I am having an issue with an alternating polarity output. I have a 12V supply and when triggered i am supplying 5V to a solenoid then after 4 seconds supplying the opposite polarity to the same solenoid. I can successfully get the voltage and polarities correct with the attached diagram but the problem i am running into is that the solenoid does not have time to discharge the coil when switching polarity via a DPDT relay and does not change state.
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