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  1. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Nauman Muhammad . . . . . After adding the diode converter is ready for use? Only, after you make your "wild" wiring solder connections correct. In my looking at the 4 wires soldered to the circuit board that were being made by the FACTORY worker, I only approve of the quality of...
  2. 73's de Edd

    How to modify 12-24v car phone charger?

    O.K. . . .then, to get that units output voltage up just above 9 Vdc, we need to add 1 more series diode in the string. Find the third diode up from the RED wire DC power input of the board. That is being the third solder joint up on the right half of the board. Heat that solder joint and lift...
  3. 73's de Edd

    Backlight Screen problem AIWA 999

    I was also hoping that your problem would just be a lamp (s) replacement, but after fully researching your unit, a more sophisticated display was found. I just have a feeling that the problem is not to be with the lower AC used for the filaments of the display, but with that minus 24 volts DC...
  4. 73's de Edd

    Backlight Screen problem AIWA 999

    . Sir nangeo . . . . . . . A cursory examination reveals that your illumination failure is not going to be a "burnt out lite bub" from a backlight illumination source. BECAUSE your unit is using a VFD . . . .Vacuum Fluorescent Display unit. Referring to the attached informative schematic...
  5. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Nauman Muhammad . . . . . . . Okay, it looks like the wiring is in place, and we just now need to do a little quality refinement to it. Let's just start with the very top black wire, for a rework. Cut another black wire just a little bit longer than the present one, strip both ends...
  6. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Nauman Muhammad . . . . . . . I need to break the circuit at pink marks? Yes, use a single edge razor blade, Exacto hobby knife, surgical scalpel or SHARP pocket knife and cut two lines, side by side, in the copper foil, about the width of a metal paper clip and then peel the strip...
  7. 73's de Edd

    Korg MonoPoly not powering up.

    . Sir Electronicaz . . . . . . . Find ye olde power cable and track down and then check out within my yellow circles over near the BIG " powerful" transformer for the unit. Then track down and see if the +15 volts DC and -15 volts DC and 5 volts DC are coming out at those test points being...
  8. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Nauman Muhammad . . . . . . . Yes, that regulator is indeed being a 6 volt unit, so that is just less voltage that we will have to drop. Consulting the mark up: It will need 4 foil paths to be cut enough to leave gaps. they are being marked in PINK I just color coded the...
  9. 73's de Edd

    Soldering Problem

    Sir Shawn . . . . . . . IC8001 and IC8002 . . . . .aka . . . . . STK392-560 How lucky can you get! Seems like you don't . . .and won't . . .have to worry about pin 3, as it is totally not being involved in your convergence circuitrys scheme of operation. That pin 3 just floats . ...
  10. 73's de Edd

    Pot for throttle control

    Sir Cccf . . . . . . . Plus, how does your overall concept compare against this 36 Volt 500 watt powered unit ? With yours being . . . . .more or less complex ? 73's de Edd
  11. 73's de Edd

    Pot for throttle control

    Sir Cccf . . . . . . . (you need to buy a vowel . . . . .and would you prefer an A or an E ? ) Why don't you use some professionally constructed unit that has already been made, and specifically alter it to your needs ? Mass referencing...
  12. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Nauman Muhammad . . . . . . . You say: Furthermore what to do for 9v 600mA output instead of 6v 500mA output. When I reread my earlier supplied text . . . .I don't know if you interpreted it correctly, but the idea now is to modify the EXISTING LM7805 regulator to make it regulate to...
  13. 73's de Edd

    How to modify 12-24v car phone charger?

    . Sir Bauman Muhammad . . . . . Oh NO! ! ! . . . . .we forgot the parts procurement situation. It looks like the large diodes in series are being 1N4001's What we will do, is only use the first series diode from the battery line to provide isolation and then we will surgically cut apart the...
  14. 73's de Edd

    JVC AX-R551X PROBLEM

    .. Sir Constantine . . . If that unit has been well "cooked" thru the years of use, check out these particular areas of power devices. They are being pointed out with YELLOW MARKINGS . . .particularly . . .C . . .area. If any crystallized joints . . . .optimum procedure would be to pull...
  15. 73's de Edd

    How to modify 12-24v car phone charger?

    Sir Nauman Muhammad . . . . . Much better choice . . . . as being compared to the latter unit. Change that upside 3 terminal regulator from a LM7806 to a LM7809. The input of the charger will accommodate your potentially higher DC input as it is. I see that your slow boat / or / camel caravan...
  16. 73's de Edd

    JVC AX-R551X PROBLEM

    . Sir Constantine . . . Look at C910 (1uF 50V)... I replaced it just in case but nothing changed That's EXACTLY what I would have done also. In seeing that ripple value, which is being 1/3 of the supply's DC voltage output. Still referencing Adobe page 39. Overall you see them them going...
  17. 73's de Edd

    Circuit diagrams of TORO DDC-4

    Mme zulu . . . . . I am now seeing your new voltage readings, which you have taken on pins 1 and 16 of the relay . It looks like Pin 16 of the relay will be the dominant power pin, of which, one would normally expect almost 7 volts of DC supply being across it, but something seems to be...
  18. 73's de Edd

    Power Supply Help

    Ahhhhhhhhhhh yes, quite familiar with the "7500" . . . . . . . "other" controller, also. How about the POWER devices at the end of the board, that require the heatsinking. 73's de Edd
  19. 73's de Edd

    Mystery part

    Alright you can now see that it is a given that the rear portion is being a single pole single throw switch. Now, If you want to further differentiate on the potentiometers type , you will be finding that it has a 270° rotational range, now find the center of that range at 135. Now measure...
  20. 73's de Edd

    Power Supply Help

    I would guess that you are leaving the full wave bridge in circuit and testing . If this is the case, move the slide switch up to the 230 position, this will take the electrolytic capacitors out of circuit .Be sure to return the switch back to 115 after testing. Confirming your test procedure...
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