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Power Pack Regulator Update

7.5v Regulator
7.5v Regulator

To help make my system more efficient, a pair of switching regulators has been fitted, the one shown above is a Texas Instruments PTN78060 switchmode regulator module, which provides a 7.5v rail from the main 12v battery pack.

A Lot like the LM317 & similar linear regulators, these modules require a single program resistor to set the output voltage, but are much more efficient, around the 94% mark at the settings used here.

The 7.5v rail supplies the LM317 constant current circuit in the laser diode driver subsection. This increases efficiency by taking some voltage drop away from the LM317.

5v Regulator
5v Regulator

The 7.5v rail also provides power to this Texas Instruments  PTH08000 switchmode regulator module, providing the 5v rail for the USB port power.

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Laser Diode Driver

Connection

Closeup
Closeup

The parts arrived for my adjustable laser diode driver! Components here are an LM317K with heatsink, 100Ω 10-turn precision potentiometer, 15-turn counting dial & a 7-pin matching plug & socket.

Driver Schematic
Driver Schematic

Here is the schematic for the driver circuit. I have used a 7-pin socket for provisions for active cooling of bigger laser diodes. R1 sets the maximum current to the laser diode, while R2 is the power adjustment. This is all fed from the main 12v Ni-Cd pack built into the PSU. The LM317 is set up as a constant current source in this circuit.

Installed
Installed

Here the power adjust dial & the laser head connector have been installed in the front panel. Power is switched to the driver with the toggle switch to the right of the connector.

Regulator
Regulator

The LM317 installed on the rear panel of the PSU with it’s heatsink.

Connection
Connection

Connections to the regulator, the output is fully isolated from the heatsink & rear panel.

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Belkin F5U021 4-Port USB Hub

Top
Top

This is an old USB 1.1 hub that was recently retired from service on some servers. Top of the unit visible here.

Bottom Label
Bottom Label

Bottom label shows that this is a model F5U021 hub, a rather old unit.

PCB Front
PCB Front

PCB is here removed from the casing, Indicator LEDs along the bottom edge of the board, power supply is on the left. Connectors on the top edge are external power, USB host, & the 4 USB outputs. Yellow devices are polyswitch fuses for the 500mA at 5v each port must supply.

USB Hub IC
USB Hub IC

This is the USB Hub Controller IC, which is a Texas Instruments TUSB2046B device. Power filter capacitors next to the USB ports are visible here also, along with 2 of the polyswitches.

Power Supply
Power Supply

The power supply section of the unit, which supplies regulated 5v to the ports, while supplying regulated 3.3v to the hub controller IC. Large TO-220 IC is the 5v regulator. Smaller IC just under the power selector switch is the 3.3v regulator for the hub IC. The switch selects between Host powered or external power for the hub.