mains voltage detection – Hamtech Electronics Technologies https://hamtechtechnologies.com Sun, 21 Jun 2026 07:54:49 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.3 https://hamtechtechnologies.com/wp-content/uploads/2025/11/h-100x100.webp mains voltage detection – Hamtech Electronics Technologies https://hamtechtechnologies.com 32 32 ZMPT101B AC Voltage Sensor https://hamtechtechnologies.com/product/zmpt101b-ac-voltage-sensor/ https://hamtechtechnologies.com/product/zmpt101b-ac-voltage-sensor/#respond Mon, 17 Nov 2025 16:38:41 +0000 https://hamtechtechnologies.com/?post_type=product&p=162 The ZMPT101B AC Voltage Sensor Module is a compact, high-accuracy voltage measurement board designed for single-phase AC voltage sensing up to 250V. It features the ZMPT101B precision voltage transformer and a high-accuracy operational amplifier circuit, enabling clean and stable signal sampling for microcontrollers.

This module outputs a sine-wave signal centered around a DC bias, making it easy to interface with analog-to-digital converters (ADC). The onboard potentiometer allows you to adjust the output amplitude without affecting the signal’s center value, giving flexible calibration for your application.

It is widely used in energy meters, power monitoring, smart home systems, voltage protection circuits, IoT data logging, and custom AC measurement projects.

Key Features:

  • Voltage Measurement Range: AC 0–250V

  • Voltage Transformer: Precision ZMPT101B

  • Output Signal: Sine wave (biased around mid-point DC level)

  • Sampling Circuit: High-precision op-amp with compensation

  • Supply Voltage: 5V–30V

  • Adjustable Sensitivity: Onboard multiturn potentiometer

  • Output waveform amplitude adjustable without shifting center value

  • Filtering Option: Add a capacitor (~105pF) at OUT to remove DC bias

  • PCB Dimensions: 49.5 × 19.4 mm

Applications:

  • AC mains voltage monitoring

  • Smart energy meters

  • IoT home automation systems

  • Over/under-voltage protection circuits

  • Real-time energy monitoring

  • Power quality analysis

  • Industrial automation

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