HP T620 Thin Client – PSU Hack And Windows PC Modification

The HP T-620 Thin Client is a powerful little machine, that with ease can be hacked into using a random 19VDC PSU and run Windows as any normal PC, easy and cheap PC!

This thin client was thrown out, without anything else than the box itself, no power supplies, no nothing.

The port and connector layout from the manual shows that the HP T-620 models needs a 19VDC power supply. A little searching showed that it was not as simple as just supplying it with 19VDC. HP has put in a few tricks to make a “smart laptop charger” so that you can only use their chargers.

The “smart laptop charger” restriction can be bypassed with a simple current limiting hack as per this little schematics.

All credits for this hack goes to: http://nerdipedia.com/wiki/tiki-index.php?page=Smart+laptop+charger

The machine itself is powerful enough to put a little work into modding it into a PC, running Linux or Windows off a USB disk or for some models, you can even find a spare SSD slot on the motherboard, unlucky for me, this model does not have that option.

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ABB TRIO 20 kW Solar Inverter – Unboxing and Teardown

Three-phase string inverter, 20000Wac, 2 MPPT, 4 DC inputs for each MPPT, RS485 communication interface, IP65 (NEMA4x) environmental protection degree, integrated DC and AC disconnect switch, DC and AC surge arrester (type 2), string fuses (4+4 on each MPPT) and single string current monitoring

Pictures and discussion: https://highvoltageforum.net/index.php?topic=813.0

Full details: https://new.abb.com/products/6AGC002904/trio-20-0-tl-outd-s2x-400-inverter

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Analog Panel Meter Shunt Calculation and Custom Scale Design

I needed a 50A current meter for the 1800W induction heater ( https://highvoltageforum.net/index.php?topic=530.0 ), but had none with the proper scaling. I do however have a large box of Kyoritsu KM-66 1 mA blank scale meters, so I decided to do a video on the following topics:

  • Learn how to calculate the shunt resistor for your analog panel meter
  • Guesstimate the internal resistance of a unknown meter
  • Design custom scales if you have a blank meter or want to use a meter for another purpose than its original.

Link to scale-o-matic: http://stiftsbogtrykkeriet.dk/~mcs/Scale.html
Link to Meter from Tonne software: http://www.tonnesoftware.com/meter.html

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Visiting The Expo: HI Tech & Industry Scandinavia 2019

I visited HI Tech & Industry Scandinavia 2019 in Herning, Denmark and while doing so I recorded clips of the most interesting robots, robotics, machines, vision, PLC and machine technology.

You can find booth exhibitions from Schneider Electric, Beckhoff, Flir, MakerBot, Wago, Rhode&Schwartz, Coherent and so on.

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Chinese 1800 Watt Induction Heater – Horizontal Oven Heat Insulation Test

Test with using regular mineral wool for house insulation, to insulated the work coil in order to achieve higher steel temperatures.

Here is another try, just with horizontal instead to contain some more heat, accidentally melted some plastic on the enclosure from that

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Chinese 1800 Watt Induction Heater – Heat Insulation Test

Test with using regular mineral wool for house insulation, to insulated the work coil in order to achieve higher steel temperatures.

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Chinese 1800 Watt Induction Heater, Boxed Up With Server PSU + Test

The 1800W Induction Heater is now boxed up with all power supplies, water cooling, foot switch, current meter and insulated work coil.

All information you could ever want to know about these 1800/2500 Watt Chinese induction heaters: https://highvoltageforum.net/index.php?topic=530.0

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Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown: Power amplifier (part 2 of 2)

This Nokia Siemens Networks Multiradio BTS FXEB module is a GSM 1800 MHz 90W amplifier module capable of GSM/EDGE, WCDMA/HSPA and LTE.

If you missed part 1, see it here: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown: Power amplifier (part 1 of 2)

The Flexi Multiradio Radio Frequency Module (FXxx) or RF Module, is a 3-branch multicarrier, multi-standard radio transceiver module. The module consists of three independent branches, capable of transmitting and receiving signals of multiple radio technologies concurrently.

Up to 6 GSM carriers with 400 KHz minimum carrier separation
Up to 4 WCDMA carriers with 4.6 MHz minimum carrier separation
Multi-carrier LTE signal with 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and 35 MHz carrier bandwidth
Multi RAT operation with combination of GSM, WCDMA, and LTE

Above pictures shows the coaxial cavity band pass filter which in popular speech is called a duplexer or diplexer. Duplexer band pass filter explained: https://youtu.be/HNaAQ3a7Duc?t=74

The power amplifier consists of a series of a general purpose amplifier, hybrid couplers to split the signals and power amplifiers.

First identifiable IC is a NXP MW7IC2040N 1805 – 1990 MHz capable of 40 Watt CW which feeds a single signal into the Anaren Xinger III X3C19P1-03S and X3C19P1-05S bybrid couplers to split the signal out, phase shifted to the three Ampleon BLF8G20LS-200V 1800 – 2000 MHz capable of 200 Watt.

One output circulator is used for double protection against reflected energy from the duplexer and antenna array. A interesting note about this amplifier module is that it only needs to be supplied with +28VDC, GND and PA_EN pulled high with 3.3VDC to start working. Adjustment for load balancing the LDMOS output transistors is done by a LM75A temperature IC and a digital potentiometer on I2C bus to control the bias of the transistors.

