The standard connector size used for jacks and cables in Eurorack format modular synthesizers. Note that this is slightly larger that 1/8”.
The Buchla system uses a slightly different 3.5mm jack and plug called Tini-Jax created by Switchcraft, which is slightly different mechanically than all the other 3.5mm jacks and plugs out there. It is not advisable to connect a Tini-Jax plug into a 3.5mm jack; over time, it may spread the internal contacts too far apart to reliably connect to 3.5mm jacks in the future.
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