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2026-09-09

How to Choose a LAN Transformer (Part 1): Understanding Its Internal Structure | VOOHU

Understand differential pairs, pairsets and ports, then select a VOOHU LAN Transformer by data rate, port count and PoE current rating.

2026-08-28

PoE Ethernet Port Design: Six Questions Engineers Ask Most

VOOHU explains six common PoE design questions, from LAN Transformer DC bias and IEEE 802.3af/at/bt current ratings to 90 W component selection and the PD-side power budget.

2026-08-21

VOOHU Electronics--RJ45 illuminated interface LED lamp position, polarity, VF/IF and PHY driver verification method

When a customer used the VOOHU SYT561188AB1A3DY1027 RJ45 with light for design, they encountered a strange problem: the network port could be connected, but the lighting effect was wrong - the lights that should be on did not light up, and the lights that should not be on came on instead. After checking for a long time, I found that the problem was not with the connector, but with the polarity of the LED and the strap configuration of the PHY. The debugging process has been sorted out, I hope it will be helpful to everyone. First, clarify the facts on both sides of the connector and PHY. Take

2026-08-14

Current Transformer Selection in Practice: Can a 40A-Rated Model Really Measure 50A Peak Current?

Two days ago, an engineer doing power supply testing contacted us through the VOOHU official website. He is designing a 90kHz continuous sinusoidal current detection solution with a primary side peak current of 50A. He has a WHPT-EP100-018 current transformer on hand, but the rating in the specification book is 40A Max. He asked three questions: Does the 50A peak exceed 40A? Can Wen Sheng be able to bear it? Even if the temperature rises, will the magnetic core be saturated? Does the 50A peak exceed 40A? The first reaction of many engineers is "50 > 40, it must be exceeded." But w

2026-07-24

RJ45 MagJack Troubleshooting: No Link, LED Not Lighting or EMC Failures?

The integrated network port (Mag-Jack) integrates the network transformer, common mode inductor, Bob Smith termination and indicator light inside the RJ45. Its pins include differential pins, center taps, NC, GND, LED and other different functions, and the connection methods are different. Most of the three types of problems, such as network port failure, indicator light not lighting, and EMC failure, are not damaged components, but incorrect pin wiring. VOOHU Electronics (VOOHU) explains these three types of common wiring errors in four parts: phenomenon, root cause, correct approach, and sel

2026-07-10

FAQ Audio Isolation Transformer: Signal Goes In But Won't Come Out? – VOOHU WHTT4005 Primary-Secondary Isolation Test Full Analysis

In professional audio, broadcast communications, and industrial instrumentation systems, ground loop hum, common‑mode interference, and abnormal voltage coupling are three common signal‑chain problems. In mild cases, they raise the noise floor and degrade

2026-06-29

Standard Circuit DesignIsolated SPI Solution Standard Circuit Reference

This solution is VOOHU Electronics (VOOHU)'s standard isolated SPI solution. The company has focused on the field of communication electronic components for over 9 years, adhering to the business philosophy and service concept of "Choose VOOHU – Tru

2026-06-12

Ethernet Common Mode Choke Placement: Cable Side or PHY Side of the Transformer?

In Ethernet hardware circuit design, the LAN Transformer is a core component that ensures signal transmission and provides electrical isolation. The isolation transformer and common‑mode choke (CMC), as the two key supporting components of the Ethernet tr

2026-06-05

Solution Application AreasRS485 in Industrial Communication Applications – Part 1

In industrial communication systems, the selection of physical layer interfaces directly affects the signal integrity, reliability, and system cost of bus nodes. From multi‑node interconnection in PLC control cabinets, to lightning protection in outdoor s

2026-05-29

Product Selection Guide Reintroducing VOOHU Electronics SFP Connectors—Far More Than Just a "Cage for Optical Modules"

In today’s rapidly advancing world of high-speed data communication and optical interconnect technology, SFP cages have become indispensable physical interfaces in network equipment. From Gigabit to 800G, from data centers to 5G front‑haul, the form

2026-05-15

RS-485 Circuit Design: Transceiver, Termination, Bias, Isolation, Common Mode Choke and TVS

RS-485 (EIA/TIA-485 Standard)is a balanced differential bus standard for serial communication, published by the Electronic Industries Alliance in 1983. The RS-485 bus features long-distance transmission, multi-node networking, and strong common-mode rejec

2026-05-09

Standard Circuit DesignVOOHU Electronics — Standard Circuit Design Reference for CAN Communication

This solution is VOOHU Electronics (VOOHU)'s standard CAN communication solution. The company has focused on the field of communication electronic components for over 9 years, adhering to the business philosophy and service concept of "Choose VOOHU &ndash

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