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mixos

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Posts posted by mixos

  1. During the retest of the simple modified high voltage polarity indicator, which apears to really make the high voltage arcs stronger and shoot further, the test i did in darker conditions seem to come up better in showing the arcs and the 2 lit leds when i think it should of been one, dureing the spectacular lightening storm on my desk, yes my desk as i failed to remember to get rid of the conductive contact paper covering my desk. and holding a camera and switching it on and trying to adjust the driver at the same time , and use whatever i can to hold 2 wires in position , but anyhow i used a peace of pvc pipe to hold the wire on with blue tac but some how dureing the photographing the pvc pipe rolled apart and i couldent beleave my eyes to see this really long purple arc shoot that far , with the hv optimizer circuit, it certainly gave the arcs greater distance, like a marx generator but in all the rush in trying to photograph it i ended up getting the photo wrong , but anyhow in the darker photo that came out the best, youll see the 2 leds lit up, the other darker photos taken to show the arcs better came out blury , remember i was doing to many things at the same time and in the middle of a lightening storm, the best insulated wire from the driver circuit to the flyback was arcing to the desk top conductive paper and other parts to untill i resolved it, the really longest arc when i tried to photograph it i messed up as got the wrong thing in the picture ,in the rush.







  2. In these 2 pictures retesting this simple modified circuit, to give led indication of hv arc flow from one wire to the other , was delayed by the 12 volts battery powering the flyback driver circuit,runing low on voltage. the arcs were so thin you wont see them let alone the red led lighting up, so ill redo the test when the battery is fully charged, the red when lite indicates hv dc , next test ill do it in a slightly darker condition , so you can see the red led lit up. this circuit is only the second out of 2.

    by Steven (received via e-mail)

  3. Dismantled view of a 6 to 96 led light chasser display

    In these pictures of one of 3 led chasers, i dismantled to salvage the needed prototype boards in one picture shows the long led mounting board with the small holes down the centre, which the small leds fit perfectly this long board is only one of 2 boards used the main board has the 555ic and electro and decade counter, this decade counter indentation ,that s supposed to mark the top left number 1 pin, is at the opposite end of the chip, making it look like its upside down, when its not, on the main board you

  4. This redrawn simplfied circiut from my collection was drawn ina special way by circiut maker and retraced in black to highlight it enougth to come out when photographed, for posting, ill post another similiar one soon and because it uses more of the 4017 decade counter pins, it allso makes a good decade counter testor.

    by Steven (received via e-mail)

  5. This light chasser , i used to power 96 leds and used it as a lotto number picker , by tapping to each side of the electro. and runing the wires to a push button switch ,enabled me to create a short when the button is pushed, this stops the leds in there tracks . where the numbers for the lotto was below each led . this was tried with the other light chasser. but may still work the same with this.the other version had a 105 poly in place of the electro and allso had a logic ic instead of the timer. so ill post that one next time.

    by Steven (received via e-mail)

  6. These 7400 ic testors i biult in 2 sections to make biulding them easyer , just add a push button and plug the 7400 ic into the socket and push the button to test, leds will alternate to indicate that the first section is working ok . to test the other section just plug the 7400 ic into the socket in the other circiut to teast the 2nd half of it , note the simplicity of the 2 section 7400 ic testor .

    by Steven (received via e-mail)




  7. In these 2 circiuts the components are the same as that of the 741 ic testor except that they test each 741 ic out of 2 , in the 1458 ic chip , the wireing to each ic socket where the 1458 ic plugs into is the only different thing, youll notice , apart from the location of one push button and slide switch, and the error writeing at top identifying them both as tester one and one when its meant to be 1 and 2 plug the 1458 ic into the first socket , then slide the switch on. one led will come on, then slide the switch off and push the button, the second led will come on, indicateing the first 741ic in the 1458 ic chip to be working ok .

    Then plug the 1458 ic into the second socket and repeat the testing procedure to test the second 741 ic in that 1458 ic. the same testing proceedure aplies to the 741 ic testor

    by Steven (received via e-mail)








  8. Concerning this circuit I have the same thoughts as for the op-amp tester!
    Ante ::)


    Please don't post unusefull messages! Here is not a chat room but a forum to express yourself circumstantial ! Help us to maintain this forum clear and in a high quality state. Note that unusefull messages will be deleted with not a prior notification to maintain the database clear.

