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HaddyS

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  1. Like
    HaddyS reacted to audioguru in High Voltage low amperage   
    10,000V at 0.02A is 200W which is a lot of power for a little power supply.
  2. Thanks
    HaddyS reacted to Kevin Weddle in High Voltage low amperage   
    Generating a very high voltage with a small battery is an interesting idea. In theory, a transformer can produce any voltage, depending on it's turn ratio. They can also be cascaded. Are there any designs that utilize cascaded transformers, and if so, why isn't one transformer used?
  3. Thanks
    HaddyS reacted to Kevin Weddle in High Voltage low amperage   
    A transformer will deliver a high enough voltage that you want. High voltage transformers are expensive, but can usually be found in electronics products no longer used, and be cascaded for high voltgage. Be aware that high voltage burns and shock can occur, and a high enough voltage can lay you in the hospital.
  4. Like
    HaddyS reacted to Mhavskie in My ZVS Flyback Driver with pcb   
    This is my ZVS Flyback driver with pcb/desinged. It is very simple.

    ZVS Flyback Driver











    ;D
    <Y>
    ./'\.
  5. Thanks
    HaddyS reacted to Realbird in 0-30 Vdc Stabilized Power Supply   
    Hi,
    Just build this power supply.
     
    Works Ok but will blow output transistor instantly if output is shorted !
     
    Any suggestion
  6. Haha
    HaddyS reacted to Silent Jack in High Voltage low amperage   
    No, lead acid batteries are far too heavy.  I was looking at maybe NiMH or more likely some LiPo batteries commonly used on RC cars and the like.  Looking at 3-6AmpH class batteries.  Might lean towards 12V, since there is so much standard stuff for that as far as wiring and other components.  Safety is of course important and any good suggestions on grounding/shielding are welcome and appreciated.
  7. Like
    HaddyS reacted to Hero999 in negative ioniser   
    The same basic blocking oscillator circuit, normally used to drive a flyback transformer, can also drive a centre tapped or dual primary mains transformer.

    Here's an example of a capacitor charger using a mains transformer with a centre tapped primary. It should be able to drive a voltage multiplier circuit.

                        C1 1 uF                   D2 1N4948   R2                 +------||------+        T1    1.2kV PRV  1K 1W                 |              |           +-----|>|-----/\/\---+------o +                 | R1 4.7K, 1W  |   red  ||( blk                 |                 +-----/\/\-----+------+ ||(                     |                 |                  yel )||(                   +_|_ C2  + o----------------------------------+ ||(                    --- 300 uF                 |                  red )||(                   - |  450 V                 |      +--------------+ ||(                     |                 |  Q1  |                ||( blk                 | 6 to 12         |    |/ C                  +--------------------+------o - VDC, 2A         +----|    2N3055    Stancor P-6134             D1 _|_   |\ E           117 V Primary (blk-blk)         1N4007 /_\     |            6.3 VCT Secondary (red-yel-red)                 |      |  - o------------+------+


















    http://www.repairfaq.org/sam/samschem.htm#schssi

  8. Haha
    HaddyS reacted to keron in negative ioniser   
    Hi all,
    I am looking for a circuit that operates in 9-12 DC and will generate voltage in 2-3KV range with negiligible current. I came across many designs but interested if anyone knows any circuit that uses common step down transformer with primary and secondary reversed as the first step in conversion.I am planning to use Cockcroft–Walton multiplier to increase the voltage from transformer. Flyback transformers are difficult to find /not familar for me to use.But would defenitely consider if its readily available
    I came across this circuit and like to know if something similar can be tried with a step down transformer

    http://www.aaroncake.net/circuits/flampdrv.asp

    If anyone know any schematic with small flyback transformers I would be glad to try.I am only concerened about availability.
    The whole purpose is to make a negative ion generator to clean dust from my vinyls. I donot want to use the ones based on Pizo electric but somehing that will generate a massive negative ion flow that will neutralize all sticky dust on my LPs
    .The prime consideration is making it as small as possible.
  9. Like
    HaddyS reacted to pyrohaz in High Voltage low amperage   
    Possibly a flyback converter? They can usually be output current limited by limiting the current availiable to the transformer. Do you need it to be highly efficient or are you not too fussed?
  10. Like
    HaddyS reacted to audioguru in battery level indicator   
    The LM3914 in a DIP case is not made anymore. Buy them before they are all gone.
  11. Thanks
    HaddyS reacted to audioguru in 0-30 Vdc Stabilized Power Supply   
    The original defective circuit had many overloaded parts that will blow up. The improved version fixes it.
    Opamp U3 senses the output current in R7 and reduces the output voltage and output current to match the current set with P2. The maximum output current is 3.0A in the improved circuit and the two output transistors have a total maximum current rating of 30A so they will not blow up with only 3.0A. 
  12. Sad
    HaddyS reacted to ren_zokuken01 in Measuring low current on high voltages?   
    thought so.....  T_T


