practical hardware tips

  • Last Post 15 February 2019
Vidura posted this 29 May 2018


this topic is intented to post practical solutions for hardware, circiuts and more.

As i was working on a new powerstage for my pulsmotor project i made a short video about a quick solution for simple circuit boards. It's not a great deal, but can be quite useable in some cases.I also want to invite all builders to post their solutions for hardware building .

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Vidura posted this 27 June 2018

Coil former As here at the forum in many topics coils are needed I wanted to post this method which I often use to make quickly customized coils. First I take a core, or any material of the required shape and size and wrap a few turns of thin cardboard around and close with a bit of glue. Then I make the lateral retainer parts of a little bit thicker cardboard, cut the holes with the shape of the cores cross area section with a cutter and stick it all together with a bit of carpenter glue.

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Vidura posted this 27 June 2018

I found this method for making expirimental cores, I have planned to test with a few parts I 'll need for some experiments but will use metallic iron dust instead of black iron oxide.



Iron dust cores Powdered cores made of carbonyl iron have high stability of parameters across a wide range of temperatures and magnetic flux levels, with excellent Q factors between 50 kHz and 200 MHz. A popular application is in broadband inductors, especially in high-power applications.

Marathonman posted this 27 June 2018

I have 10 lbs of iron powder myself and wanted to build me some cores also to experiment with like with the Adams device.


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Vidura posted this 28 June 2018

MM. Also I had ordered 10lbs of iron powder #400mesh.😉 I don't understand the sens of adding charcoal like the guy in the video, but Some testing should bring more knowledge about the behaviour of different mixtures, I also thought to dilute the resin for better penetration between small particles, to provide insulation between them, I think have read in one of your posts that you are experienced in resin works, so if you can give some tips about dilute epoxy resins will be appreciated.

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Vidura posted this 14 January 2019


@ Wistiti and all, here the schematic of the switch I was using in many experiments:

PS if you add a gatedriver IC it performs better with less ringing, anyway with a functiongenerator  10-15v it is also OK.


here my custom pcb versionwink


Vidura posted this 14 January 2019

For the 0.033 ohm resistors i have used short lenghts of stainless steel welding rods( 1.6mm diam. x 1 inch for this value) and welded copper wires as connectors at the ends( silverwelding), because i couldn't find suppliers for this values. In theory the RDS on resistance should be enough for balancing the currents,  but in practical application there blowed one or two of the mosfet's with currents near the limit without them. this switch is capeable to work upto 450v and 20 A continuosely. i forgot to put the two 0.1 uF caps in the schematic, they are in parallel with the electrolitics to smooth short spikes.

later I'll post the CAD_CAM files if somone want to order machined PCB's


Wistiti posted this 14 January 2019

Thank you for sharing! It is appreciate. 😁

fer123 posted this 14 January 2019

Thanks Vidura for shearing your PCB. smile

Vidura posted this 15 January 2019

Here I have revised the design and added the driver IC on the board. It can be used with or without the driver IC. If J4 and J10 are bridged it works thru the Driver, also a RC filter can be used between the connectors if needed, the PCB can be used with two different capacitor sizes(C1-C5 or C10- C13) for higher voltage rating the big package might be needed. Heatsink for the Mosfets is important for good current capability. Find attached the CAD-CAM files for order PCB's if you wish.

Regards Vidura

Attached Files

Vidura posted this 15 February 2019

Hi all,
I was working on hardware needed for some of my proyects, and found this very simple self-oscillating driver circuit. It is capable to drive a half bridge with floating hi side drive up to 600v rail voltage and makes a very easy to build square wave oscillator. It makes a 50% duty cycle signal approximately, as it has a built in deadtime of 1.25uS; above 100khz this reduces the duty cycle significant , the limit is around 275khz where the deadtime cancels the signal completely. The drive capability is with 2 A peak not too high, but with low gate charge devices it works very well with about 150ns rise- fall time.

This circuit was originally published by DanyCZ as a simple Solid state teslacoil driver, I have changed some components, and planned to test it in a swimming pool ozoniser, where the spark gap device in long term operation is not very reliable. I think it could be useful in many applications where a resonant drive of a tank circuit is required, and the limited adjustment possibilities are acceptable.

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Weeks High Earners:
The great Nikola Tesla:

Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe. This idea is not novel. Men have been led to it long ago go by instinct or reason. It has been expressed in many ways, and in many places, in the history of old and new. We find it in the delightful myth of Antheus, who drives power from the earth; we find it among the subtle speculations of one of your splendid mathematicians, and in many hints and statements of thinkers of the present time. Throughout space there is energy. Is this energy static or kinetic? If static, our hopes are in vain; if kinetic - and this we know it is for certain - then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature.

Experiments With Alternate Currents Of High Potential And High Frequency (February 1892).