Search results

Search Forums New Posts
  1. 73's de Edd

    MFOS VCO fault

    Sir darren adcock . . . . . Looking at all of the outflowing power points that could load down either the +-12VDC supplies, looks like one needs to check the C7 and C10 filter caps that are directly across them as the power enters. VERY probable as being O.K. wih no problems with them. Then...
  2. 73's de Edd

    RF transmitter circuit

    SIR freakinshoe69 . . . . . Could we suggest . . . for utter simplicity . . . . . none other than a a baby monitor transmitter . . . . . . .acual DC supply power is usually 9VDC. Availability . . . as used item . . from . . . Yard sales . . . . Garage sales . . . . Flea markets . . ...
  3. 73's de Edd

    Tecsun PL-600 TA2057 AM FM Receiver Chip Circuitry Question

    SIR radiotek . . . . . Can you give me access to the whole schematic or model # and brand. Initially and as a preliminary thought, I am certainly seeing that external slave circuitry as being related to being used to switch in the beat oscillator . . . with it using a transistor and a 458 khz...
  4. 73's de Edd

    I have a manual battery charger quit working

    Sir DADR . . . Were you able to get another SET of mini hockey puck diodes . . . as it would be MOST desirable to change as a set of identical dodes. The thermal unit protects from gradual temperature rise of the transformer up to that 115 degree threshold. The square chemical unit protects...
  5. 73's de Edd

    Need help with a component.

    Sir jyrx . . . . . Q211 . . . .I would more likely suspect its code to be a 1R https://www.sos.sk/pdf/SMD_Catalog.pdf How does its junctions test in diode test mode ? Also do you find that same part number used elsewhere on the board, so that you can compare junction readings, unless that...
  6. 73's de Edd

    What is this device inside our well pump controller box?

    Sir kingmoa . . . . . Looking at the units 220V contact pairs on both of those units . . . they both look pretty good. You just need to check and see if 120 VAC AC activation voltage for the coils is getting thru to the RED circled contacts on each unit. The contactors/ relay coil is a 9998...
  7. 73's de Edd

    Faulty 9VDC Power Supplies

    Sir partyanimallighting PRELIMINARY . . . . IF you have the physical mounting room, the use of double or triple electrolytics to accomplish your summed capacitance, can APPRECIABLY increase the long time life and reliability of a rectified secondary windings supply filtering. In this manner...
  8. 73's de Edd

    Magnavox mdr557h/f7 dvr

    Sir ennisdavis . . . . . To confirm that you are using the proper time lag fuse replacememnt . . . . to further save any more power components from getting crowbarred. Locate a desk, torchiere or drop light that accomodates conventional screw in based incandescent bulbs. Place a 60 or 100...
  9. 73's de Edd

    Help stereo Light indicator problem on a 1976 technic SA - 5360 stereo receiver:

    Sir J0shua . . . . . Firstly . . . check the units MODE pushbutton on the front panel . . . to see if it is in its STEREO position . . .if it is in MONO it will be grounding out the DC signal that activates the FM STEREO lamp indicator. If that is the case . . . . then it would absolutely...
  10. 73's de Edd

    Help with HD PCB part

    Sir Magister73 . . . . . Looking at all of the other parts . . . . this parts second lines info seems to be related to a parts date code of manufacture . . like circa 2006-7 ? Reference : http://www.s-manuals.com/pdf/datasheet/1/s/1smaxxat3g_on.pdf Look at page 3 . . . . . line 1...
  11. 73's de Edd

    Flashgun no longer triggers flash

    SIr Sony guy . . . . . Here is a basic reference schematic that I have sectionalized and marked up its relevant sections. I didn't catch this post until just now. Looks like you now have yourself a dedicated cap tester also. From the snippets of info that you gave, it was then possible to make...
  12. 73's de Edd

    Dynamo Air Hockey Table Need help with main board

    Sir roastedrick . . . . . Do your internals anyway resemble pages Pages 24-25-26 ? REFERENCING: http://www.valley-dynamoparts.com/docs/2016HockeyManual.pdf
  13. 73's de Edd

    Thermometer Circuit

    Go for it . . . . . https://www.google.co.in/search?tbm=isch&slpassthru=1&q=Temperature%20High%20And%20Low%20%20Comparator%20Window
  14. 73's de Edd

    Name of this electronic component?

    Two pushbuttons on top to "thumb" and then . . . THE . . . . damaged bottom unit was for finger control and being spring loaded . . . .looks like only two pressure wiper discs are still visible and intact . . .possibly a pot(s) being the mising 3 terminal part. Have any friends that have a...
  15. 73's de Edd

    Name of this electronic component?

    is this your units control ? http://cdn.shopify.com/s/files/1/0150/5168/products/remote_in_hand_9a1b790b-755b-4467-aa51-e5d646c595a1_grande.jpg?v=1398551984
  16. 73's de Edd

    Identifying equivalent for surface mount diode from photo

    The rest of the applicable circuit design of the board is not shown and can not be seen . . .BUT . . . .ES1G's are Faaaaaaaaaaaaaaast 25 ns switchers. https://www.diodes.com/assets/Datasheets/ds14001.pdf
  17. 73's de Edd

    Finishing touches on motion alarm

    Was the voltage rating on the coil of the relay such that you had to include a voltage dropping resistor in series, if so ,you might need to filter the reduced DC supply at the relay coil end with an electrolytic capacitor after that voltage dropping resistor. Also a short leaded .1 ufd cap...
  18. 73's de Edd

    Identifying Old Components Help

    Looks like thingy dingy 2 might hold the greatest hope for its component stripping for anyone that is still using discrete components. With that DC DC converter label looking as if it might have fed many meals to a silverfish insect. The 3 others might only interest an RF experimenter or a...
  19. 73's de Edd

    Casio WK-3000 no power on adapter but power on batteries

    Sir jimkarl . . . . . That is exactly what the schematic is showing . . . central pin is NEGATIVE. . . . . OR . . . . if the 2 conductor wiring used between the wall wart and it's end conductor plug is not being all hidden within a round cabling. And happens to be utilizing a visible pair...
  20. 73's de Edd

    Casio WK-3000 no power on adapter but power on batteries

    Sir Jimkarl . . . . . IF the WK-3700 is schematically being the same as the WK-3000 here is a simplified and dedicated schematic, that is showing solely your power flow in both battery and external power connections. In order not to have to use an internal / external power changeover switch...
Top