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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Optocoupler Isolation Board Signal Converter Module Voltage Level Current Voltage Converter Module 80KHz 1-Channel Optocoupler Photoelectric Optical Isolator Module Input Optoisolator 12V PC817 EL817

Product ID: 318006247

Details

Brand
DONGKER
Colour
Green
Item weight
0.01 Kilograms
Output voltage
12 Volts
Plug type
2-pin plug C

⚡Isolation Voltage >3000V

🔄Max Signal Frequency 80KHz

🔋Output Current up to 50mA

€ 37.44

Duties & taxes included

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Elevate your signal game with precision isolation and speed!

WIDE OPERATING RANGE - Reliable performance from -55℃ to 110℃, engineered for demanding professional applications.
ROBUST 3000 V ISOLATION - Safeguard your circuits with industry-leading voltage isolation for ultimate protection.
ANTI INTERFERENCE SHIELD - Built-in optocoupler technology ensures clean, noise-free signal transmission in complex environments.
HIGH SPEED 80 K HZ SWITCHING - Experience lightning-fast signal conversion that keeps your projects ahead of the curve.
VERSATILE CURRENT HANDLING - Supports up to 50mA output current, perfect for driving motors and logic circuits seamlessly.

The Optocoupler Isolation Board Signal Converter Module delivers superior electrical isolation exceeding 3000V, supports high-frequency signal conversion up to 80KHz, and handles output currents up to 50mA. Designed with EL817 photoelectric isolator technology, it ensures anti-interference protection and reliable operation across a broad temperature range, making it ideal for motor control, inverter applications, and sensitive circuit safeguarding.

Specifications

ASIN	B07YJL3MQQ
Best Sellers Rank	#130,319 in Electronics ( See Top 100 in Electronics ) #445 in Electrical Power Transformers
Brand	DONGKER
Color	Green
Customer Reviews	4.6 4.6 out of 5 stars (48)
Item Weight	0.01 Kilograms
Mfr Part Number	AAQ-WYY-9192
Model Number	AAQ-WYY-9192
Output Voltage	12 Volts
Plug Type	2-pin plug (e.g. Type C, Type E/F)
UPC	778836782307

Reviews

J**K

I used this to hook up a conductive probe to my Ender 3's 24v power supply. I had to swap the resistor for a higher rated one to do this as this optocoupler is rated for 12v but it worked wonderfully!

18.08.2020

M**M

Item works well. I use them on cars to take 12 volt inputs and activate low level 3.3 or 5 volt logic circuits on Raspberry Pis or Ardunios.

13.07.2020

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