geoffery Bob

Hardware engineer working on Ethernet connectivity — RJ45/MagJack, LAN transformers, PHY & PoE. I share selection notes, SI/EMC tips and reference designs for embedded/IoT devices.

Joined on Jul 23, 2026 https://www.voohuele.com/

Work

Hardware Engineer at VOOHU Electronics

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geoffery Bob

Jul 30

The LAN Transformer: PoE, Speed, and Selection

4 min read

geoffery Bob

Aug 13

The RJ45 Selection Decision-Making Process

2 min read

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geoffery Bob

Aug 11

How does a DIY alarm panel achieve single-wire PoE power supply and data transmission?

#rj45 #poe

2 min read

geoffery Bob

Aug 10

Typical RJ45 Circuit Designs – PHY Driver Types and Centre-Tap Connections

3 min read

geoffery Bob

Aug 6

The RJ45 production process

3 min read

geoffery Bob

Aug 5

Common electrical parameters of RJ45 connectors

#rj45

3 min read

geoffery Bob

Aug 4

Types of RJ45 Connectors

3 min read

geoffery Bob

Aug 3

Key components of the RJ45 connector

3 min read

geoffery Bob

Jul 31

The History, Standards, and Structural Basics of RJ45 Connectors

3 min read

geoffery Bob

Jul 29

The LAN Transformer: Signal Path and Isolation

#ethernet #rj45 #poe

4 min read

DEV Community

geoffery Bob

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Pinned

The LAN Transformer: PoE, Speed, and Selection

The RJ45 Selection Decision-Making Process

Want to connect with geoffery Bob?

How does a DIY alarm panel achieve single-wire PoE power supply and data transmission?

Typical RJ45 Circuit Designs – PHY Driver Types and Centre-Tap Connections

The RJ45 production process

Common electrical parameters of RJ45 connectors

Types of RJ45 Connectors

Key components of the RJ45 connector

The History, Standards, and Structural Basics of RJ45 Connectors

The LAN Transformer: Signal Path and Isolation