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4-channel 12V relay module with optocoupler isolation
4-channel 12V relay module with optocoupler isolation for Arduino, Raspberry Pi, and microcontroller control of AC/DC devices.
The 4-Channel 12V Relay Module with Optocoupler Isolation is a robust solution for controlling high-voltage AC or DC devices using low-voltage microcontroller signals. Each of the four relays can handle loads up to 10A, making it ideal for home automation, robotics, and industrial electronics projects.
Featuring optocoupler isolation, indicator LEDs, and screw terminals for secure connections, this module ensures safe operation while protecting your microcontroller from voltage spikes. It is compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and other microcontrollers, providing reliable control for lights, motors, fans, and other appliances.

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58mm Thermal Printer (Black)
- Heavy-duty 58mm direct thermal printer
- Inbuilt Adapter
- High speed printing of 90mm / Sec
- Free Drivers, USB, Adapter and Paper Roll
- Interface: usb + cash drawer support.
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- High speed printing
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- Support cashbox drive.
- Compact and lightweight,beautiful design.
- Â Built in data bumper (data received when printing).
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- Relative humidity10~80%
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J-link Emulator V8 all-ARM JTAG Adapter Converter for TQ2440 MINI2440 K98
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- Rated maximum output: ± 4.5A, 40V, Peak 5A, low output impedance, source 0.5?,
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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes
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WH0201102 ABS 1.75 mm 1 kg Filament-Wanhao
- Material: ABS
- Color: White
- Material Diameter: 1.75mm
- Printing Temperature: 220° to 230°C
- Roundness Accuracy: +/- 0.5mm +/- 0.5mm
- Density: 1.31g/cm3 1.01g/cm3
- Mounted: Spool Mounted
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- Packaging Vacuum-sealed with desiccant to protect the filament from humidity
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