On Tue, May 24, 2016 at 12:30 PM, Jonathan Gevaryahu via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Would it make more sense to use optoisolators here? I'm a bit leery of connecting motors/mechanical controls with an independent psu and a decent amount of induction directly to a c64 userport for fear of having the CIAs or other more irreplacable chips let out their smoke if the motors are at the end of their range.
Good question The connection is as such User Port ----> 4028 ----> Relays ----> Robot Arm The relays already provide the isolation from the motor power inside the robot arm I would use optoisolators in any interface which used semiconductors as drivers, instead of relays, *even* when Mosfets were used as the driver. These days you can get optoisolators which include an internal mosfet driver. Dan