Search results

Search Forums New Posts
  1. (*steve*)

    Identify smd capacitor

    Perhaps you should get a real charger and throw away this fake one.
  2. (*steve*)

    Pure Capacitor Circuit Help

    Possibly it is a limitation of the software something along the lines of what you suggest.
  3. (*steve*)

    Tibhar robo pro master PCB problem

    That's an indication it got pretty warm. Perhaps it's due to the fault, perhaps it's just that someone was being a little optimistic about the current carrying capability of the connector. Resoldering the pin would have been my first move too. Does anything else get hot? Does the 5V rail...
  4. (*steve*)

    Identify smd capacitor

    "Augest". I guess Apple can't spell. Or maybe there's another reason. 1N914 and 1N4148 are functional equivalent. What are the numbers on the resistors?
  5. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    See post 75
  6. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Yes, but in this case you need to consider both the input resistor and the base/emitter resistor in series. (And then both of them (one for each transistor) in parallel). What current are you assuming?
  7. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    You can use ohms law if you want to, but you can often consider the current through the transistor to be zero (I think they specify a maximum value of some small fraction of a milliamp, but I can't remember it off the top of my head)
  8. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Can you see a path to any rail?
  9. (*steve*)

    Power Supply for Car Radio

    At very low volume levels that power supply might work, but you'd want to be VERY careful not to overload it.
  10. (*steve*)

    Zener diodes not working

    What voltage are you seeing? Less than a volt or the 16 to 18 volts? Are you measuring across the zener? Or across the zener and the resistor? Or something else?
  11. (*steve*)

    Questions resect plastic of electronics

    Dunno, and no.
  12. (*steve*)

    Light therapy device

    The bean angle is typically the 3db point of intensity. Without knowing the distribution of power with angle, you can't do any sort of precise conversion.
  13. (*steve*)

    DS1338 and DS323x Realtime Clock modules compatible?

    There's various Maxim application notes which compare these chips. One important factor is that the 1338 is a low power design, while the 3232, with it's TCXO is high power (to run the heater). The pinouts are probably totally different, but I'm sure you don't mean compatible in that sense...
  14. (*steve*)

    DS1338 and DS323x Realtime Clock modules compatible?

    What do the datasheets say?
  15. (*steve*)

    Li Ion batt. pack

    Between the batteries, probably
  16. (*steve*)

    Making a Wireless Security Camera

    It's hard to tell. There's barely any information there.
  17. (*steve*)

    Light therapy device

    mW/sr is yet another measure of intensity. Whilst it will be higher for a more powerful device, it will also be higher for a device with a more focused beam. Google for "mW/sr" :). Here's one link http://www.jensign.com/LEDIntensity/
  18. (*steve*)

    Frame Detector Functional Specifications

    How much of this have you already figured out and what but are you stuck on?
  19. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Yep. It will overestimate the current a bit, but that's fine.
  20. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Yeah, sorry, you're right. I misremembered it. Now you have that, assume the entire load is the resistor between the input terminals and bases (assume Vbe is 0V). What current will flow?
Top