Hardware Discussions

ZVS circuit improvements

2024-04-16T01:32:02.5330000

Hi, here I will share a circuit which gave me great results in various implementations. For sure you all know the selfoscillating ZVS circuits, you can find many of them on YT and the internet. the schematics are mostly similar to this ones below:

I have tried tham several times in different applications, while used with fixed pareameters and with good primary capacitors they work fairly good. But as I tried with some different kind of resonators, they began to fail. Most comonly the bodydiodes of the mosfet got damaged, or they failed to start oscillating causing losses in components and time, also the pullup resistors of the gates frequently got toasted. The cause as i figured out was the poor gatedrive with this very simplistic circuits. imagine that the gatecapacitance mast charge thru a resistor of tipically some houndreds of ohms. this becomes an issue at high frequencies. So I worked out a different aproach with improoved gate drivers. Also I added a blocking diode to keep the reactive currents away from the mosfet, and a voltageregulator for the drivers to be able to operate at higher voltages.

The image below shows one of this improoved circuits:

Here the schematic diagram:

A video with some more information:

https://youtu.be/mfqi14WCMkA

Voltage Multiplier

2024-03-18T01:36:27.6670000

Hello,

Something very useful for our experiments: a voltage multiplier.

Sometimes we have an AC transformer we could use in our experiments but we need DC voltage higher than the transformer can provide or a range of higher DC voltages we can choose from.

Well, we can build a simple circuit with capacitors and diodes to get a range of DC voltages from the output of that AC transformer like this:

https://www.youtube.com/watch?v=HV5gZRhytY4

More details about how the circuit works here.

In my Don Smith Effect experiments I use voltage boosters because they are cheap but if you have an AC transformer and a bunch of capacitors and diodes already available in your stock and you want to put them at work then you can make your own voltage booster for free.

Regards,

Fighter

Arduino driver and replication

2023-07-14T14:07:35.5430000

As some parts are still back order, I made a polyphase transformer like the Doc's with a potcore.

Instead of using an FG, I'm learning programming for the beautiful Aduino Uno R4 ,wich is the new one, it looks awesome and I'm going to activate the mosfets powered with this little marvel when I figure out C+ programming instead of an F.G.

For those familiar with Arduino IDE let me know.

This is the one i am talking about:

Jagau

RIGOL MSO5000 hack

2023-09-22T05:40:42.6670000

this is for everyone who wants to have full options on Rigol MSO5000 series...

1) download zip-file from this post.

2) extract and have a look at readme.txt

---
Update Rigol to Firmware 1.03.00.01
Data from Rigol Website: MSO5000(ARM)Update v00.01.03.00.01.rar (70,1 MB)
Extract DS5000Update.GEL (70,1 MB) and copy to USB-stick.
---
USB-stick (2GB FAT) - not every stick works for some reason...
---
On oscilloscope do a local update (USB).
Then reboot MSO5000
---
Delete content from USB-stick after flashing and copy 3 files on root of usb-stick.
01_03_00_01.bspatch (234 bytes)
DS5000Update.GEL (133,1 kB)
patch.txt (167 bytes)
---
Then do a local update on MSO5000 again.
follow instructions on screen.
restart, done!

16.10.2023: i just updated all scopes to new 1.03.03.00 firmware. you can find archive as attachment.

enjoy

Obtaining a Specific Harmonic of a Frequency

2023-11-28T02:11:22.7100000

Hello,

Many times we want to obtain in our devices a specific harmonic of our input frequency and in order to do that we can build a frequency multiplier:

A frequency multiplier is an electronic circuit that generates an output signal and that output frequency is a harmonic (multiple) of its input frequency. Frequency multipliers consist of a nonlinear circuit that distorts the input signal and consequently generates harmonics of the input signal. A subsequent bandpass filter selects the desired harmonic frequency and removes the unwanted fundamental and other harmonics from the output.

Frequency multipliers are often used in frequency synthesizers and communications circuits. It can be more economical to develop a lower frequency signal with lower power and less expensive devices, and then use a frequency multiplier chain to generate an output frequency in the microwave or millimeter wave range.

And we can do that using specific diodes, for example below we have some frequency-doublers:

And the diodes we can use in building them (including their specs):

I'm attaching the document with details.

Regards,

Fighter

Portable Field Detector

2023-11-24T02:18:35.4930000

Hello,

I'm adding here the information about a portable field detector very usef in checking the level of energy in a certain area.

I think it could be very useful in checking the energy fields around our devices when they're functional.

The details are below in the document attached to this post.

Regards,

Fighter

230V, 100 Hz, AC, Pure Sine Wave, Power Source

2023-10-25T10:36:34.9000000

Hello everyone,

I need a power source that can deliver 230V, 100 Hz, AC, Pure Sine Wave. I searched the internet, but mostly because the standard is 50-60 Hz, you will not find it as a standard electrical hardware in stores (online and offline). So it is a "specialized" type of equipment and I did find something from https://novaelectric.com, for example, in the form of frequency converters, inverters and custom made power sources.

My question is: Does anybody know how to make a diy, solid state, power source that does what I just described? A square wave will also do for the moment but pure sine wave is preffered.

P.S.: I know Vidura is skilled in the arts, maybe he is around to help. By the way, Fighter, is there a option to tag people in comments?

Square Wave Oscillator Off-Grid

2020-08-13T01:14:07.0400000

Hi all
I would like to share with you this little square wave oscillator which works the same as a function generator and which operated on battery which can vary from 6, 9 or 12 volts DC according to your needs.

The heart of the oscillator is a TLC555 from the CMOS series which has very low power consumption and is completely different from the old NE555.

It has a 10K potentiometer to vary the frequency from 13Khz to 130Khz and another 5K potentiometer to increase the amplitude of the signal at will.

A drawing of the schematic that I present to you freehand

It can be easily changed by changing a single resistor and a single capacitor.

5 ma on 9 volts battery here

The particularity of this oscillator is that the output voltage changes from positive to negative through zero in the center. This is the AC square wave shape.

Most of these freely sold circuits are above zero volts they are only DC square wave and could not be use for experimentation.

Very low or high amplitude at your choice

This way you are isolated from the electrical network and have greater freedom of measurements without ground return.

I also hope for those who would like to join us and experiment with us and do not have a function generator, this is the ideal opportunity, easy to assemble and inexpensive.

Jagau

Magnetic pole identifier

2022-06-15T07:01:43.2300000

Hello everyone

I propose this electronic magnetic pole identifier.
Very simple to do.

In another thread I will upload all the hardware.

Thank you.

@ Fighter...

In the insert window it does not appear
the option to browse inside the local PC.
Please if you can implement it within the forum.

YoElMiCrO.