Search results

Search Forums New Posts
  1. N

    A Funny Thing Happened on the way to this circuit

    BTW, did you have one resistor per LED bank, or one shared? As mentioned, one per LED is best.
  2. N

    Project question

    These two appear in the datasheet for the part from WDYJ GM5539. A ready-made module will offer you more options/control. .
  3. N

    Z5500 no sound

    Yes, the output, lower voltage side. Whonoes is suggesting that you test the transformer output without the circuit connected if that can be done. . Take care if you are working on anything live. That high voltage side can be hazardous to your health. Is it is an option, you could consider...
  4. N

    Z5500 no sound

    There appears to be quite a lot online about moding the Z5500. There appears to be a schematic at https://www.head-fi.org/threads/almis-logitech-z-5500-mod-high-end-upgrade-for-the-speaker-system.657715/page-10 Not surprisingly, C27 appears to be a power supply capacitor. WA90 seems to be the...
  5. N

    Actuator control for my nuclear missile complex

    Sort of depends on your technology of choice. As a separate thought, though. More than once, I've seen posted here a solution, and then someone else suggests something even easier. It might be worth waiting to see if this gets any comment, if you are not in a hurry. . Next? Custom electronics is...
  6. N

    Actuator control for my nuclear missile complex

    Is it something like this? Events along the top rows, current state down the left column, state transitions in the table. Just one choice of states. Could also have a representation two interconnected state machines, one for the direction and one simply moving or not. Could also fill in...
  7. N

    Actuator control for my nuclear missile complex

    Stall detection still to be sorted out. WiFi? So are you familiar with state machines?
  8. N

    Actuator control for my nuclear missile complex

    Safety issues noted: So what more is required? Do you have any experience in PLCs? Interesting that you want the one-button control. Some people hate the things wanting in preference dedicated buttons, eg a momentary, open, or close, or stop.
  9. N

    Actuator control for my nuclear missile complex

    Seems with some programmable logic you can do all this. For each, except my understanding of the two above, teh current state determines what happens when you activate the push button. . The main one I didn't understand is the distinction between - Single push and release during movement stops...
  10. N

    How to solve OP-amp capacitor circuit?

    Examine the path that i0 takes. It seems if the source is a unit step times 4.0 then the input becomes 4.0 at t=0; If, as you say the two opamp inputs are equal then you can work out the current through the 20K resistor. If the opamp is perfect, infinite input impedance, then you can calculate...
  11. N

    Transistors

    table including other parameters.
  12. N

    Transistors

    Data sheets. A bit easier for similar transistors as they tend to be on the same sheet. Your question BC547, can I use a BC548? Depends on what's important. Let's look at the differences. The table shows that the only differences are the maximum voltages. We can see that the BC547 has higher...
  13. N

    Why is this Happening to Me?

    Great to hear. The second part, anyway. Example circuits are always good. Whether they are great and you learn from them, or whether they are terrible and you learn from working out why, you learn from them. Keep at it.
  14. N

    Led bar graph

    Bar or dot format: Check out the "mode" pin. 50 LEDS all on will draw a little current.
  15. N

    60 GHz rf meters

    If it is from 5G then it's at safe levels. It's in the design of the standards. :) Measuring field strengths is not as simple as some imagine. Multiple path makes it complicated. It won't stay the same over time or space. With a wavelength in the order of 5 mm and a reflecting environment...
  16. N

    60 GHz rf meters

    Cheap? Measure? What do you want to measure? How accurately? . We have a fieldfox. To get to 60GHz a downconverter was recommended. Comparatively cost effective solution. Relatively to buying 60GHz gear. :). Then there's an antenna. . Keystone instruments also have USB, thermocouple-based power...
  17. N

    Electronics Moron Needs Help

    Gearbox? . Never tried to "dim" a Dremel. Will the load be constant?
  18. N

    Why won't field-oriented controlled PMSM motor spin in Simulink?

    I don't have simscape electrical, so can't try it. Nor have I doe anything much with rotating machinery, so unfamiliar with your blocks. I think I get the Clarke and Park stuff from the descriptions on Mathworks Sorry not familiar with/don't know what PWMTest does. I see a speed error. What's...
  19. N

    Transistor Identification help requested

    One way I did that quickly is to put them on the screen, small-ish, and use snipping tool or similar to cut them off the screen. Instant downsize and with resolution that you can see is ok.
  20. N

    Relays

    Does the actuator specify a current? Does the 12v 4 channel relay specify a maximum current?
Top