The description says "24v voltage level converter" then later "12v". can i use 24v at the "+ input" terminal?

Yes , I am using this on a 3D printer at 24V.

What can i do with this?

This allows small, low current signals to switch larger voltages/currents like a switch, but in an isolated manner. It can also work in the opposite manner, high to low. The source circuit is completely isolated from the target circuit. I used this on my 3D printer to take a 24V digital signal and convert it to a 3.3 V signal connected a microcontroller pin on the board.

I need an optocoupler that receive 16vac from doorbell system and that produce 3.3v to connect to gpio pin from esp-01s. can i use this optocoupler?

It would convert then AC signal to a square wave signal.

Hi, Does it work with audio signals or audio amplifiers? or its just designed for digital signals?

In theory it can handle a signal frequency up 80KHz which is within the range of an audio signal. There are are two resistors on the board, one on the input and one on the output that can cut your signal. You may need to change these out depending on the level of your audio signal. I have seen the underlying chip, PC817, used in audio circuits (can't provide the link here but search on PC817). It conducts current in one direction so the audio would be distorted at best.

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🔌 Power Up Your Projects with Confidence!

HIGH SPEED PERFORMANCE - Achieve rapid signal conversion with a high-level trigger frequency of 80KHz.
VERSATILE APPLICATIONS - Ideal for inverters, motor drives, and high voltage testing, this module adapts to your needs.
ROBUST CURRENT HANDLING - Handles input and output currents up to 50MA, making it perfect for high-demand applications.
UNMATCHED ISOLATION POWER - Experience over 3000V of electrical isolation, ensuring your circuits are protected from interference.
CUSTOMER CENTRIC ASSURANCE - Shop with confidence, backed by our dedicated after-sales service to ensure your satisfaction.

The DONGKER Optical Isolator Module is a high-performance optocoupler designed for robust signal conversion and isolation. With a voltage isolation exceeding 3000V and a maximum output current of 50MA, it is perfect for applications requiring reliable performance and protection against electrical noise. Its high-speed trigger capability of 80KHz makes it suitable for various uses, including inverters and motor control, ensuring your projects run smoothly and efficiently.