Author Archives: Mads Barnkob

About Mads Barnkob

Electrician, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics.

CM600DU-24FA IGBT – Removal of RTC over-current protection

The real-time current control (RTC) that can found in some IGBT modules is a protection against short circuits in f.ex. motor drives where they could have been used. The conditions on which the RTC acts is however sharing area with … Continue reading

Posted in Electronics, Tesla Coils | Tagged , , | Leave a comment

Kaizer DRSSTC III update #6 – First full power test after removing RTC

After cutting out the bonding wires to the RTC circuit of the CM600DU-24FA IGBT bricks, which we thought could be one of the reasons that we were not able to trip the 1500 A OCD setting, we had a short test … Continue reading

Posted in Tesla Coils | Tagged , , | Leave a comment

Astro HVO-Vario G 38, teardown of a 862 MHz cable TV amplifier

These are highly modular cable TV amplifiers, they are set up by using a wide range of different insert cards with different frequency ranges or options. These are 38 dB amplifiers in the range from 47 to 862 MHz. This … Continue reading

Posted in Teardown | Tagged , , , | Leave a comment

Finished project: Merlin Gerin PM700 power meter

Two days ago I conducted the first successful resistive load test of a 3 phase power meter that can measure voltage, current, power consumption, harmonic distortion and power factor. Read all about the construction and see all the pictures and video … Continue reading

Posted in Electronics | Tagged | Leave a comment

Finished project: 3 phase 13A Lübcke variac

Yesterday I conducted the first successful resistive load test of a 3 phase 13 A variac stack that has been enhanced with safety and monitoring options. Read all about the construction and see all the pictures and video demonstration here.

Posted in Electronics | Tagged , , | Leave a comment

Winners of a DRSSTC UD2.1 board

Seven users entered the lottery for a board by leaving a comment with a email address and through a gentleman agreement subscribed to the various channels related to this site. Two random numbers have been drawn between 1 and 7 using … Continue reading

Posted in News | Tagged | Leave a comment

Win a DRSSTC UD2.1 board for just a like/subscribe

I got two spare DRSSTC driver boards and you now have the chance to one of them home. It is a Steve Ward UD2.1 board as you see in the picture, with free shipping. All you have to do is … Continue reading

Posted in Tesla Coils | Tagged | 11 Comments

Nokia Siemens Networks Flexi WCDMA teardown: Antenna (part 3 of 3)

Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station for use in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 1: System station and Part 2: Power amplifier This … Continue reading

Posted in Teardown | Tagged , , , , , , , , , | Leave a comment

Nokia Siemens Networks Flexi WCDMA teardown: Power amplifier (part 2 of 3)

Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station for use in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 1: System station and Part 3: Antenna The following … Continue reading

Posted in Teardown | Tagged , , , , , , , , | 1 Comment

Nokia Siemens Networks Flexi WCDMA teardown: System station (part 1 of 3)

Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station for use in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 2: Power amplifier and Part 3: Antenna In the above picture … Continue reading

Posted in Teardown | Tagged , , , , , , | 2 Comments