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0.28-inch Dual LED Digital DC Voltmeter and Ammeter
0.28-inch dual LED digital DC voltmeter and ammeter for battery, solar, and power supply monitoring.
The 0.28-inch Dual LED Digital DC Voltmeter and Ammeter is a compact and reliable panel meter designed to simultaneously measure DC voltage and current in electronic systems. Featuring a bright dual-color 0.28-inch LED display, it clearly shows voltage and current readings in real time for easy monitoring.
This module is ideal for battery monitoring, DIY power supplies, solar systems, automotive applications, charging circuits, and embedded electronics projects. With its small size and panel-mount design, it fits easily into control boxes and enclosures. The module ensures stable performance, accurate readings, and simple wiring for quick installation.

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- Working current: matching for 30 mA, matching the communication for 8 mA.
- Dormancy current: no dormancy.
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- Security: Authentication and encryption.
- Profiles: Bluetooth serial port.
Potentiometer Sensor Module
TB6560 4 Axis Cnc Controller 4 Axis Stepper Motor Driver DSP Controlled 3.5A 24V
- 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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