    Hope to understand this!
  9. 556 IC tester

    These are broken into 2 sections, one 556 tester will test the first 555ic timer within that 556 timer ic, plug it in push the button and the 2 leds will alternate telling you that the first 555ic timer within the 556 timer chip is working ok. plug the 556 into the second 556 ic tester, push the button, the 2 leds will alternate telling you that the second 555ic timer within the 556 timer chip is working ok

    by Steven (received via e-mail)




    555 IC tester

    This 555 tester ,which can allso test the 7555 is realy handy, especially if you need to know if the timeres are working after you exstract, the timers from electronic junk, and for use in ignition coil and flyback driver circiuts by adding a push button and using an ic socket, just plug it in and push the button to test, the 2 leds will alternate to indicate the timer is working ok

    by Steven (received via e-mail)


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  11. R4 on the right hand side of this circiut is a 1k resistor. this simple circiut. has an intergrated circiut socket to plug the logic ic into, use a push button switch , to switch it on to test. the 2 leds alternate if the logic ic works , very handy to have and if your installing it into a circiut box ,use pins or matrix pins in place of the ic socket, on the main board and run them to an ic socket mounted onto an ic socket board which can protrude through a square hole filed into the box pannel ,so that all you have to do is plug it in and push the button to test the logic ic out

    by Steven





  12. In these pictures one is the microwave oven motor generator conected to a 19 stage voltage multiplier which consists of 3kv ceramics and 1n4007 diodes, and in the other picture when i rotate the shaft peace of the motor with the use of a hanky chief to hold the plastic thing which slips onto the motor shaft, i get good arcs of electrissity between the 2 wire , which attach to the voltage multiplier circiut. the arcs can get better but i was lucky to get this one ,as setting the camera to take a picture while i crank the motor generator, aint no easy task.

    by Steven





  13. http://www.datasheetcatalog.com
    http://www.datasheetarchive.com
    http://databook.stts.edu
    http://www.datasheetlocator.com
    http://www.xs4all.nl/~ganswijk/chipdir/index.htm
    http://www.icmaster.com
    http://www.findchips.com/avail
    http://fileshare.eshop.bg/
    http://62.236.156.23/ideaport/d/

  14. With the counter balenced swinging arm sitting on the pivot needle ,with its magnetic needle sitting midway inside the contact coil switch it on. any magnetic feilds or ground vibrations like an earth quake can set it off. once the detector goes off it will continue sounding till you switch it off and reset the detector so the needle is set in middle position through the contact coil without touching it, then switch it back on again. the electronics section is housed at the narrow end of the detector plattform it is afixed to ,this is made of wood in a near long tryangle shape , so that the electronics section is at a reasonable distance from the swinging arm peace. it runs off a nine volts battery.

    by Steven




  15. by Steven

    Here is the flyback transformer installed onto the home made pvc suporter allready fitted. into the circiut box




    First the power input, and on off switch and power input led indicator are installed, and the intergrated circiut socket mounting board with its wireing done, and the prototype board leg posts are in place. and the 25k and 10k pots to,




    Here is the component board with its components fitted, the mosfet and electro are at the rear of the box:




    Here the component board tinned coper wireing tracks are all solderd in place and continiuity checked:




    Here all the wireing from the ic socket mounting board and 10k and 25k potentiometers and the inputs are solderd to matrix pins or substtiutes on the component board. no wires are solderd directly to the board, so resoldering any wire that comes off is a super simple job.




    Here is the rear view of the component board for the flyback driver circiut.




    In this picture showing the wireing the n channell mosfet wireing hasent been done yet till i get a terminal strip for its wires and mov sitting in the box:




    Here at the rear of the home made pvc circiut box is the n channel mosfet attached to a heatsink ready for the wireing to it to be done . next to it is an exsternal 2200uf 50wv electro in a specially made home made pvc electro holder , in the case of a short these exsternal components are easy to replace:




    In this picture the high voltage positive output terminal and the black high voltage return are in place, along with the home made decal work.




    in this picture the flyback transformer wireing is done. the heatsink on the component board is for the 1500 volts protection diode allready in place. the last thing to do before testing is to get the tag strip that goes onto the bolt behind the rear pannel at the back of the mosfet, the mosfet wires go to it then from there to the mosfet pin positions on the component board, and the mov goes from drian to source on the tag strip, for the mosfet wires:




  16. That means that step input is :

    | 1 , t>0
    u(t)= |
    | 0 , t<0

    u(t)
    |
    1 |--------------------------
    |___________________ t
    0

    Right?

    Your system is this:

    INPUT : x(t)= u(t)
    OUTPUT : y(t)= impule response (unkown?)

    The relation between them is y(t)=h(t)*x(t)

    but h(t) can't be calculated easily right away... so you work at the frequency domain, where:

    INPUT : x(s)= L [u(t)] -> x(s)= 1/s (where L is Laplace tranform)
    OUTPUT : y(s)=H(s)*x(s)

    So IF you know (or can calculate) H(s) of your system then you can find y(s) becuase x(s)=1/s. Finally making reverse Laplace transform (L^-1) of y(s) you can find y(t) which is the IMPULSE RESPONSE:

    y(t) = (L^-1)[y(s)]

    Do you know H(s) or can u calculate it for your system?

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