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  1. 73's de Edd

    Looking for components to make an IR controlled robot

    Sir Robert Hill . . . . . If you are not liking RF intercommunication . . . .I.R. interfacing should be an abysmal failure, in comparison, with a "moving target" consideration. You just need either better antenna interfacing on the T-R units OR just units with a bit more RF output on the...
  2. 73's de Edd

    Vintage Elka Reverb III

    . Sir Tomasz . . . . . That cabling really makes the circuitry hard to see, but for our initial preparation, can you get a shielded line to go to either a guitar amplifier or an amplifier . . . if that is what you're using . . . and one end will plug into the amp the other and will be able...
  3. 73's de Edd

    Standby Protect Aiwa Cx-gv30hr

    . Sir muhamad. . . . . . . Of your very first consideration, would be a voltage check of the marked in two YELLOW test blocks areas of their voltages, to see if the power amps + and- 21 volts of each of the power amps are balancing out to ~ 0 VDC by proper biasing of the individual...
  4. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . The only thing that I might consider, is that if it was tinned and was left running hot so long that it lost its tinning. If it is still shiny, it should still melt solder when it is being applied to it. Also . . . . . . try dampening a cellulose sponge...
  5. 73's de Edd

    repairing an amplifier

    Sir konkas. . . . . . . It looks like it's not being a HIGH power amp . . .in its only using a 3055/2955 output pair. SO . .if it didn't take out either of their 1,25 amp . . . . +33 and -33 supply line fuses, they were not heavily involved. You just might be lucky in only having to...
  6. 73's de Edd

    Technics RS TR 373 tape doors won't open

    Sir art blank . . . . . . . But . . .BUT . . .BUT . . .BUT . . .that thing is getting old and feeble and you shouldn't expect it to be on duty 24/7 for your beck and call for opening its door for you ! . . . . . after all . . . . .and that's being spelled with a HEAVY . . . . A l l l l l l...
  7. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . AN AFTERTHOUGHT: You need to go back and reread my previous post for an add on. Relevant to this post now, is the suggestion that you go to some " known resistances " on the power supply and test your ohms reading capabilities with your new meter. R8's color...
  8. 73's de Edd

    Newbie needing help with amplifier problem

    Sir Keyhall . . . . . . It's good to know that your unit is using standard leaded capacitors instead of that surface mount type, which I showed you .( Those were hard to replace / work with. ) First of all let's get you COMPLETELY straight on those LM337 " transistors " , as they are...
  9. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . Unless you typed in the wrong numbers above NO WAY would as low of a value as 7 decimal 6 ohms be used. Sir duke37, was interpreting the 2.2K and 3.3 K as actually being the units existing R7 and R6 values, while that was not their values.. Actually...
  10. 73's de Edd

    Newbie needing help with amplifier problem

    Sir Keyhall. . . . . . . I was not absolutely, positively,112% certain of any casing configuration variant between an LM337T and its AT version . I was expecting both to be leaded, thru hole mount TO-220 cases. Possibly you are experiencing /seeing a difference by virtue of one possibly...
  11. 73's de Edd

    Newbie needing help with amplifier problem

    Sires . . . . . . . MUSINGS: 1 . . .but U304 has different reading before and after the sound cuts off 2 . . .before after in -25v -25v out -8v -3v adj -7v -3v 3 . . .But Vadj seems to be controlled by Q307. If i'm right, you should read 1,4v at the base of...
  12. 73's de Edd

    Vintage Elka Reverb III

    . Sir Tomasz . . . . . Thank you . . .Thank you . . .Thank you . . . for the additional pics. With those new pictures, I can now see that the "galvanized sheet metal" was being the housing for the units reverb springs. Seeing better, what I initially thought might have been a round H...
  13. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . I am still in search of 4700 ohm resistor... Can higher one work? I think that the use of TWO resistors in series might even make it even EASIER ! Just find two values that will add up to that approximate 4700 ohm value. In my case I have shown 2200 and 3300...
  14. 73's de Edd

    Vintage Elka Reverb III

    . Sir Tomasz . . . . . By the looks of that unit, with its galvanized sheet metal construction, I can see maybe why there were only 500 units having been made . As far as the complexity of the circuitry, I am only seeing one integrated circuit and two transistors to the left of your number 4...
  15. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . With your info, looks like the better picture actually revealed R5 to be 220 ohms vice 22 ohms. The 3 terminal "IC" is actually being a MJE1300x family of power transistor, which Motorola introduced in the 80-90's and has been a mainstay since, in these...
  16. 73's de Edd

    220V to 12V 2Amp power supply modification

    My schematic at the bottom is just a " closer approximation " of actual circuitry to be found . .e.g. feedback controlled power oscillator. Compared to one using a UA 3824 series of S.M. controller I.C. 73's de Edd
  17. 73's de Edd

    How to modify 12-24v car phone charger?

    Sir Nauman Muhammad . . . . . . . I feel VERY strongly that if I were to disassemble your router and analyze its internal power supply design. What I would be finding is that your present 9VDC supply is going inside and getting a little initial filtering and then feeding into a 5 volt...
  18. 73's de Edd

    12V Rechargeble Fan Circuit Problem

    . Sir Nauman Muhammad . . . . . Now we can see that Camel caravan takes from May 11th until June 24th to deliver your new meter. I think that I will wait for your soldering expertise to improve before continuing on this unit . .for my part. 73's de Edd .
  19. 73's de Edd

    Magnavox VHS Movie Maker repair

    . Sir mdelzell. . . . . . . That IS the proper power input receptacle . . .you just have to realize that the power adapter / supply that it connects to also needs multiple other interconnects for audio and video inputs , as well as there also being a CH3/4 modulator and a battery holder...
  20. 73's de Edd

    220V to 12V 2Amp power supply modification

    Sir Nauman Muhammad . . . . . . . Until I saw this separate posting. . . . I was afraid that you just had a mere sealed wall wart . . . . this is a unit that we should be able to slightly modify for your needs.. Initially filling in on suppositions . . . . This circuitry design is just a...
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