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How and why: Installing a 12V trigger in a cheap TPA3251 based amplifier from Audiophonics | Audio Science Review (ASR) Forum
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DIY HOW TO Make a Home Theater AMP 12V Remote Trigger Relay that Comes on With AV Receiver - YouTube
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Quick Charging Trigger Board, Charger Voltage Tester Module 7V 9V 12V 20V 4- 12V Easy Operation Auto Testing For DIY PD Trigger Board With Voltmeter And Ammeter - Walmart.com
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