INNX0

LM1875 power amplifier board

Overview

The LM1875 is a power amplifier integrated circuit developed by National Semiconductor. This device features a small package, simple peripheral circuitry, and excellent overload protection, making it suitable for use as an audio power amplifier in audio systems.

The LM1875 incorporates internal overload, overheat, and inductive load reverse potential protection, ensuring stable operation under various conditions.

This circuit utilizes a dual-channel LM1875T 20W audio power amplifier.

A π-type filter circuit is used at the power input.

The power supply is a 12-24V DC-DC converter.

A 24V 3A or higher power supply is recommended.

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BOM.xlsx

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PDF_LM1875 power amplifier board.zip

Altium_LM1875 power amplifier board.zip

PADS_LM1875 power amplifier board.zip

BOM_LM1875 power amplifier board.xlsx

95776

Touchscreen stand light

The touch-sensitive stand light has adjustable brightness and can be stood upright using a casing or inserted into some stand bases.

This is a touch-sensitive stand light using the RH6618A chip. It has adjustable brightness and can be stood upright in its casing or inserted into stand bases. However, two LEDs are not working, and I don't know why. The 3D-printed casing isn't very transparent, possibly due to the material chosen. Also, I forgot to include a hole for the switch in the casing design, and the battery hole wasn't deep enough (embarrassing).

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4b2e7cea33ff50415f5b68596ded8d19.mp4

c9ef46579bbb02d1e8d18752a3caf4f3.mp4

PDF_Touchscreen Stand Light.zip

Altium Touchscreen Stand Light.zip

PADS_Touchscreen Stand Light.zip

BOM_Touchscreen Stand Light.xlsx

95777

electronic

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-24 08:58:56

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