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  1. Kerrowman

    Measuring an NST Output

    I'm planning to measure the HV output waveform from an NST using a 1000:1 potential divider, which is yet to be built, and I have a few queries about the measurement setup. I have included a diagram of the proposed design and arrangement and where the small NST has a stated output of 1.5kV RMS...
  2. Kerrowman

    LC tank circuit with HV driver

    Hi there, I'm exploring resonance in LC tank circuits at radio frequencies and have a query about my observations. In the first picture, I have a 6šœ‡H coil and a 4.8nF cap in parallel, and I have measured the f(sr) using the setup shown in the attached. The result, according to the scope, is...
  3. Kerrowman

    Capacitor Charging with HV Pulses

    I have some queries regarding capacitor charging using inductively generated HV pulses, in contrast to with regular DC. First, to check my understanding, I will recount the situation with non-pulsed DC. If the energy supplied by the battery U = QV then the capacitor will always(?) receive and...
  4. Kerrowman

    Routing pulses

    What is the best way to divert some 0.5-1.7kV inductively generated flyback pulses from one destination to another and then back again after a short period without using a relay, which would probably be too slow and inaccurate to set the duration of the ā€˜divertā€™? Can this be done with an FET/...
  5. Kerrowman

    Using capacitors instead of batteries

    Hi there, I would like to know if I can use a large capacitor to store energy on the way that I currently do with an 18Ah lithium battery? Ā  My understanding is that with the minimal internal resistance of a capacitor, they can discharge their energy very fast even though the energy density is...
  6. Kerrowman

    Measuring circuit current

    Hi there, Ā  I am trying to measure the current in a circuit by putting a digital ammeter inline, as in the diagram, after removing a connecting link that is also shown. Ā  When the connector link is in, the circuit works fine but when the meter is in it doesn't work well at all, implying that...
  7. Kerrowman

    Computerised Battery Analyzer

    Hi there, Iā€™m looking for a computerized battery analyzer that will achieve the functions shown below and show graphical plots on a Windows 11 laptop in real-time. Ā  I have been looking at the CBA iV from West Mountain Radio that would have been fine and do all I need and at a reasonable...
  8. Kerrowman

    Circuit to increase CEMF spikes

    I have built a circuit for which the aim is to produce high voltage back EMF spikes from the Drain of a MOSFET so I can investigate some of the properties of these voltage transients. What I have built is shown in the attached circuit where I am using an IR2121 driver chip to encourage shorter...
  9. Kerrowman

    Looking for an Optical RPM module

    I have built a device that has a spinning rotor that I would like to display its rpm. I have been using a handheld laser device that bounces off a reflective strip on the rotor (see pic). Iā€™m looking for a permanent module attached to the base plate with a small display unit I can mount and...
  10. Kerrowman

    Rheostat power rating

    I have a circuit (see pic) that includes the primary winding of a 1:20 self wound transformer. Without some form of additional resistance this circuit will draw too much current from the power supply and damage the FET Iā€™m using so I plan to put a rheostat inline with the primary winding to...
  11. Kerrowman

    PWM-PSU Voltage Adjustment

    Hi all, I have a PWM power supply that has a nominal output voltage of 12V and a current capacity of 25A continuous. While there is about 0.5V adjustment on the PSU itself, I need to be able to adjust this output to supply 7-12V so I need to drop a few volts after the output. I will lose 1-2V...
  12. Kerrowman

    Detecting Resonance in an Electrolysis System

    Hi there, I would like some help with finding an effective way to detect resonance in an electrolysis setup that functions like an LC circuit. Let me lay out the full context and details. (The pics are not showing in the post in this order.) Ā  Pic 1 shows the flow chart for the setup that is...
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