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July 2021 - Silicon Chip Online

Outer Front Cover; Contents; Publisher's Letter:Software:too many bugs, too many updates; Mailbag; Feature:The 2020 mission to Mars by Dr David Maddison ; Project:20A DC Motor Speed Controller by John Clarke ; Feature:How USB Power Delivery (USB-PD) works by Andrew Levido ; Feature:El Cheapo Modules:USB-PD chargers by Jim Rowe ; Project:Model Railway Level Crossing by Les Kerr