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  1. kellys_eye

    Paralleling microSD cards

    Couple of nice and clear pdf's there bertus - thanks for taking the time to post the links. But if anyone has done this and can report on their results I'd be interested to hear how they got on.
  2. kellys_eye

    Can I fix this old Pioneer SR303 Reverb myself?

    Check D13. If that checks out ok then snip the wire link (second left of C36) and see if TP4 voltage rises. Note - above TP4 is C37. To the left is C36 followed by two wire links. Snip the second link. This is the (dodgy) 15V supply to the rest of the device and if there is a fault 'further...
  3. kellys_eye

    Paralleling microSD cards

    Has anyone ever parallel-connected multiple micro-SD cards? If so, what technique/results did you get? Can you parallel the data lines and switch the power lines 'as required' or do the data lines need isolating bi-directional buffers?
  4. kellys_eye

    Can I fix this old Pioneer SR303 Reverb myself?

    TP4 and TP5 should read approx +/-15V (with respect to ground) - since they show 0V (as good as) the first suspect would be R1 (open circuit) however this itself would only 'blow' if there was a fault further into the circuit. Are you sure you're reading DC voltages at the TPs' and not left the...
  5. kellys_eye

    i have problem in my electric pressure cooker it just trip whin make on

    Damaged heating element. Change the element or buy a new cooker.
  6. kellys_eye

    How difficult to have a microphone made

    Not really. Amplifying the mic means amplifying the extraneous noise(s) that you DON'T want, too. This is why microphones are used close to the speaking person. Try using the headphone/mic lead that most phones are supplied with - give the mic to the other party and hold the phone yourself.
  7. kellys_eye

    Can't find the transformer I need so need to build my own

    You first. You have yet to put a practical application forward and ignore advice already given on designing transformers and/or using commercially available items never mind the actual reason you seem to want to keep pushing the 'solution'. 1. You don't need to charge the batteries at 1C to...
  8. kellys_eye

    Can't find the transformer I need so need to build my own

    Waste of money. It's AC output, not the DC you require.
  9. kellys_eye

    Didn't make a note of single subject in engineering, graduating soon what to do?

    If you UNDERSTOOD what you were taught you should be able to replicate the notes from your understanding of the subject(s). I think, however, that I know the real answer to that........
  10. kellys_eye

    Can't find the transformer I need so need to build my own

    If the cell discharge rate meets with the specifications then by default they MUST be charging to their full stated value. You do not need to charge them at 1C to prove that. Charge them at a rate you are capable of achieving - or plan to use during NORMAL operation. As long as they deliver...
  11. kellys_eye

    Bench power supply upgrade

    Heatsink - does it even require an insulating pad? Not all devices do (some with isolated bodies, some where the heatsink itself is 'live' but isolated from the rest of the equipment). Either way, if insulation is required it should ideally be a new washer ('dry' if it's a silicon pad, compound...
  12. kellys_eye

    Technics SA-290 receiver problem

    Yup, sounds very much like a capacitor issue - typically in the power supply section(s) and the PSU specific to the display (probably a 5V source?). As Martaine says though, after such a period of time (and if the equipment is worth preserving), replacing ALL the electrolytic capacitors is...
  13. kellys_eye

    LENZE E82EV453_4B201

    Any competent electronics repair place would at least be able to give an estimate. If you want specifics then Google will provide the details.
  14. kellys_eye

    Can't find the transformer I need so need to build my own

    Iron filled epoxy core WILL NOT WORK with standard AC mains frequencies. You are creating (effectively) a 'dust iron' core which will only work at higher frequencies. If you want a core for domestic AC frequencies you either need laminations (E/I, C/T etc) of a single 'strip' would into a...
  15. kellys_eye

    Can't find the transformer I need so need to build my own

    Figure on fire and smoke! AC mains transformers require laminated cores to operate at 50/60Hz. Ferrite cores are made to operate in the 10's of kHz region (and more). Any transformer you obtain/make/use will only get you in the BALLPARK for the volts/current you need. You really do need to...
  16. kellys_eye

    Power switch Identification

    3/8" is 10mm (actually 9.5mm but 10mm is the usual go-to dimension used) - have you searched using that as a parameter?
  17. kellys_eye

    convert 110v dc to 110v Ac

    Your pump looks to be around 70-100W which is 'insignificant' in terms of power consumption related to a propane/gasoline generator. I have a couple of 750W inverter-generators (gasoline) that consume under 1 litre per hour at low load (<500W) so a gallon (tank full) will run it for 5+ hours...
  18. kellys_eye

    Infrared Portable Furnace Clinic CS-7SA R40A 8131

    Not a thermostat (as such) but a thermal switch - G00gle returns many suppliers for that exact part number so it should be readily available. The code embossed on it will show the switching temperature - I'm guessing yours is 131degC. These are normally fitted as safety cut-outs...
  19. kellys_eye

    Grounding question in regards to battery powered inverters.

    Looks pretty clean to me - as for 'wandering' can you measure this? There is always a response time to changes in load so perhaps it's in the ballpark according to spec? Do you have the capability to test for transient response and/or comparing the output volts to spec according to load...
  20. kellys_eye

    Can't find the transformer I need so need to build my own

    Your maths is probably ok - you might be mistaking the wind power for the actual available power though. For the VAWT with 1.223kW available WIND POWER the actual output (electrical) is 0.349kW so at 48V is 7.27amps (maximum 4.9kW or 100A). You forgot to factor the efficiency in (or, rather...
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