Available as an assembled Module and as a DIY project.
This Module is currently available.
8 channel gate to solenoid, motor or relay controller
Analogue Robot Control can drive 8 solenoids, motors or relays with voltage directly from the power supply. Motor driving power circuit and gate input circuit are optically isolated without any ground connection. Requires external power supply. Suitable for driving solenoids, relays etc. between 5V and 12V.
https://www.etsy.com/shop/AnalogRobotOrchestra?ref=simple-shop-header-name&listing_id=999748633
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