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Safety

When working with mains electricity or high voltage in general you MUST know and take all the precautions and follow all the SAFETY rules!

DO NOT work with MAINS ELECTRICITY or HIGH VOLTAGE circuits if you don’t know all the SAFETY RULES for working with high voltage!

When soldering ALWAYS WEAR PROTECTION GLASSES and other protection gear that might be needed!

Before measuring voltage with multimeter or other measuring device always check if PROBES INSERTED THE RIGHT WAY, and not for measuring current or other values other than voltage!

Think before you do something! Sometimes it helps ;-)

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11 comments

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  1. anglophony says:

    Nice blog with relevant informations , sir.
    I have you bookmarked and look forward to further readings.
    G’day to you

  2. Chiper says:

    Yes, really nice blog. I bookmarked too.

  3. Bjorn Sandvar says:

    Hi,
    I am a Norwegian-Canadian retired Marine Engineer. I live in Canada outside Vancouver, BC.
    I have been working as a Machinist, Welder, Engine Fitter, Sheet Metal worker and a few things more. Last thing I was doing before I retired, was that I had my own Appliance Service business.
    I have been experimenting with making Hydrogen Generators. Made one I put on my wife’s car but saved only about 20% of the gas consumption. I have been using a battery charger for my experimenting, and that is not good enough. My hope is to make an hydrogen generator that can produce enough to run the car on only hydrogen but I need some better equipment tor my experiments than the battery charger. Now I have read on the internet how to make a bridge rectifier, but I don’t know how to read this technical codes and signs. So her is where I need help from you.
    I have been watching your demo on the internet, and I am very impressed. To me it looks like it so easy for you as it is for me to read a book. You are also a very handsome looking man. What I was thinking about is a Bridge Rectifier that can take the 120 VAC from the wall outlet and make it in to so close to !20 V DC as possible. There was many guys on the net that could tell how to make a Bridge Rectifier but none of them was with high voltage, but you was the one that impressed me the most. Also most of them was low voltage. For what I am going to do I probably need some big diodes to and capacitor. Probably need to be able to take a load of about 30 DC amps out. Can you please tell me how to do this and what kind of sizes to use, and I will tell you how I am progressing, so you can drive your car on hydrogen too.
    Regards
    Bjorn

    1. Jason Benjamin says:

      Dear Bjorn. I suggest looking into an application for you computer called Multisim. You can test your designs here before you put them into play, even use meters to see currents scopes and the like. We use this app in Electrical Engineering classes. They also have exercises to help you understand what is going on with the current etc. I highly suggest this application if you are the least serious in building such a device. My major is electrical engineering. I fully understand what the young chap is doing here. Though I do think it would benefit him to use a coil to lessen the Voltage before hitting the Bridge rectifier. Each Diode in the bridge rectifier only allows current to flow in one direction. It also has a .7V drop against each one if wired in series the standard Voltage drop in series for a Diode is .7V nominal. Not sure if that is of any help. Also it requires 4 diodes. I typically use the 4001 numbered diodes for this procedure. Also coil tuned on one side to the other to a 4:1 ratio will get you in your ball park for the voltage you are desiring. That’s around 13.8V last time i did this experiment. The shorter the coil. The higher the voltage. Though the higher the voltage the more the EMI electro magnetic interference/Harmonics in the wave form. It is best to use capacitors as the young chap does often here to smooth out the wave form. Since capacitors absorb electrical energy or Voltage, and then release that energy over time. They have a tendency to smooth inanimate voltage spikes. Making the device more stable, and less likely to damage your device your attempting to build the rectifier for. To build a simple rectifier really all you need is a resistor, and a diode. Do NOT FORGET THE RESISTOR! typically 330Ohm is enough. Most engineering builds use 100Ohms at the least. It would behoove you though to get familiar with the power wheel, and Ohm’s law, and Watt’s law formulas. They would drastically improve your ability to perform this action. Lastly. Some symbols. squiggle line= resistor Arrow head with line is a Diode. The line represents Cathode, the opposing end is anode. It is very important you put the diode in the proper direction. Remember it is a directional device and at the Energy your attempting to creat it is likely to go into reverse breakdown if you put it in wrong and go up in smoke! The flat side of the diode generally around the bottom where it looks round generally dictates cathode or negative input. Thank you hope this was of help I know it’s long but have fun emulating your circuit sir. And I wish you luck in your venture. Energy comes in all ways. And hydrogen is very good sir. Only executable from that is water.

    2. Jason Benjamin says:

      Then again I guess a transformer would have the same effect now that i went in the other room for a cup of Joe. A transformer reduces Energy and voltage in the same manner as a coil. So my fault to the builder on that one either would work. This is the same reason they use them in power lines to lessen the voltage before it hits your home to around 440 amp panels.

      Remoteinstall-

  4. Nepal says:

    Sir,

    I have read one of your article with title “Using relay tip and tricks”. It sounds interesting and looks very helpful for the circuit i am thinking to build. The circuit in question is just about driving relay by manually powering the circuit using a on/off switch. However the relay turning on/off should be quite fast such that computer does not reset. If you can help me drawing this circuit i would be really grateful. If you require more detail i can share it to you.

    I wish if i could provide you a block diagram here but it is not possible as your homepage doesnot allows to upload the diagram. Below is one line diagram and requirement in brief, hope it is clear.

    Mains power 220VAC -> Relay NC point
    Genset power 230VAC -> Relay NO point
    Computer load -> Relay common point
    12 VDC Relay coil -> To be driven by circuit in question
    Power to relay and circuit shall be 12V DC

    The requirement here is, as soon as 12VDC is applied to circuit the relay must turn ON and when 12VDC is removed the relay must turn OFF but the relay switching must happen quickly (like UPS switchover time) such that computer or alike load doesnot restart.

    Hope i have clarified the requirement. I am keen to highligh more on the requirement if you need further details. Thank you.

    Regards,
    Basanta

  5. Samir Chandra Ghosh says:

    I want to add.

  6. Alex Faulkner says:

    i need help with my power supply thing. i dont have 3.3v sense but i have a brown wire labeled V.S and a creme colored one labeled +5V.

  7. Dennis says:

    ATX Power Supply to Bench Power, Problem finding a 5watt 11 ohm ceramic dummy
    Resister. Can you help on a supplier..DL

  8. Orlie says:

    I watched your videos in you tube and I find it interesting and eductional, I always follow your videos, it great you are educating a lot of people like me electronically. Keep up educating us..

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