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Using Opto Couplers
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opto isolator - Can I change the voltage (12V) input into my optocoupler to 24 V? - Electrical Engineering Stack Exchange
DC 5V 9V 12V 24V Optocoupler isolation H/L Level Trigger 1-Channel Relay Module | eBay
3-5V/12V/24V One Way Optocoupler Isolation Module Photoelectric Isolator Signal | eBay
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Using Opto Couplers
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