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Since youtube changed their notification setup a long while ago, you might be missing out on notifications about my new videos. Be sure to check if you have the “bell” clicked next to the subscription! Thank you 

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Moving to a new lab (part 5 and 6) tour and finally its operational

Here you get a short glimpse of the new space for the laboratory and the final setup.

This is part 5 and 6 in a series of videos on moving out, moving in and setting up the new lab / work shop.

I am moving out of the apartment and into our own house, which has a room dedicated to the laboratory and a work shop for rough work.

Part 5

Part 6

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Nokia Siemens Flexi BTS base station teardown: Power amplifier (part 1 of 2)

Teardown of a Nokia Siemens Networks Flexi BTS base station. This have been in service as a 6 antenna GSM system for mobile telecommunications.

GSM/EDGE, WCDMA/HSPA and LTE capable. 2×40 Watt output power.

also a picture of me pointing at where a remote radio unit or base station amplifier is usually mounted. Technically seen this is a TMA (tower mounted amplifier)

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Eaton PowerWare 20 kVA UPS teardown

Here is a little quick, dirty and early morning junk yard teardown of a 20 kVA Eaton PowerWare UPS system.

I have earlier taken some of these systems apart and you can see the differences from there photo galleries:

File archive

File archive

File archive

Other UPS teardown videos:

Teardown of a Eaton PowerWare 60kVA UPS system

Teardown video of Eaton PowerWare 30 kVA UPS

Teardown – Eaton Powerware 30 kVA UPS

Teardown of a Merlin Gerin Pulsar ESV 22+ UPS

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GE AMX-II, mobile 110kV X-RAY system teardown

Teardown of SCR inverter controller, driver and bridge for a General Electric mobile x-ray unit, the AMX-II. Features a 120V battery operated apparatus from 1979 which has a 60 Hz mains inverter and 500 Hz high voltage inverter. All analog controlled with completely custom made electronics.

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Hameg 8122 Universal Counter – teardown, repair and test

The Hameg 8122 is a programable universal counter / timer that has 3 inputs. Channel A and B from DC-150 MHz at 300 Vp-p and channel C from DC-1.6 GHz at 5 Vp-p.

I accidentally broke a knob off the instrument when moving and while I wanted to repair it, I might as well give a teardown of the unit. Finding a replacement part was not easy, but a cheap alternative solution was found.

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15000$ (1990’s) Sony 3CCD Analogue color camera giveaway! (shipping costs apply)

As a part of Dave from eevblog gave me the opportunity to reach a larger audience through the guest videos, I hoped that I found a new owner for this camera and that it would bring something good to another electronics hobbyist. Unfortunately I did not find anyone back then, so I will give it another try.

You can have this camera for free! You only have to pay for shipping costs and be within the few rules stated further down. Visit:

It is a Sony BVP-7AP Color Video Camera which is meant to be used with the CCU-355/P, this is the central control unit that would sit in a car with the satellite dish or be mounted in the mixer room of a studio.

It has nice viewfinder and properly a good shotgun microphone. It has a Fujinon 14x motorized zoom lens. It has 3 separate color sensors, hence the 3CCD brand, they sit in a optical filter for Red, Green and Blue.

It delivers a 720×576 lines PAL encoded signal, form the test output, the combined CCU output is a mix of picture, sound and internal communication on a special carrier frequency.

It has seen some water from bad storage, which never entered the electronics, but the UV filter behind the lens seems to have some glass pest and the exterior of the zoom lens and view finder has some aluminium corrosion. But it seems fully functional.

This is a heavy item (6kg) and shipping might be in the range of 60€ for Europe (even worse overseas), cost can vary from country to country, please ask for specific price if needed.

I will also include the DVR-USB converter and the dodgy software that came with it :)

The “contest” rules

0. Watch the video to get an idea of the electronics that is inside
1. Present a short description of a project that you want to use this camera for
2. Projects that will focus on digitalizing the analogue sensors for a new purpose will be considered front runners
3. I pick the winning idea on October 1st 2018
4. Show the result  on

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Teardown of a Eaton PowerWare 60kVA UPS system

This is the teardown of a large 2x 60 kVA Eaton UPS system, first is the teardown video and below are some pictures and a little description of the components.

Here is a picture of a single 60 kVA system installed with battery and inverter cabinets

I am not quite sure if this was really a 60 kVA or a 90 kVA unit, as the cabinet had both stickers on it.

