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Water Still Getting into a Waterproof RJ45 After Installation? IP65 vs IP67, Panel Thickness and the Mated State

Water Still Getting into a Waterproof RJ45 After Installation? IP65 vs IP67, Panel Thickness and the Mated State

Outdoor cameras, EV chargers and industrial gateways fitted with a waterproof RJ45 can still take in water after rain or a spray test. This article walks through the leak path, IP65 vs IP67, the mated-state condition for IP67, the 3 mm panel thickness limit, cutout and seal, 90°/180° swaps, rear routing and insulation retest, with VOOHU WHPMWRJ part numbers and a 10-item sample checklist.

Changing a PoE Device's Output from 12V to 5V: Can You Keep the Same Power Transformer? 2.4× Current, Auxiliary Winding and Same-Series 5V Parts | VOOHU

Changing a PoE Device's Output from 12V to 5V: Can You Keep the Same Power Transformer? 2.4× Current, Auxiliary Winding and Same-Series 5V Parts | VOOHU

Changing a PoE camera or AP's isolated supply from 12V to 5V? At the same 13W, a 5V output delivers 2.4× the current of 12V, secondary copper loss rises about 4×, and the auxiliary winding voltage can fall below the controller's UVLO. Using the VOOHU selection table, we list same-power 12V, 24V and 5V parts in the EP7, EP13, EFD15 and EFD20 series, plus the circuit changes and a 10-point prototype checklist.

Can Two Molded Power Inductors Be Paralleled for More Current? Inductance, DCR Sharing and Trace Resistance | VOOHU

Can Two Molded Power Inductors Be Paralleled for More Current? Inductance, DCR Sharing and Trace Resistance | VOOHU

Thinking of adding a second molded inductor in parallel to carry more current? Paralleling halves inductance and doubles total ripple, and DC current divides by DCR and trace resistance. At low inductance, PCB copper can outweigh inductor DCR. We compare two small parts against one larger VOOHU WHYT part and cover multiphase options and layout checks.

What Resistor Goes on the Secondary of a 600 Ω Audio Transformer? Checking the 600:290 Rating, Winding Resistance and Line Return Loss | VOOHU

What Resistor Goes on the Secondary of a 600 Ω Audio Transformer? Checking the 600:290 Rating, Winding Resistance and Line Return Loss | VOOHU

Many 1:1 audio transformers are rated 600:290 or 600:301. What goes on the secondary? Using VOOHU selection table data: why the secondary rating is the termination value, why 600 Ω makes the line see 912 Ω, why the level drops after correct termination, and how to terminate receive and transmit circuits.

Ethernet Port Dead After a Lightning Strike or Surge Test: Is It the LAN Transformer or the PHY? | VOOHU

Ethernet Port Dead After a Lightning Strike or Surge Test: Is It the LAN Transformer or the PHY? | VOOHU

A dead Ethernet port after a surge does not necessarily mean the LAN transformer failed. How surges reach the port, a power-off method that measures each side of the transformer, how to use an insulation tester without being fooled by the GDT, three common pitfalls, and a 10-point repair checklist.

Can a Tab-Up RJ45 Jack Replace a Tab-Down One? Latch Orientation, Mirrored Pinouts and LED Position Checks | VOOHU

Can a Tab-Up RJ45 Jack Replace a Tab-Down One? Latch Orientation, Mirrored Pinouts and LED Position Checks | VOOHU

Swapping a tab-up RJ45 jack for a tab-down one? Of 774 VOOHU RJ45 parts, only 85 single-port MagJacks are tab-down, and just 2 of those are SMT, both 10/100M. Why a mirrored jack swaps pairs A and D beyond what Auto-MDIX can fix, plus LED, stacked-port and panel checks.

SFP Module Running Hot? Vented vs. Heat-Sink Cages and the Lower Port of a 2×1 Stack | VOOHU

SFP Module Running Hot? Vented vs. Heat-Sink Cages and the Lower Port of a 2×1 Stack | VOOHU

SFP module temperature alarms? Only 13 of 205 VOOHU SFP, SFP+ and SFP28 cages carry a heat sink, and all are single-row 1×N; none of the 135 stacked 2×N parts do. How to read DDM, reassign hot modules, check airflow and allow the 4 mm clearance a heat-sink cage needs.

Can an Audio Isolation Transformer Run on a 48 V Phantom-Powered Line? Silent Mics, Center Taps and 7 mA DC Bias | VOOHU

Can an Audio Isolation Transformer Run on a 48 V Phantom-Powered Line? Silent Mics, Center Taps and 7 mA DC Bias | VOOHU

Can an audio isolation transformer sit on a 48 V phantom-powered mic line? In series it blocks phantom and silences condenser mics; at a preamp input the winding carries only microamps until one leg shorts to ground and drives about 7 mA through it. Using data for all 27 VOOHU WHTT audio transformers, this article covers center-tap screening by pin count, fault currents and demagnetisation.

RJ45 Gold Plating 3U vs 6U vs 50U: Mating Durability, Contact Resistance and Coupler Selection | VOOHU

RJ45 Gold Plating 3U vs 6U vs 50U: Mating Durability, Contact Resistance and Coupler Selection | VOOHU

What is the difference between 3U, 6U and 50U gold plating on RJ45 contacts? Plating thickness sets mating durability and corrosion resistance, not bandwidth. Using VOOHU Cat5e and Cat6 coupler data, this article explains how thin gold fails, which grade fits each application, where cost can be cut and how to verify plating on samples.

Choosing a Chip LAN Transformer: Six Sizes Mapped to Data Rate, PoE Class and OCL | VOOHU

Choosing a Chip LAN Transformer: Six Sizes Mapped to Data Rate, PoE Class and OCL | VOOHU

A full comparison of the 23 chip LAN order codes VOOHU offers across six sizes. 2012 and 3216 are Cap+CMC and contain no transformer at all; only 3532A, 4532B, 4532E and 5335A are true surface-mount LAN magnetics. The parts are laid out as a data-rate by PoE-class lookup, explaining why a higher PoE class forces a larger package, why 10G needs only 120 uH, and where 4532B and 4532E diverge despite sharing a size.

Ethernet Switch IC Uplinks: What “5+2” and “8+2” Really Mean, RGMII Levels and the 1.1 V Core Rail | VOOHU

Ethernet Switch IC Uplinks: What “5+2” and “8+2” Really Mean, RGMII Levels and the 1.1 V Core Rail | VOOHU

A parameter-by-parameter comparison of the 20 JLSemi Ethernet switch ICs distributed by VOOHU: what the “+N” uplink in 5+2 and 8+2 actually is, the three things an Interface Mode of NA rules out, matching RGMII IO levels at 1.8/2.5/3.3 V, which three types really support a 1000Base-X fibre uplink, the two notations for the 1.1 V core rail, and what to use when JL5109C, JL5110C, JL6105 and JL6108 have no industrial version.

How to Choose an ESD Protection Diode for an Ethernet Port: 0.3-1.2 pF Capacitance, Discharge Ratings and Package Fit | VOOHU

How to Choose an ESD Protection Diode for an Ethernet Port: 0.3-1.2 pF Capacitance, Discharge Ratings and Package Fit | VOOHU

ESD testing passes but the gigabit link goes unstable once protection is fitted? This guide sets the selection order by capacitance, voltage grade and structure, compares ten VOOHU ESD, GDT and MOV parts, and lists the board-level checks.

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