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  1. (*steve*)

    1/4 inch mono jack 3 pins

    I shudder when I see someone use the term "jack" because I have to try to read in context whether they mean the plug or the socket. I know "jack" has a specific variable meaning (!) and I prefer not to jack people up by dropping jack into a conversation with some jack-of-all-trades who doesn't...
  2. (*steve*)

    Push button controlled LED decade counter ...

    If I were doing it, I would consider the limit closer to 9V based on an assumption of 2V fwd drop and 7V reverse breakdown. For my own work I don't do it where Vcc > breakdown voltage, but that's very conservative. Sure, the load on the output affects things, but I'd hate to have a design that...
  3. (*steve*)

    Reading 5V on a neutral wire? Hot wire going to ceiling fixture first.

    Voltage on the neutral conductor with respect to earth is typically caused by neutral currents through a non-zero resistance neutral wire. It is perfectly normal. If it is due to this, then you can often draw significant current (depending on the actual load current causing the voltage...
  4. (*steve*)

    1/4 inch mono jack 3 pins

    A mono signal from a microphone may use 3 leads. If the signal is balanced then there are two outputs with opposite phase and a shield. The idea is that him is likely to be a common mode signal with respect to the shield, and that it will be largely rejected by a differential amplifier. In...
  5. (*steve*)

    Woo-Woo MOSFET switch question

    Now you are being offensive. And you don't know the background of people here. Also, magic is performed by either misdirection, sleight of hand, or with hidden information or devices. If you intend to play magic tricks with us here then you're not going to get a lot of useful help but you...
  6. (*steve*)

    Woo-Woo MOSFET switch question

    @Nikša I have reverted your earlier posts. Editing them away like you did is impolite. It means that others can't follow the thread of conversation.
  7. (*steve*)

    How many volts need this lights?

    They look like cold cathode tubes. They take a high voltage to strike, then they operate at a low constant current (5 mA or so?) at a couple of hundred volts. The power supply you have there probably operated from your line voltage, so 110VAC or 220VAC or whatever you have.
  8. (*steve*)

    Phantom powered preamp

    Absolutely bizarre, but both mics work when using a different mixer. (As I found out when doing some initial tests after breadboarding stuff). At the time of initial testing I only had a single XLR cable with me, the one for the mic which requires phantom power. Having equipped myself with...
  9. (*steve*)

    Help identifiying these burnt resistors

    Resistors often shift in value when they get very hot, so a small difference is to be expected. It's also not unusual to have anything to to half an ohm in lead and contact resistance. I would get a couple of 5.6Ω 5W resistors as replacements (as per Harald's suggestion). When you mount them...
  10. (*steve*)

    Help identifiying these burnt resistors

    Are they open circuit? If not, measure their value. It may have shifted a little but it will put you in the ballpark. If they are open, try measuring from one end to a part of the exposed helical resistance track. If you can't funny any of it, carefully scrape off some of the costing near...
  11. (*steve*)

    Yusynth metaliser

    The changed I suggested probably aren't that important. I don't really know why Q3 is biased the way it is, but our of an abundance of caution I'd say keep it as similar as possible. The values I gave would be what I would start with.
  12. (*steve*)

    Yusynth metaliser

    Calculate the voltage on the base of Q3 from resistors R17 and R43. Changing R43 to 100k may be close enough. R21/R22 could be changed to 18k (likewise for all the other similar pairs of resistors). R5 and R6 12k. R18 15k. Is this for a eurorack mod synth module?
  13. (*steve*)

    Phantom powered preamp

    That won't work with phantom power though. The input and output are balanced, power (+ve) is present on the two outputs, with the shield being the negative.
  14. (*steve*)

    PCB mounted transformer How to identify?

    I bet you find the same thing when you measure a capacitor... The diode is connected to a capacitor in the circuit. Show us a photo of the whole board (both sides) and we can try to point you at the most likely things. Have you checked the fuse?
  15. (*steve*)

    regulating power from solar bank

    OK, very useful to know that it is a x-box. The consensus seems to be that you're best off running it from an inverter. However you can get PC power supplies that have a 12V input. These provide the rails you require, and at the sort of currents you require. See here.
  16. (*steve*)

    Security System for a Boat..

    Or a very large dog that you don't feed too often... :-)
  17. (*steve*)

    PCB mounted transformer How to identify?

    The problem is more likely to be with those black cylindrical things (capacitors) or the devices connected to the silver heatsinks (MOSFETs and/or diodes).
  18. (*steve*)

    regulating power from solar bank

    It may use 12V internally, or it may use 12V as a source of multiple lower voltage rails internally. Is it powered by an external power supply, or does it plug directly into the mains? If the former, can you show us details of what is written on the power supply.
  19. (*steve*)

    i have a mag 254 that shots off every 2 hours , i wait for half hour and then i reload and works 2

    What is a mag 254? And so you mean "shuts off"?
  20. (*steve*)

    One battery, four circuits

    Yeah, connecting them in parallel is how you achieve your aims. You probably should have a 15A fuse on each of the separate circuits for the controllers in case one of them shorts out.
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