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  1. 73's de Edd

    Transistors

    Sir bill999 . . . . . I have good enough documentation here, to work with easily. That is not being too much of an antiquated unit at all. It's using "common as dirt " . . . . most honnable . . . Japonie . . . " silicron tlansistors ". 2SC1222------2SA640------2SC1247A and 2SC945. Now, of...
  2. 73's de Edd

    Output voltage is higher than it should be

    Sir pharaon . . . . Looks like a bit of familiarization with components used on your board are now in order. In looking at your last photo I am seeing the derivation of 5 VDC---3.3VDC---12VDC and 23VDC from this power supply down at the bottom WHITE connector. ELECTROLYTIC CAPACITORS . . ...
  3. 73's de Edd

    Output voltage is higher than it should be

    Be sure that the polarity is not reversed on one or more of your capacitor installs, or having a bad capacitor if used capacitors are being used . Also do a power off test of all of your diodes, particularly the one associated with rectifying the 3.3 VDC supply.
  4. 73's de Edd

    Output voltage is higher than it should be

    Sir pharaon . . . . . NOW, look closely at the top of that cap . . .wouldn't suspicion anything at all . . . would you ? People tend to discount that internally heated and thus vaporized electrolyte can "blow by" wire leads and the seal of a loosened neoprene plug used at the bottom of the...
  5. 73's de Edd

    Output voltage is higher than it should be

    Sir pharaon . . . . . This is what I suspicion . . . . . . over an extended time period of use . . . has happened with that unit of yours . . . . A RUN DOWN OF ITS OPERATION . . . . Referencing to the supplied FAIRCHILD tech application note, to then have its reference schematic...
  6. 73's de Edd

    Hartung amplifier project

    Sir Ian Mason . . . . . ? ? ? ? Did Sir Trevor show you his RED tractor . . . . .or forbid . . . .even let you strip its gears in a test drive ? THE HEADPHONE AMP . . . A first step might be to just work with one channel and initially confirm if you have the two supply voltage levels...
  7. 73's de Edd

    Electricity Consumption for Ceiling Fan?

    Factiod . . .or . . .just an oid ? https://www.guide2dubai.com/living/expat-life/dewa-utility-bills Does 20 fil . . . . or 2 cents per KWH . . . . seem an unreasonable electricity cost. Bryan do these figures seem to hold true for your situation ? Surprised by the overall average of...
  8. 73's de Edd

    Replacement A Board needed.

    Sir Twisted4465 . . . . . Also there is no fan on this unit which I find weird. . . . . . FANS are being plural . . . . . as in fans A . . .B . . .C . . . and D. PLUS that thing is a PLASMA and those mothas run HOTTTTT . . . . owning one of those is like having Mamma Cass's clothes iron...
  9. 73's de Edd

    Solar Drone

    Oh Boy :rolleyes:. . . . . . this is right in the "PERCEIVED" concept theory of a gnat running at breakneck speed on a hamster wheel and it POWERING a Corvette dragster . . . . .except with its misunderstood solar capability / weight/ power aspects. Drones eat up a HELLUVA-HELLUVA-HELLUVA...
  10. 73's de Edd

    Replacement A Board needed.

    With it all put back together will it even come on and play for a bit 10 blinks is typically related to a power supply problem or OVERHEATING Are there 5 fans at the top of the back of the set ? ? ? ? ?
  11. 73's de Edd

    What type of capacitor

    Sir Jerigorn . . . . . How about going thru these possibilities on this pre- sorted list, and since only you know the dimensions and size limitations to fit within the available space . Then pick one that will fit your physical size limitations and lead spacing's. (Even refer to the data...
  12. 73's de Edd

    MCS 3847 Integrated Amp Noisy Left Channel

    Sir KilgoreCemetery . . . . . To me, the most interesting part right now is how loud the noise is on the Phono Input. Even when the output is dead silent, it's crazy loud. Look back at my post #45 and the illustration of the signal flow path. Assuming that you are now having the LEFT input...
  13. 73's de Edd

    Water level sensor

    I could only see two things causing a shock . The first thing would be the opening of a set of relay contacts which would only be at that instant of opening. That would be taken care of by the diodes shutting the relay coils. The second situation would be any significant AC leakage through...
  14. 73's de Edd

    Water level sensor

    Sir Karthik rajagopal . . . . . . . True, the EMF will only pop up at a relay opening time . . . . . . .which you will have damped with those diodes installations. NOW . . . to move on to the crux of the situation . . . . I read only 12 v which was the power supplied from my 12 v adaptor(...
  15. 73's de Edd

    Water level sensor

    Sir Karthik rajagopal . . . . . . . GADZOOOOOOOKS ( and that's being heavy on the ooooooooooks ), now what a wicked web, you DO spin . . . . . Looks like you have just met inductive back EMF . . .say hellooooooooo. Try those two diodes shown . . . . . 73's de Edd . . . . . .
  16. 73's de Edd

    Beginner circuit problem

    Sir Bnalex, Ditto on the incandescent lamps current pull . . . .just put a 330 ohm in series with said LED and put it across the 9VDC and the way it lights up, is being the proper polarity, no risk involved with the LED. I had considered you having come in with a tested schematic from a...
  17. 73's de Edd

    Need help with Power Transistor ID.

    Sir Robert132 . . . . . Seeing that you only give me Rotomola and the rf clue . . . . . . . . now I DO " NOES " my Rotomola but apparently their rep DOES NOT ! . . . I now give you . . . . . . 73's de Edd
  18. 73's de Edd

    What polarity is this?

    Et al . . . . Indeed . . . . if you do encounter a " DC BARREL JACK " connector involving a dual DC supply capability, this is the circuitry wire up that is expected to be found.
  19. 73's de Edd

    Panasonic SA-PT670 CD player and surround sound

    Sir KeepOurFreedoms . . . . . Oh Tayyyyyyy . . . . so you found BLUE F1 intact . . . . which also could have been tested between the AC line cord prongs and looking to read that 3.9 megohm just past it, IF the fuse is not blown. Next due consideration would be the Main power supply in the...
  20. 73's de Edd

    What polarity is this?

    The unit shown SHOULD be the MAIN unit since it is needing the power. I see the RCA with the arrow as being the amplified low impedance audio that needs to flow over to the sole speaker enclosed within the other satellite enclosure . We are CERTAINLY going to need the FULL MODEL and BRAND if...
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