The system boards 4 ADC/DAC main processors are unknown HI FPGAs that has a generic part number which is not identifiable.

A Altera Arria II GX EP2AGX260 FPGA seems to be the heart of the unit and does all system control and communication with other units of the system. It has 16 transceivers that can run up to 550 MHz. 102600 Adaptive Logic Modules and 244188 Logic Elements available.

The analog to digital signal path for the RX diversity starts with the NXP BGU7062 which is a Low Noise Amplifier working in the 1710 – 1785 MHz region. A Anaren Xinger 1P503S 3dB hybrid coupler phase shifts the signal before entering the ceramic resonator filter. (explained here: https://youtu.be/h9-KhfQM3nI?t=729 ).

The RX/TX signal path are both a part of the signal suppliers for the power amplifier. The RX part consists of a Analog Devices ADL5811 Mixer and IF amplifier that works as a downconversion mixer (explained here: https://youtu.be/qO127zY3voE?t=865 ) which by the use of a local oscillator can bring down the carrier frequency of the signal to something lower that is easier to work with for the Analog Devices AD9255 14-bit ADC with a bandwidth of 125 MSPS.

The TX part consists of a Analog Devices AD9122 16-bit DAC with dual 1230 MSPS bandwidth feeding a analog signal through a Low Noise Amplifier and ceramic band pass filter before going to the power amplifier.

The internal clock for the up- and downconversion mixers is generated by the Analog Devices ADF4106 6 GHz PLL.

For the RX Main the analog to digital signal path starts with a Analog Devices ADL5356 1200 – 2500 MHz dual Mixer and IF amplifier that works as a downconversion mixer feeding down through SAW filters (explained here: https://youtu.be/qO127zY3voE?t=963 ) which feed into two Macom MAATSS0015 Digital Attenuators with a 4-bit resolution to provide 15 dB scale at DC – 2 GHz. Additional SAW filters are in place before the Analog Devices ADL5202 Variable Gain Amplifier that has a working bandwidth of 30 – 200 MHz, which also shows that the signal was downconverted earlier. On the opposite side of the PCB the Analog Devices AD80286 14-bit ADC is located with a dual bandwidth of 155 MSPS outputting a single bit stream to the Nokia Siemens protocol encoding FPGAs.

Power supply layout with a single bridge, planar transformer, output diode and output choke for each amplifier and one housekeeping power supply.

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750W Victron Solar Project – 60 Days Performance – Part 4

In part 4 I take a look at the efficiency and look at the performance over the last 60 days

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Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown: Power amplifier (part 1 of 2)

Teardown of a Nokia Siemens Networks Flexi Multiradio base station. This have been in service as a 3 antenna system for mobile telecommunications.

GSM/EDGE, WCDMA/HSPA and LTE capable. 3×90 Watt output power.

All high resolution pictures will be published with part 2

Flexi RF Module Triple (FXxx)

The Flexi Multiradio Radio Frequency Module (FXxx) or RF Module, is a 3-branch multicarrier,multi-standard radio transceiver module. The module consists of three independent branches, capable of transmitting and receiving signals of multiple radio technologies concurrently:

    Up to 6 GSM carriers with 400 KHz minimum carrier separation
    Up to 4 WCDMA carriers with 4.6 MHz minimum carrier separation
    Multi-carrier LTE signal with 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and 35 MHz carrier bandwidth
    Multi RAT operation with combination of GSM, WCDMA, and LTE

The RF Modules FXDA, FXDJ, FXEA, FXCA, and FXFA/ FXFB are referred to as 70W RF Module variants. RF Modules FXEB and FXDB are referred to as 90 W RF Module variants. Each branch consists of a transmitter and two receiver chains. FXxA and FXFB (70W) variants have front end software tunable filters (STuF). 90 W RF Module variants have fixed full band filters. FXxx is a 3U high module with an integrated, replaceable 3-fan assembly for module cooling. The supported functions are:

    Chaining up to three RF Modules with OBSAI RP3_01
    2-way receive diversity in the receiver chains
    Integrated antenna line supervision
    MHA, Antenna Hopping, EGPRS2, and VAMOS support
    Digital and control circuitry, optical interface, DC/DC power conversion, and other necessary functionalities
    Integrated DC line OVP, Class II rated to 5kA pulse (FXFB, FXDB/FXEB)
    Remote Electrical Tilt (RET) support (FXFB, FXDB/FXEB)

Flexi Multiradio BTS GSM/EDGE modules are equipped with an integrated air guide plate providing full thermal compliance without casings. This allows installation of the modules without casings in Flexi cabinets and enclosed 19″ racks. Casings and covers are recommended in standalone 19″ racks (no cabinet) for safety reasons. Casings are not part of the FXxx delivery package. If the configuration requires casings, Flexi BTS Module Casing (EMHA) kits must be ordered.

The Flexi Multiradio RF Module variants are:
Version    Description
FXDA     GSM 900 (E-GSM) 70W
FXDJ     GSM 900 J-Band (P-GSM for CDMA co-siting) 70W
FXEA     GSM 1800 70W
FXCA     GSM 850 70W
FXFA/FXFB GSM 1900 70W
FXDB     GSM 900 (E-GSM) 90W
FXEB     GSM 1800 90W

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