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  1. (*steve*)

    Multimeter giving bad voltage readings

    @seanspotatobusiness, I'd make sure it has nice new batteries in it. @shrtrnd, Standards lab? Cool. You should tell us more about it.
  2. (*steve*)

    Need to know pin out (input output voltage ) of an old UPS Transformer

    Well... Use a multimeter to determine which belong to the same windings. There are multiple possibilities. Then take the pair of wires with the highest resistance between them and apply 12VAC to them (that's 12, not 120, 240, etc!!!). Once you have that connected, measure the voltages on the...
  3. (*steve*)

    Playing with valves

    Making the actual sockets from charred wood is probably not the wisest move. However I have very low voltages in mind. I can always make them out of acrylic or even make them removable so they just hold the pin sockets in alignment while they are soldered if I want to use higher voltages.
  4. (*steve*)

    Playing with valves

    Does it count that I "hand cut and chiseled" the program used to create the cutting outlines for a laser cutter? The boxes are made from a rare and valuable timber called MDF :-)
  5. (*steve*)

    N Channel JFET Testing in ESR Tester

    Yeah, I cheated a bit. There's no direct road route. it's only 3450km as the crow flies. It's not quite the two most distant points in the country, but it's pretty close!
  6. (*steve*)

    A Welcome to EP For AudioGuru

    I'm not a person who likes distortion. Unfortunately there are a large number of musicians who like "tube sound". My understanding is that running the valve at significantly lower than its rated power will yield longer tube life. This is largely an experiment for me, however the muso's seem...
  7. (*steve*)

    N Channel JFET Testing in ESR Tester

    It really depends on how good the tester is. maybe the "two diodes" have low tra When I'm closer to home. I'm over 5000km (that's 2 states) away by road at the moment. Hard to get to the shed at the moment :-)
  8. (*steve*)

    BJT AMPLIFIER

    What's the problem?
  9. (*steve*)

    Cfl lamp from 3.7volts project.

    I had just assumed it was a working project. There was no mention of problems in the initial post.
  10. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi vbolt. Just to let you know. We're not part of the dark net. But welcome to Electronics Point.
  11. (*steve*)

    A Welcome to EP For AudioGuru

    Hey @Audioguru, I'm in the process of designing a hybrid valve preamp using a small directly heated Soviet tube (1j24b). The intent is that it will be battery powered and built as a kit. I'm using a DSA to evaluate early prototypes for frequency response, gain, and distortion using a swept...
  12. (*steve*)

    Does anyone know the name of this connector

    is it just a 5 pin DIN connector?
  13. (*steve*)

    Signal flow fundamentals

    To understand this, you need to understand how a simple class A common emitter amplifier stage works. You need to understand what the relationship between the emitter and collector load do to the stage gain and their impact on the dc operating point. From this you can understand what a low AC...
  14. (*steve*)

    Li-ion battery management chip

    Could those digits on the chip be CD4011BM?
  15. (*steve*)

    12v 3amp battery charger lead acid

    I prefer some form of current limited voltage source. Sure, an incandescent bulb is a great current limiter, but without some form of voltage limit, it is very easy to overcharge lead acid batteries. For flooded cells this can actually be useful, but not for gel cells.
  16. (*steve*)

    Need an expert to identify this part

    Googling suggests they are hard to find. However the NT811S seems to have been used in some TVs. Maybe someone with TV repair experience can suggest a replacement.
  17. (*steve*)

    Signal flow fundamentals

    NO! Current does NOT take the path of least resistance. It current flows in multiple paths in values inversely proportional to the resistance. This is like side streets vs. highways. Not everyone takes the highway (path of least resistance). A small number of people take the side street...
  18. (*steve*)

    RT8059 step-down DC/DC converter - can't get it to be stable, annyone with experience?

    Having looked at the datasheet and your construction, it is pretty clear you didn't comply with the section of the datasheet about layout. On the other hand, the voltage divider may simply require the values to be halved. it looks like you've set the output voltage to 3.6V. that will require...
  19. (*steve*)

    RT8059 step-down DC/DC converter - can't get it to be stable, annyone with experience?

    My first guess is that R1 and R2 are waaaaay too high in value. Start by reducing them by a factor of 100, and if problems persist, by another factor of 10. Also, please post images directly here. On a phone, pastebin is a pain and it's just lucky that your image was simple enough that I...
  20. (*steve*)

    Trying to make a transistor cancel another transistor

    Yes, if we had a good idea of what the OP was trying to achieve we could be much more helpful. Something like: "I have 2 LEDs. I want one on and the other off. When I close a switch I want the one that was off to go on, and the one that was on to go off. When I open the switch I want them...
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