My other monitors are a different model, and have a slightly different main PCB inside, but the process is mostly the same for converting these to 12v supply. In this monitor type, there is only a single board, with all the PSU & logic, instead of separate boards for each
Finally, here’s the last part of the Rigol 12v DC Power Supply project, the linear post regulation section to remove some of the ripple. I have made a couple of layout adjustments since the last post about this part of the project – a little more filtering on the DC
Continue readingRigol DS1054Z DC Power Supply – Linear Post Regulation
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. Because
Continue readingRigol DS1054Z 12v Power Supply Noise Filtering
Here’s some testing of the first bipolar supply for the Rigol scope. This is the +/-7.5v supply. Above is the supply built with it’s output filtering. The modules used are a PTN78020W for the positive rail & a PTN78060A for the negative rail. Under a 1A load across the total
Since everything in my shack is run from 12v, I thought it would be handy to convert my new scope to 12v as well, as 99% of the places I find myself needing test gear are off grid, with no access to mains supplies. Here’s the factory mains SMPS unit
Following on from my review, here are some internal views & detail on the components used in this radio. Below is an overview of the main PCB with the top plate removed from the radio. Most visible are these MOSFETs, which are Mitsubishi RD70HVF1 VHF/UHF power devices. Rated for a
As an ultracapacitor has a pretty linear discharge curve, some electronics are required to make them behave more like batteries, such as as SEPIC converter. On the right is a MuRata Power Solutions UQQ-12/8-Q12P-C switching regulator, which will accept a 9-36v input source & output a constant 12v at 8A
Here is an old electrochemical type carbon monoxide detector cell, from Monox. Hole in the centre is the inlet for the gas under test. DO NOT TRY THIS AT HOME! Electrochemical cells contain a substantial amount of sulphuric acid, strong enough to cause burns. This is a type of fuel cell
An old IDE interface Zip drive. This fits in a standard 3.5″ bay. Top cover removed from the drive, IDE & power interfaces at the top, in centre is the eject solenoid assembly & the head assembly. Bottom is the spindle drive motor. Head assembly with the top magnet removed.
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
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 shows that this is a model F5U021 hub, a rather old unit. PCB is here removed from the casing, Indicator LEDs along the bottom edge of