Best speaker Protection Board, सबसे अच्छा स्पीकर प्रोटेक्शन बोर्ड uPC1237

In this video , I have explained that how to use uPC1237 IC for making speaker circuit protection board. This IC was earlier manufactured by NEC by now available in generic brands. However the performance of this IC is very good and application is very simple.
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The UPC1237 is an IC for stereo amplifier and speaker protection, featuring a wide 25V-60V operating voltage range, built-in relay driver, and customizable power-on delay and output offset detection. It offers latching or auto-resetting functions, and can detect positive and negative DC output offsets to prevent damage to loudspeakers. The chip's functionality depends on external components, and its precise specifications are detailed in the official datasheet from manufacturers like Unisonic Technologies.
Key Features & Specifications
Purpose: Protects stereo power amplifiers and loudspeakers from DC offsets, power surges, and other issues.
Supply Voltage: A wide operating range from 25V to 60V is supported.
Protection Functions:
Power-on Delay: A time delay is implemented before the relay activates, preventing "thump" noises.
Output Offset Detection: Detects both positive and negative DC voltage shifts at the amplifier's output.
Power-off Protection: Disconnects the speaker when the amplifier is turned off.
Integrated Relay Driver: Includes a built-in driver for the protection relay.
Flexible Functions: Offers selectable latching or automatic resetting functions by configuring Pin 3.
Single Power Supply: Requires only a single power source to operate.
How It Works
Power-on Delay: When the amplifier turns on, the UPC1237 creates a delay before activating the protection relay. This ensures the amplifier is stable before the speakers are connected, preventing a shock noise or thump.
DC Offset Detection: The circuit continuously monitors the amplifier's output for any significant DC voltage.
Protection Activation: If the DC offset exceeds a preset threshold (determined by external components), the relay is activated.
Speaker Disconnection: When the relay is activated, it disconnects the speaker from the amplifier, preventing the voice coil from overheating.
Power-off Action: In the event of a power failure, the circuit can be configured to rapidly disconnect the speaker.
Important Considerations
External Components: The exact threshold voltages for DC detection and the power-on delay time are determined by the values of external resistors and capacitors, as specified in the datasheet.
Datasheet Reference: For complete and precise specifications, refer to the official datasheet from the manufacturer, such as Unisonic Technologies or NEC