{"product_id":"upc1237-speaker-protection-board-delay-mute-dc-offset","title":"UPC1237 Speaker Protection Board – Delay Mute \u0026 DC Offset","description":"\n\u003ch2\u003eUPC1237 Speaker Protection Board for HiFi \u0026amp; DIY Audio Amplifiers\u003c\/h2\u003e\n\u003cp\u003eKeep your speakers safe and your sound system performing at its best with the \u003cstrong\u003eUPC1237 Speaker Protection Circuit Board\u003c\/strong\u003e. Designed for DIY audio enthusiasts and audiophiles alike, this compact board integrates seamlessly into any 12V–24V amplifier setup, guarding your speakers against startup thumps and harmful DC voltage levels.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Power Supply Range:\u003c\/strong\u003e Compatible with 12V to 24V DC supplies, making it a versatile drop-in solution for a broad range of audio amplifier projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoot Delay Mute Function:\u003c\/strong\u003e Automatically mutes audio output at power-on for a brief period, eliminating disruptive startup thumping sounds and ensuring a smooth, clean start every time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC Offset Monitoring:\u003c\/strong\u003e Continuously monitors for unwanted DC voltage levels that could damage your speakers — if a DC offset is detected, the relay disconnects the speaker immediately to protect it.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIY-Friendly Design:\u003c\/strong\u003e Easy to integrate into existing HiFi power amplifiers or custom audio builds with minimal wiring effort — ideal for hobbyists and experienced builders.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpeaker Longevity Assurance:\u003c\/strong\u003e By blocking DC signals from reaching your drivers, this board helps preserve the integrity and lifespan of your speakers over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUPC1237 Speaker Protection Board\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetal \u0026amp; Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.25 × 3.1 × 4 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable Colors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue, Black\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12V – 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWireless\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × UPC1237 Speaker Protection Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Actual color may vary slightly from images due to monitor brightness settings. Please allow minor measurement tolerances of ±1–3 mm.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What power supply voltage does the UPC1237 speaker protection board require?\u003c\/h4\u003e\n\u003cp\u003eA: The UPC1237 speaker protection board operates with a wide input voltage range of 12V to 24V DC, making it compatible with most home audio amplifier power supplies and DIY HiFi projects.\u003c\/p\u003e\n\u003ch4\u003eQ: How does the DC offset detection feature protect my speakers?\u003c\/h4\u003e\n\u003cp\u003eA: The board continuously monitors the amplifier output for harmful DC voltage. If a DC offset is detected, the onboard relay instantly disconnects the speakers, preventing potential damage to the drivers and preserving their longevity.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this board suitable for a beginner DIY audio builder?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — the UPC1237 is designed with a DIY-friendly layout that makes it straightforward to wire into an existing amplifier circuit. Basic soldering skills and familiarity with audio circuit wiring are recommended for best results.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What power supply voltage does the UPC1237 speaker protection board require?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The UPC1237 speaker protection board operates with a wide input voltage range of 12V to 24V DC, making it compatible with most home audio amplifier power supplies and DIY HiFi projects.\"}}, {\"@type\": \"Question\", \"name\": \"How does the DC offset detection feature protect my speakers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board continuously monitors the amplifier output for harmful DC voltage. 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