    what about my idea of a semiconductor device (somewhat like a diode)??
  13. Haha
    HaddyS reacted to zoro222 in Small vacuum tube Tesla coil   
    nice old fashioned work
    is it dangerous to touch the fling electrons ????
  14. Confused
    HaddyS reacted to Hero999 in Measuring low current on high voltages?   
    No never remove the fuse from the meter.

    The meter's insulation is only 1kVDC, if you try to measure 100kV, an arc will jump through the case which will both damage it and you'll get a nasty shock.
  15. Like
    HaddyS reacted to ren_zokuken01 in high voltage electric arc   
    i need to create voltaic sparks that jumps from one electrode to another between a medium of air. sort of like jacob's ladder. the distance of one electrode to another is about 0.5". i gather that the breakdown voltage of air for said distance is about 4kV. i'm targeting more of around 20-30kV, just to be sure. the sparks do not have to last long, just about 1 sec, max.

    the purpose of this simple contraption? i want to create a sustained jacob's ladder, rather than one lasting only a second (as the described contraption does). so what this contraption will do is apply the breakdown voltage, ionizing the air and then the sustained high voltage will be supplied by my DC arc welder that outputs 25V @ 50A. don't worry, i won't put the two to be electrically parallel to each other.

    the contraption has to be very cheap (would simply winding a step-up transformer be enough)?? i've tried different sources, the cheapest i found was simply buying a cheap stun gun (around $10-20) than can supply a few million volts -- pretty good. but the laws in canada does not allow the trade of any sort of weapon (even for self defense) whatsoever. i've tried looking at neon sign transformers but they cost at least $50.
  16. Like
    HaddyS reacted to mixos in 0-30 Vdc Stabilized Power Supply   
    I attach it here also for fast view...

  17. Confused
    HaddyS reacted to Hero999 in How to choose a high voltage relay   
    The current rating is not a problem. It's better to go higher than lower. Using a power relay to switch low current signals is only a problem at very low voltages.

    The problem with using a lower voltage relay is the contacts can arc over and what's worse it it could be unpredictable.The relay may seem fine most of the time but it could suddenly arc over due to ambient ionising radiation.
  18. Like
    HaddyS reacted to Jeremy in 0-30 Vdc Stabilized Power Supply   
    Ok, skip the voltage and current LCD panel
    With R18 = 33 kOhm I have got 4,7 A on out...
    U3 was replaced for another .
  19. Thanks
    HaddyS reacted to audioguru in 0-30 Vdc Stabilized Power Supply   
    Since it was years ago I do not remember which page of which thread has version 6 or 7. I have the schematic and parts list of version 6 here:


  20. Haha
    HaddyS reacted to repairman2be in 0-30 Vdc Stabilized Power Supply   
    @Jeremy
    You may have 2 PCB's for AU$5 plus shipping in an envelope. Two boards weigh about 44grams.
    Email me if you would like some to: [email protected]
    Cheere, William
    PS. Seems your Kit has a problem to start with. Before I found this Forum I ordered two Banggood Kits. It is still not assembled and probably never will be. Anyway, over at this page there is a lengthy description on how to improve the Banggood kit.
    "www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html"
     
  21. Thanks
    HaddyS reacted to juanpmoron in 0-30 Vdc Stabilized Power Supply   
    R16 is 1K and is OK
    ???
  22. Haha
    HaddyS reacted to MP in 0-30 Vdc Stabilized Power Supply   
    Think of the commas as periods or the periods as commas. These are used differently in different continents. It means the same.

    MP

  23. Thanks
    HaddyS reacted to elctro123 in 0-30 Vdc Stabilized Power Supply   
    So Finally which version of schematic is correct  / flawless  to  build the PSU ? 
  24. Haha
    HaddyS reacted to redwire in 0-30V 0-3A Latest Data Discussion   
    Arklite    take a look at this PS output at start up using current control.
  25. Thanks
    HaddyS reacted to adam9876543210 in Best Electronic Products   
    hi...
         welcome to the forum site. best electronic means that it will show the good features. good means working skills and new features because it explains product quality. I like [url=http://thefarmerworld.tk/agriculturetools.html] modern farming [/url]  features.
    ..............................................................................................................................
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