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I will host another live session with focus on design, theory and compromises that has to be done in building Tesla coils, with special focus on the DRSSTC topology. First a quick look through design tools that I recommend, a introduction to my design guide and of-course answering questions all...

In this video I show how you can still make money on scrap computer parts without refining the parts yourself, so there is no use of chemicals, no tedious work in crushing and grounding parts, no burning and melting. Just a quick way of getting it exported with correct paperwork and get the...

This Wednesday at 2000 CET, I will perform a live stream on youtube to talk about how I started building Tesla coils, the journey that went on for 8 years which ended with me having a 3 meter tall Tesla coil that can do 4 meter sparks. Questions can be asked along the session.

Happy New Year to everyone! I have filmed a small new year special video for you all! See you all in 2018 for more high voltage exploration and experimentation!

Hi All I would like to share my growing collection of teardowns of RF technology that primarily deals with system, power supply, amplifiers, filters and antennas from cell sites / radio base stations etc. All the infrastructure that is necessary for your smartphone to work. This equipment is...

Hi All My name is Mads Barnkob, 35yo and from Denmark. I have been involved in amateur high voltage and general electronics for about 10 years now. Besides having owned a few handheld lasers as a kid, I have lately acquired laser modules from different old medical equipment or handheld...

Hello! I would like to invite, all those that work with or are interested in high voltage, Tesla coils and related electronics to join a new community driven forum, with special focus on scientific research in these topics. A community were newcomers can get help to build their Tesla coils and...

Hi All I found a Coherent CR-18U power supply which from the front panel looks like a 0-100VDC 0-70A linear power supply. It is a unit from 1979 and has a large 3 phase stepdown transformer to 120VAC and the regulation is handled by a massive array of water cooled transistors. I think this is...

Hi all This is my first post on the forum and this is also my first laser equipment. I am an high voltage enthusiast who mostly uses 4hv.org. This equipment all came from a laser scanner head that a part of a Agfa CompactPlus developer machine for large xray photos. The housing itself was not...