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  1. debe

    Hitachi V-1065A oscilloscope...

    This is a few pictures of the DSO in the above reference. Yes they are cheep & will store data. The data shown is from a USB line as data was sent along it. The picture with the straight line is showing internal noise in the DSO. Ive built 2 of these & find them quite usefull, so long as you are...
  2. debe

    240V ac LED bulb failure

    Ive bought a few of those flood lights. They are great But on removing the back cover to fit a longer cord, I found the Earth wire is just stuck into a blob of Silicone. So you realy need to check on each one to see if the earth wire is actualy connected. When fiting the longer cord I fixed the...
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    240V ac LED bulb failure

    That's exacly what happened to the one I had with the dry joints on the circuit board. It was a $12 bulb but I decided to investigate what happened rather than return it (My curiosity always like to know why something failed)
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    240V ac LED bulb failure

    You got it right 73 s de Edd.
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    240V ac LED bulb failure

    Ive found these cheepies $2 ea more reliable as they are simpler in the electronics department.
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    240V ac LED bulb failure

    This is not about repair as it had to be destroyed to dismantle. The bulb was only about 8mths old when it started flickering then failed. It uses a solidstate chip to regulate current, & there was dry joints on the circuit board like found on SMPS. The circuit board was set securely with a soft...
  7. debe

    Toshiba CRT TV fault... what could the problem be?

    Ive repaired plenty of broken circuit boards on TVs that have been droped. Just clean up tracks & bridge with wire on the tracks. Heres a pic of a broken PCB in a Furuno radar transmit board, works fine now. This unit took a hamering on a small planning hull boat.
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    No AC power from a Powerhouse 500WI inverter generator

    Personaly ive seen more Inverter generators fail than conventional generators. Conventional generators are usualy cheaper to repair.
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    No AC power from a Powerhouse 500WI inverter generator

    This is a typical Inverter module & a typical circuit diagram of these types of generators. The 12V DC as you can see is unreg, but theres a 12V AC winding to feed the Inverters internal electronics (sub coil windings).
  10. debe

    No AC power from a Powerhouse 500WI inverter generator

    The 12V DC output on these types of generator will go to 18v with no load, they are not voltage regulated. I suspect the fault is in the Inverter module & they are unrepairable. Its cheaper to buy a new generator.
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    Toshiba CRT TV fault... what could the problem be?

    Should be easy to remove & re solder, Should be readily available. When you do get to it post a picture of the component side of the board.
  12. debe

    Toshiba CRT TV fault... what could the problem be?

    Un fortunately Ive thrown out most of my CRT TV workshop manuals. But ive found an NEC circuit that shows the capacitor C543, 33uf 250V that will cause the problem you describe
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    Toshiba CRT TV fault... what could the problem be?

    Unless you have experience in seting up Convergence & have access to a Cross Hatch Generator, Don't go there. Its more likely the Video Output stage power supply capacitor. Convergence is unlikely to have altered. Post a clear picture of the component side of the board on the picture tube.
  14. debe

    Toshiba CRT TV fault... what could the problem be?

    Colour bleeding is most likely a small Electrolytic cap on the RGB circuit on the board pluged on to the neck of the tube. The capacitor dryes out & usualy a 250V cap.
  15. debe

    Microwave not powering on???

    If its the HV diode just replace it they are cheep.
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    CDI ignition head scratcher

    Contrary to what the workshop manual says that the module cant be tested. This is how ive set up to test the module & it works. For the Trigger pulse you can us an old reluctor distributor, one in the picture was a Toyota one free at a recycling yard. The other unit I made using parts out of an...
  17. debe

    CDI ignition head scratcher

    Cap value of .22uf is good but don't go over .47uf.
  18. debe

    JEYTECH DSO138 oscilloscope worth getting?

    This is 200Khz in a marine echo sounder, this is about its limit.
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    JEYTECH DSO138 oscilloscope worth getting?

    These were taken from a TV remote control across the IR LED.
  20. debe

    JEYTECH DSO138 oscilloscope worth getting?

    dYes ive built 2 of them & think they are great value. But theres some limitations, theres some noise noticeable on the trace when theres no signal, & its noise in the unit its self. But if you are prepared to make allowances for that then they are fine. What I like is you can freeze frame it...
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