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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 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...
  3. tedstruk

    Transistors, Triacs, and Thyristors

    What is the difference between an isolated and a non-isolated triac? [EDIT: irrelevant stuff removed]
  4. 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...
  5. 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...
  6. tedstruk

    Testing a PSU output.

    Is this test performed with all the devices attached, or it it performed on the bench with suitable sources?
  7. 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...
  8. 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...
  9. 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...
  10. tedstruk

    Controversial schematic symbol

    Now here I go again. The capacitor symbol is a widely used and important part of the diagram. It consists of a bar seperate from another bar, and often has (the following is as I learned it DIY study and research); A straight bar, with a curved bar on the opposing side. A barred line on...
  11. tedstruk

    Accesorizing Solar collection

    My solar panel is 50v in full sun. My controller charger is only 40v. I need to accesorize the extra volts with a specialized voltage control, using a sign that says ---!!!! "Teddys Solar Greenhouse" Is it possible to power a lighted sign with raw solar power? or do I need to put a...
  12. tedstruk

    What a battery charger looks like

    This is the component board, un-soldered of course. I always prefit my boards to make sure the components will all place correctly.. I wasn't taught how to properly position my components other than the serial ones are supposed to go one way and the parrallel components are supposed to go the...
  13. tedstruk

    Internet schematic OK

    I wondered if you could look at this and tell me if itsOK or if it would be a failed build?
  14. tedstruk

    Monitor with inttermittent power.

    Repairing a flat screen Monitor motherboard ILPI-027 RevA 2008.09.12 E131175TC-2B 94V-0 0843 with audio I have removed the pucky This monitor worked really well for for 3 years. Then it quit turning on properly. There are three bulging caps 2 of them GK(M) X9M 105 degree C 470uf 25v...
  15. tedstruk

    Card Reader type

    I have contacted Dish network about their old systems and they told me they are garbage, so I have one of their PVR sets and one of their standard ones. I have aquired a digital LNBF for my 10' Cband dish and I want to do some space scanning for other world life forms...( "u" ) So they employed...
  16. tedstruk

    Signal meter salvage NHY6

    I salvaged this old 1-10 signal meter from a satellite system. Is there anything I need to know about it before I begin experimenting with my arduino? Where can I find a datasheet for this?
  17. tedstruk

    Clarification of terms S:N

    I remember reading somewhere that the main point of a circuit is having a good signal to noise ratio. hence S:N So when I am hooking up my guitar pots, I am thinking "too much noise" and trying to clean the fender out of the gibson. Anyway, As I remember the term S:N is counter productive in...
  18. tedstruk

    First alert security camera power source

    I bought a set of 2.4g security cameras for my shop, and they advertised "wireless". They have to be plugged into 100v us for them to work and the wire from the wall wart is a bit shor....t not wireless at all. So I spliced in the amount of wire I needed to reach the plug and the cameras...
  19. tedstruk

    Frequing resonance at audio taper

    I built a 5mhz freq circuit, to install as a tone control in my guitar. I want to know if the 5 mhz isenough to effect the 20-60mhz audio taper or not? How does this work? Does the 5mhz just inc or dec the existing, or is it an add to the top, or drop off the bottom or what? I would think that...
  20. tedstruk

    Value of old tube amps

    Well here I go again. I got a pair of those old consoles and I didn't know what to do with them. So one of them was working fine and the other only a part of it worked. I stripped the bad one down to its guts and repaired a couple of tower speakers that had blown speakers---and I felt like a...
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