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  1. 73's de Edd

    DSP Radio - Change of Ferrite Rod to improve RF gain and signal stabililty

    Sir Low Seng Kuang . . . . . "shivering"? I would interpret that as a very fast reception fade in and out. Its to radio reception . . . .hopeless . . . . as is adjunct thermal tremor, to telescopy. Since the front end on this unit is analog, it is handling RF in the same manner as the older...
  2. 73's de Edd

    Post-soldering August ep 650 headphones, bluetooth mode doesn't turn on. Any hope?

    Hmmmmmmmmmmmm . . . . . Look at photo # 2 where you can see it setting over there by itself, but it really goes over to he other side of the headset. Then look att photo # 3 where you see the little piezo beeper, at the right top corner AND a second set of RED and BLACK wires, just below, that...
  3. 73's de Edd

    Post-soldering August ep 650 headphones, bluetooth mode doesn't turn on. Any hope?

    Sir NeoJesus . . . . . Excellent initial introductory information and visual presentation. Now, after perusing over the info, it seems like you were always a diddling n' a fiddling with the AF output stages connected circuitry and either leaving it unloaded or shorting it out. Now the whole...
  4. 73's de Edd

    Kindle Fire 1st gen.

    Sir Nisar-von-Voltenbräackter . . . . My first unit is getting to be almost 4 yrs old so I guess that I will only HAVE to be going inside . . . . . for its eventual battery replacement. This is very complete info and the only comment I can make is to use a WELL tinned small tip and a soldering...
  5. 73's de Edd

    model s50FH - YB01 Samsung crackling noise

    Mrs Ann . . . . .dubl'ya It's going to be hard to just toss a weighty 50 inch Plasma set anywhere. The most needed initial info was the analysis on your part of the source of the origin of the offending sound within the internals of the unit. With you saying that it was NOT affecting the...
  6. 73's de Edd

    10A device to 5A supply?!

    Sounds like you will be getting pump action, when starting at a low tire pressure, but as the current demands start increasing, in getting on up towards that 70 ? lbs. Then the unit will slow down and stall out on you. With you never being able to achieve higher tire pressures. Try it and...
  7. 73's de Edd

    Electric Fence Charger

    Sir Richard C . . . . Top picture . . . Pity that this is just being a micro-tad . . . . out of the 1 year parts warranty ? I would see the large silver canned capacitor as being the " BIG BANG " poly capacitor which repetitively charges up, to then get discharged into the primary of the...
  8. 73's de Edd

    B or not to B

    AC-DC motors normally arc a bit at the commutator bar / brush contact unions, if you have some spray contact cleaner, direct a stream at those areas and see if the condition abates for that instant of the stream presence.. Also take note of the commutator bar oxidation conditions .. . are...
  9. 73's de Edd

    Philco Radio Parts Identification

    Sir KilgoreCemetery . . . . . I think that you lucked out on this one, as this is a '40 model and most of those blocks . . . the one of which you DID zero in on . . . . were more prolifically used in the '30' models. After laboriously checking out all that your pic would let me see, that...
  10. 73's de Edd

    Technics SA-CH550 panel very dim, is it fatal

    Sir diode84 . . . . It said WHICH units display being is of the most importance to you ? Probably time to give that one up. That's certainly being one lackadaisical attitude . . . without even knowing, that there are being two potential evaluative tests to see the degree of enhancement...
  11. 73's de Edd

    Technics SA-CH550 panel very dim, is it fatal

    Sir diode84 . . . . . I initially need a couple of answers . . .since this is a system concerning separate multiple units . . .am I correct that the dim display syndrome is being concurrent between ALL of the units? And if so, is there one unit in which this is being the MOST problematic...
  12. 73's de Edd

    Philco Radio Parts Identification

    Sir Kilgore Cemetery man , . . . . . Pic 1 is a widely resonant RF choke load in the plate circuitry of the 1st Rf amplifier . . .about 3.5 ohms resistance. It is identified as Item 13 See if your two olde tyme carbon composition resistors are the ones shown being in series from the 84...
  13. 73's de Edd

    Squawk Box

    Sir Kim . . . . . The base . . . . .d/678k2 . . . . . would make you want to interpret it by its full alphanumerical identifier of 2SD678,with that final end K2 suffix, referring to its beta spread / gain. Doesn't work . . . . . . . . . . as it then comes out as a one hefty big power...
  14. 73's de Edd

    Squawk Box

    Sir Kim . . . . . If you are now either fully stymied or stoooooooop-eeee- fried over your no-workee-no-mo dilemma . . . . . . .and have come to a complete stop. This should be close enough to the design concept which is used for that units motor driver circuit. Check the cluster of...
  15. 73's de Edd

    These transistors needed

    The plastic Pn2222 and Pn2907 should work fine in your situation for the 2SD467 and 2SB561 motor drivers . The Pn2222 should also fill for the 2SA945 function. The pin arrangements, side by side , are also the same, but you have to watch their 180 degree positioning .
  16. 73's de Edd

    Switching PSU drops 5v.

    Sir Simon_m74 . . . . . A ceramic bypass or like electrolytic / tantalum problem, wouldn't be "smart" enough to provide that specific time delayed voltage drop. The only chips that I see on the other board that are using the +5VDC supply is the one 555 and (5) AD7111's and multi sets of...
  17. 73's de Edd

    xerox 510dp AC module A1

    Sir copyplan . . . . On that unit, it seems that he replaced the FWB rectifier up near the heat sinks where you made your RED oval and it also looks like a " bodged" quality of workmanship, replacement of another unit on the chassis where he has the 1-2-3-4- markings and the exposed RED BLACK...
  18. 73's de Edd

    Squawk Box

    Sir Kim . . . . . OK . . . . of the transistors that you have given as being used in the "torso" of the unit . . . The 2SA945 is being a common small signal NPN bipolar transistor that is fulfilling more of a small signal handling function, where it can be handling up to 0.25W at up to...
  19. 73's de Edd

    B or not to B

    Sir Lurch180 . . . . . Vel l l l l . . .I am dun bin tellink you vat . . . . It seems like there is the initial device number and as any upgrades are made, they assign A . . . . . B . . . . C suffixes onto the device alfa / number string. Soooooooo I believe, that in your units not so...
  20. 73's de Edd

    xerox 510dp AC module A1

    Sir copyplan . . . . . Your Russkie is not being so good today ? He found that . . . . Bridge Rectifier Single Phase 600V 35A - GBPC3506W Was being bad and had to replace it. Expect associated parts / fuses likely to have been damaged also. Plus heat sink compound is to be used. The printer...
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