^Is 1/8 the same as 3.5 mm?
Conversion says 1/8 = 3.175.
RPElectronics has all kinds of adapters, but 1/4 inch to 1/8 inch, I don't know.
RP Electronics - Test Instruments , Power Supplies , Inverters , Electronic Project Kits and more!
BTW, they finally moved to their new location on Rupert Street and Grandview Highway, across from Superstore.