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  1. (*steve*)

    Restoring a Regal Do-Wa-Diddy by fOXX

    This is an example of one of your statements that would get your post deleted as "rubbish" in any thread other than your own. Of course this isn't typical.
  2. (*steve*)

    Axial power inductors x2 needed

    I'm not sure I understand. Did you replace the inductors (which measure as a dead short) with a dead short, and the device started working again? If so, it sounds like there was a bad solder joint or some other connection rather than a problem with this inductors.
  3. (*steve*)

    Low Voltage Cut Off For Grid Charger

    OK. So all you want is to stop the discharge at 130V? Here is a simple circuit, but it does have some issues I will need to resolve Before I could suggest a MOSFET and determine the need for a heatsink, I need to know the cold resistance of your lamps. Please measure the resistance across...
  4. (*steve*)

    Low Voltage Cut Off For Grid Charger

    Not sure about these nickel-metal-hydrate cells. Are you sure they're not nickel metal hydride (NiMH)? Is this a Prius?
  5. (*steve*)

    Capacitor Protection Boards- How do they work?

    NOTE: R2 is 180k, NOT 100k as shown below. The first thing to do is to replace the drawings of the components with their schematic symbols, ensuring you connect the wires to the right places: Note that in drawing this, I made the assumption that the connection between U1 and Q1 is...
  6. (*steve*)

    How can I use a sensor output (0-5VDC) to actuate power disconnecting to another device?

    120A? Really? Is the load purely resistive? And about those voltage levels. What do you want to happen when the voltage is very near a limit, so what happens when the voltage is randomly varying between 1.999 and 2.001 volts?
  7. (*steve*)

    How to limit solar current input for testing

    http://www.electroniq.net/power-supply/battery-chargers/12v-battery-charger-electronic-project-using-lm317.html
  8. (*steve*)

    How to limit solar current input for testing

    See post #7
  9. (*steve*)

    Capacitor Protection Boards- How do they work?

    That tells me that Q1's emitter is connected to +ve. Show me the circuit diagram you've managed to draw. I'll check it for you.
  10. (*steve*)

    Can i upgrade my UPS by replacing 4.5Ah battery with 200Ah battery?

    Maybe, but one problem lies with my point (3) above. The other lies with the design of either or both chargers. Will they work in parallel? (I simply don't know) That should work. But it would be a PITA. The unit is designed to operate with the internal batter and the box closed. How do...
  11. (*steve*)

    Using 2x30A breakers on AC main (neutral and hot), will they trip at 30A or 60A?

    Let's assume they are two different, independent breakers. Let's also assume that the same current flows in the active and the neutral conductor (a short cut for saying that there are no earth currents, or other power sources that screw with the balance of currents in the 2 conductors) For a...
  12. (*steve*)

    Another one Tek 2235 power supply problem

    First, find yourself a service manual for the scope. Second, look up the diodes and get their Tek part number. Third, google "Tek cross-reference list" and search for that part number.
  13. (*steve*)

    Can i upgrade my UPS by replacing 4.5Ah battery with 200Ah battery?

    Yes and no... Firstly, it's likely that the bigger 12V battery will have sufficient voltage and current capability (pretty much by definition). So what could go wrong? The inverter may be specified for intermittent use, operating it for long periods could lead to premature failure. The...
  14. (*steve*)

    Restoring a FOXX FUZZ-WAH

    You've probably noticed that nobody is replying to you. I find your questions to be far too hard to understand, and I perceive your understanding to be poor. Added to that, you seem to move from one problem to another without waiting to solve the first. From my perspective, I feel I would...
  15. (*steve*)

    Component ID

    That's with respect to the base. You need to measure the voltage on the base, or the voltage between the base and emitter.
  16. (*steve*)

    List of materials and tools for creating a BIOS chip reader / board with USB and DVI outputs?

    It is no more a catch 22 situation than having a car which can drive you to place AND have windows so you can see where you're going. The programmers have a USB port because PC's these days don't have serial ports, and because (in many cases) I removed the need for a power cable. London to a...
  17. (*steve*)

    ID glass cartridge fuses ???

    You might expect to see something like 250V 5AT For a regular 5 amp slow blow (T) fuse, or 125V 630mAFF For a very fast blow (FF) 630mA fuse.
  18. (*steve*)

    Memory investigation on an HP35665A and bad desoldering

    Woo hoo!
  19. (*steve*)

    Memory investigation on an HP35665A and bad desoldering

    Well it's been a while... I was building a memory board but there's less space than I realised. So I bought the required chips to upgrade the board and populated it. After fixing my poor desoldering again, it works but it doesn't see all the memory. I'm hoping it's a jumpering issue.
  20. (*steve*)

    How to limit solar current input for testing

    Well, firstly you need a higher voltage as @Audioguru suggests. Then you need a current limited voltage source. If you can find a similar high voltage buck switch mode regulator with an output of maybe 20V, you can use that to drive an LM317 set up as a current limited voltage source. Set up...
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