
Knobs required: 2
Direct-Connect compatible (4-way)
If you want the kit pre-built you must add the enclosure option below and select your knobs in the Components section. Check Specials for powder-coated enclosure availability. Builds only available with vertical-mount pots.
Download the INSTRUCTION PDF