[vcf-midatlantic] June 11/12 Workshop - Who's Going? Whatcha working on?

Dan Roganti ragooman at gmail.com
Tue May 24 12:41:00 EDT 2016

On Tue, May 24, 2016 at 12:30 PM, Jonathan Gevaryahu via vcf-midatlantic <
vcf-midatlantic at 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

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