The cabinets were unfortunately badly damaged from crane handling when they were thrown out into the junk yard. I managed to scavenge input rectifier, capacitor bank and 5 inverters from the system.

The inverter boards consisted of 10x FS35R12W1T4 IGBT 3-phase full-bridge modules, 6 of them used for the output and 4 of them for the intermediate / battery charge inverters.  For details of the boards see the video at the top.

The inverter boards were pure with only IGBT and DC bus capacitors, so they are suitable for hacking into something else, maybe it is just the relatively low 70 A peak current handling of the modules that limits its use for other applications.

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Huawei RRU3908 base station circuit analysis (part 2 of 2)

The Huawei RRU3908 is an outdoor Radio Base Station with one to four carriers and one to six sectors at 20/40 Watt RF output power per carrier.

Central Processing Units

Network communication is handled by a Freescale MPC8321 PowerQUICC2 CPU which runs at 200 MHz and has 2x 256 MB Hynix DDR2 RAM. It utilises a PMC QuadPHY 10 GB controller for the two optical input / output.

Decoding and encoding of the single bit streams for ADC and DAC are handled by the 3 Altera Cyclone III FPGA and the custom Huawei SD6151RBI controllers.

The single bit streams are treated by the Texas Instrument TMS320 series DSP CPUs. TMS320C6410 which is a fixed-point DSP that only calculates with integer numbers and the TMS320CT16482 1 GHz DSP CPU calculates floating point numbers.

Receive part

The input signal comes in two out of phase lines and are first treated by a Skyworks SKY73021-11 1.7 to 2.2 GHz downconversion mixer to get the frequency from 2.2 GHz to 550 MHz.

The local oscillator for the downconversion mixer is a Analog Devices ADF4110B.

A SIPAT SAW filter is used for isolation.

Depending on signal origin or type, I assume that the Analog Devices AD8376 Variable Gain Amplifiers are used before the signal lines split out into either a 3G ADC line or 4G ADC line.

The 3G line analog to digital conversion is handled by the Analog Devices AD6655-10 which is a 14-bit 150 MSPS chip that is specifically targeted for the 3G base stations.

The 4G line has a few more components as there is 2 MCL HSWA+1110 SPDT RF switch that feeds into 2 Maxim MAX2039E up/dowoconversion mixer and through a additional MCL HSWA+1110 SPDT RF switch it is handled by the Analog Devices AD9230-11-200 ADC which is a 11-bit 200 MSPS chip.

All timing is handled by the Analog devices AD9516-3 which is a 14-output clock generator with a built in 2 GHz local oscillator.

Transmit part

The single bit datastream from the Altera Cyclone III FPGA is handled by 2 Analog Devices TxDAC AD9788 which are specified for 16-bit 800 MSPS.

To get the signal up in frequency to the broadcast carrier frequency 2 Analog Devices ADL5375-05 upconversion modulators are used. These has a range from 400 MHz to 6 GHz.

The signal is then sent through a 5 staged ceramic resonator band pass filter.

Signal phase can be switched from the setup of transistors and EMC Technology & Florida RF Labs HPJ2F hybrid couplers.

The pre-amplifier before the signal is sent to the power amplifier is a Freescale MMG3004NT1 high linearity amplifier capable of 17 dB amplification in the range of 400 MHz to 2.2 GHz.

To control the signal strength a MCL 31R5 digital step attenuator sits before the output connector. This is a 31.5 dB attenuator that can work in 0.5 dB steps from a 6-bit serial control interface.

Power Amplifier

The power amplifier uses two stages where the first is a Infineon PTMA180402FL 40 Watt RF LDMOS that through a Xinger II XC1900A-03S hybrid coupler feeds two 90 degree out of phase signals to the output stage transistors which are NXP BLF6G20LS-140 140 Watt RF LDMOS.

The output is recombined in a Xinger II XC1900A-03S hybrid coupler before leaving to the diplexer through a circulator.

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Huawei RRU3908 base station teardown (part 1 of 2)

The Huawei RRU3908 is an outdoor Radio Base Station with one to four carriers and one to six sectors at 20/40 Watt RF output power per carrier.

Part 1 is the teardown itself with a walkthrough of different design highlights.

Part 2 is coming online in the following 1-2 weeks.

Part 2 is a complete circuit analysis and will also have high res pictures uploaded to this article.

For some different RF technology and techniques explained, here are some highlights from my previous videos.

Up/Downconversion explained:
SAW filters explained:
Ceramic bandpass filter explained:

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