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  1. 73's de Edd

    Wearable bus card

    You are showing us a “Smart” card with its contact driven interfacing. The one you describe is using wireless RFID interfacing. Apparently that company is in progressive transition / replacement mode between the two types. Should your intentions be “most honourable” and “all above board”...
  2. 73's de Edd

    1977 Realistic STA-90

    Sir . Lucas . . . . . There is one problem I see, that I don't think that you have a rats ass chance in Hades without . . this info being placed just below. I also have all info on the unit. HOWTODOITTOITBEFOREITDOESITTOYOU . . . . . . . 73's de Edd .
  3. 73's de Edd

    Outlet caused HOT IPAD/TV has lines on screen

    Those erose patterns look like inflicted PHYSICAL damage to me. An electrical problem or panel driver problem would take out info a line or combo of lines. Confucius say . . . . . . all the electricians at Con Ed couldn't bring those lines back . . . . . . side comment . . . Humpty Dumpty...
  4. 73's de Edd

    Sometimes a monster

    We KNOWS . . . you is a monster . . . board certifiable . . .LOL. BTW can i have a close up of those " 1 Dollah" Chinee needle nose pliers and cutters that have a green pencil crossing over them, I really can't tell if that is the mini linemans pliers or the needlenose versions . . .or...
  5. 73's de Edd

    What is this component ? please help me

    That looks like a Korean knock off of a 5D diode which I would be replacing wih a 1N4007 . Confirm if that casing diameter is being in the order of 3.1750 mm, since I can only comparison reference to its leads. Also take DVM and use its diode function test to confirm its not shorted and that its...
  6. 73's de Edd

    Monitor

    I'll buy 3 of the joints conditions, BUT with this being a single sided board and with that cluster of three connections, being on "DEAD" pads that have no involved other connections actually being made into them. HOWEVER the right bottom connector of the three IS BEING involved, along with its...
  7. 73's de Edd

    (Russian) 1978 Radio's audio signal path from cassette deck

    Sir Richard9025 . . . . . Only the most relevant schematic sections were carried forth on this markup. With you having such good performance on the radio sections, the BLUE section will be fine. In the WHITE areas of the tape funcrion, the ttape signal audio flow is from far right, to the...
  8. 73's de Edd

    Help identifying IC

    Mme AmandaM . . . . . It was in the book . . . . Here you go . . . . you buy for me . . . it only cost 56 Amellican Pennies . . . or .50 Euros http://www.mouser.com/ProductDetail/STMicroelectronics/MC34063ACD-TR/?qs=sGAEpiMZZMtitjHzVIkrqQuPTN1dYok/SlVsfDoCO74= In looking at the fuller pic...
  9. 73's de Edd

    Resistor Pick Question

    We l l l l l l . . . . in still not having had a comeback from THE post initiator . I will just say that I would take the now assumed to be 679,700 ohm 1 % ree-sistor and tie a 300 ohm in series and go fer it. Then, seeing how close I would come to that all magical 680K final result. In...
  10. 73's de Edd

    Monitor

    See if you find some some floating solder connections to the HOZ output tranistor. Pass a photo of that area if possible, also including the driver transformer and its transistor that feeds the HOT along with their part numbers. 73's de Edd
  11. 73's de Edd

    Transformer output puzzle for tube pre-amp project

    Sir Electro-Cat . . . . . Hej! “ Don’t wurry ‘bout it “ . . . . . . . you'll be fine ! . . . . .just as it is "Reading" the PC boards . . . . As you can see, the lower voltage one of the two transformers is having its AC converted to DC and regulated and filtered to present PURE DC...
  12. 73's de Edd

    Resistor Pick Question

    ? ? ? 1) 679,70 ohm 1% tolerance 2) 679,93 ohm 25% tolerance. What are you even doing with ~680 ohm resistors, when you are wanting to hit the closest to 680K.
  13. 73's de Edd

    Help identifying IC

    Mme AmandaM . . . . . You didn’t give a whole lot of extra circuit board adjunct components views but the foreground suggests of a required inductor’s edge barely showing . Pins 1 and 2 are the prominent power handling connections to an internal power transistor. Pin 4 looks of being connected...
  14. 73's de Edd

    Digital Piano Low Volume

    Sir zifey . . . . . Your problem will very likely be the potted POWER Audo Amplifier Module that I have marked up in the top right of the schematic with points of initial interest in [YELLOW]. Get that 250 board acessible for AC metering and initially put a continuous tone / note thru the unit...
  15. 73's de Edd

    Dynamo Motor Sparks Inside

    Sir noob . . . . . Just observations . . .but that blender motor should come up faaaaaaar-faaaaaaar-faaaaaar ( times 10x ) short of the needs of a tablesaw. I started with a 1/3 horsepower 1750 rpm unit on my 8 inch table saw in 1956 and finally updated to a 3/4 horsepower one in 2000 with...
  16. 73's de Edd

    Reverse Polarity Protection (some questions)

    You don't REALLY gots it . . . . IF you put the diode, as per your . . . Schematic 2 . . . where it is on the circuitry PAST the switch. On switch turn on, its contacts can spot weld together. 73's de Edd.
  17. 73's de Edd

    2.4V Ni-Cd Charger

    Sir abuhafs . . . . . Let’s find out . . . for your particular situation. With a 3.5VDC and 1 Amp capacity, that wall wart should not sag and pull down at the much lower current pull that we are wanting. I thought that I had included my marking up of your schema in the earlier posting . ...
  18. 73's de Edd

    Reverse Polarity Protection (some questions)

    My favorite is still the diode PAST the fuse, with no voltage drop of a series diode if any real curent passage is involved. https://s24.postimg.org/lkt17dasl/Diode_Reversed_Polarity_Protection.png 73's de Edd
  19. 73's de Edd

    Geiger pulse detection circuit

    Sir sebswed . . . . . If after engaging the detectors power supply, you find the minute fast duration pulses of natural environmental weak radiation triggerings . . .consider. The fact is, that you could "tailor" the gain characteristics of the initial use of that darlington pair, should you...
  20. 73's de Edd

    Oscilloscope used as a component tester

    Sir Gillie . . . . . It would just effect the overall display size . . . . and with that low impedance of testing involved, any loading effect would not be a consequence. I would be using a 1X. " OCTOPUS " . . . . . . Semiconductor Tester Waveforms 73's de Edd
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