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  1. tedstruk

    Samsung inverter board LED Fail

    I was given an old 2017 smart fridge that has 3 PCB boards in back. 1. The mains board, 2. The "Inverter Board", and 3. The system board. All the controls on the front panel work, the thermostats appear to be sending signal properly, and all the lights inside the fridge turn on when its plugged...
  2. tedstruk

    New components tests, vs Old components tests

    I have been waiting for thyristors from china for 32 days. They have changed the delivery date 3 times from Dec 7 to Dec 14 to Dec 19... I went to Jameco and ordered some SCRs of the right type that are from the West coast and should be here in a few days... Tuesday or Wednesday anyway. I think...
  3. tedstruk

    MIDI Specifications for AllNotesOff

    All notes off is a general midi command that has 2 states..ON and OFF. It was originally called All off. The first midi machines were hard to keep from overloading, and when they did, they simply stuck the last note.... When On, any stuck midi notes are shut off , when OFF, stick notes can...
  4. tedstruk

    New components tests, vs Old components tests

    https://www.electronics-tutorials.ws/power/triac.html So by the schematics I found here, IF I had to, I could build one using diodes in a similar configuration, so as the diodes were the right avalanche voltage? 'I am considering using the triacs I bought on ebay...which didn't test as...
  5. tedstruk

    what is the different between speaker wire and power wire

    1. if you have a #10 wire running to your speakers they should be permanently mounted, otherwise the the connectors are liable to break when you try to move them becaus the wire is so thick. 2. The manufacturers of solar panels ask that you use wire that is #10 or over #10, and that it be...
  6. tedstruk

    New components tests, vs Old components tests

    I needed a good multi-tester for mass produced products I buy cheap. This one looked alright for the money. https://www.ebay.com/itm/Digital-All-in-1-Component-Tester-Transistor-Diode-Capacitor-Inductor-ESR-Meter/191870868908?hash=item2cac651dac:g:1pAAAOSw8vZXNJCK:rk:22:pf:0 This is the one...
  7. tedstruk

    New components tests, vs Old components tests

    I am boggling again... Assume you have to replace a triac and order a new one. It arrives and you install it. Fine everything works.. but later you test the spare you got, and it tests bad? Well I am thinking, and triac doping is kinda power sensitive.... Would a trlac that has never had...
  8. tedstruk

    What exactly is the difference between these two omron relays?

    Faruksaid- I found so many models of the basic 12V omron relay in arrow that it is making me totally confused. Can someone clarify why omron has different model of the same specification relays? - no, but if you are trying to switch signal, you should be using a thyristor, in a circuit with a...
  9. tedstruk

    Transistors, Triacs, and Thyristors

    found this great write-up on bidirectional thyristors.... If I was not able to get a thyristor(of which I have ordered some from the orient) What kind of diodes and caps could I use in a replacement circuit? er how would I choose the diodes? by volt and Amp and then use a cap of the same Gate...
  10. tedstruk

    Transistors, Triacs, and Thyristors

    https://www.electronics-tutorials.ws/power/triac.html triacs and how they werk... my fancy meter tells me all the thyristors I have purchased are bad... please help.. I have ordered some more. I want them in tact when they arrive.
  11. tedstruk

    Transistors, Triacs, and Thyristors

    What is the difference between an isolated and a non-isolated triac? [EDIT: irrelevant stuff removed]
  12. tedstruk

    How to test a driver board

    My repaired Gulbransen Organs Leslie board, must be tested before it goes back in the machine, after I make my changes to the board, and fix the busted thyristor. The schematic says -- logic board on pin 3 (switched ground) +20v logic board on pin 4 power supply A.C com on pin 8 power supply...
  13. tedstruk

    Transistor Tyristor x-FET

    Or the fence as a replacement for the gate... ahem ...so the generic SC141D I got from the parts house is an NPN transistor of the same number as the thyristor from decades ago...and my chinese meter... says its different from the thyristor I need, so I am kind of worried about using it, in the...
  14. tedstruk

    Heat sink calculation

    Sorry!! made perfect sense to me!!! I got 2 different builds to use as guides in the repair manual. One is a 409347, the other is 870241 BUT... The board I have is a 409046, so I got a Triple threat!!!! The board had SC146M transistors on it. The diagram for the 409347 calls for SC141D's...
  15. tedstruk

    Heat sink calculation

    I have to rework a 409046 leslie control for a gulbransen/CBS organ into a 409347 because of a lack of a 409347, so it will require a resistor, and maybe a jumper or two. The board has SC146M thyristors on it now, and one is blown. The circuit requires SC141D's which I have ordered. It also...
  16. tedstruk

    Testing a PSU output.

    Is this test performed with all the devices attached, or it it performed on the bench with suitable sources?
  17. tedstruk

    Transistor Tyristor x-FET

    I have a question concerning the use of replacement circuit transistors-- I know the Emitter-Base-Collector types I know that G-is gate - S-is ource and D-is drain I should also know that G is gate I think, but what is A and K? Can a GDS of lower voltage rating be used in place of a GAK if you...
  18. tedstruk

    Solid State Musical Organ just hissing....

    The Gulbransen Equinox 2 Model 230 with the top down.. er up in this case. Can't wait to see if I am any good at this stuff! Any help with solid state diagnosis would be of invaluable assistance... how about a title for a good book under $20?
  19. tedstruk

    Solid State Musical Organ just hissing....

    I have ordered a service manual and will continue my testing when it arrives.... I am assuming the button that isn't working is probably the manufacturers..."Time for service" warning device that will work when I get the right procedures in place for it to turn back on. Hence all the time I...
  20. tedstruk

    Solid State Musical Organ just hissing....

    I was wondering about solid state testing equipment, and scoping boards, when they are out of the circuit... Most manufacturerers have equipment specifically designed for that. This is a Gulbransen Equinox 2 musicomputer model 230 that refuses to make any noise other than a hiss that increases...
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