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Rigol DS1054Z 12v Power Supply Noise Filtering

Since I fitted my scope with a SMPS based 12v input supply, there has been a noise problem on very low volts/div settings, this noise isn’t present on the mains supply, so I can only think it’s coming from the switching frequencies of the various DC-DC modules I’ve used.

Scope Ripple
Scope Ripple

Because of this I’ve designed a linear post-regulation stage for the supply, to remove the RFI from the DC rails.
This board takes the outputs from the DC-DC converters, removes all the noise & outputs clean DC onto the mainboard of the scope.

As the scope internally uses regulation to get the voltages lower, I’ve found that I don’t have to match the outputs of the mains supply exactly, for the +/-17.5v rails, 12v is perfectly fine instead.

Scope Linear PSU
Scope Linear PSU

Here’s the PCB layout, with the 6  common mode filters on the input (left), linear regulator ICs in the centre & the output filters on the right.

Scope Linear PSU
Scope Linear PSU

Here’s the schematic layout, as usual the Eagle Project files are in the link below, I’ll update when I have built the board & tested!

[download id=”5589″]

73s for now 🙂

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iPod

Front
Front

Old iPod with damaged screen. Here is the front with the Click Wheel.

Cover Removed
Cover Removed

Cover removed from the back, here the HDD is the biggest visible part.

Mainboard
Mainboard

Back cover removed from the unit, here is the back of the screen & the main PCB.

Back Cover
Back Cover

Back cover with the battery & headphone jack PCB.

Battery
Battery

Closeup of the Li-Ion battery.

Front Removed
Front Removed

Front removed from the unit, the touch sensitive Click Wheel PCB is folded away from the mainboard here.

Buttons
Buttons

Tactile switches underneath the Click Wheel.

HDD
HDD

1.8″ hard drive. Toshiba MK3008GAL.

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PSP Slim

Front
Front

Here is a PSP Slim that recently died.

Label
Label

For those that are interested, here is the ID label, this is a PSP-2003.

Front Removed
Front Removed

Here the front of the unit has been removed, showing the first internal components.

Screen Removed
Screen Removed

Here is the unit with the LCD removed, here the mainboard is partially visible.

Left Pad
Left Pad

Left pad unit removed from the PSP, with the left speaker & the memory stick slot cover.

Left Pad Rear
Left Pad Rear

Rear of the left pad assembly, showing the speaker.

Joypad
Joypad

Joypad removed from the casing. Resistive unit.

Output Jack
Output Jack

Headphone/data board removed from the casing. This also has TV-Out on the PSP-200x series.

Mainboard
Mainboard

Mainboard removed. Main CPU is at the top. Sockets around the bottom connect to the UMD drive & UMD Drive.

CPU & GPU
CPU & GPU

Closeup of the main chipset. CPU is the top IC.

Mainboard Rear
Mainboard Rear

Rear of the mainboard, Memory Stick socket on the right.

WiFi Chipset
WiFi Chipset

Closeup of the WiFi chipset & the charging power socket on the right.

Charging Chipset
Charging Chipset

Closeup of the bettery connector & the charge controller IC.

UMD Drive
UMD Drive

UMD Drive removed from the rear of the casing. This is a miniature DVD style drive, using a 635nm visible red laser.

UMD Drive Back
UMD Drive Back

Rear of the UMD drive, showing the laser sled & drive motors. Both the spindle motor & the sled motor are 3-phase brushless type. The laser diode/photodiode array is at the top of the laser sled.