Boss PH-2

As rad as this one would be, the IR3109s cost about $60 each, and it uses two of em. They could probably be emulated, but would make for quite a large build
 
@DGWVI as Robert said, the AS3109 is a direct drop in. There’s also the AR3109 from Audio Renaissance which I don’t think is available anymore but it’s just a pair of LM13700s and a few other parts; if the AS3109 has any availability issues, Robert could probably just layout the PCB to use four 13700s and an opamp in place of the 3109s.


I think coolaudio also makes a 3109 since behringer has been cloning lots of synths that have 3109s in them— just a matter of if they’re available on the consumer level yet
 
I've got one, and honestly, for a clone, I'd rather just focus on Mode II.
Mode I is a ho-hum phaser, and I never use it.
 
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