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  1. (*steve*)

    Replace Photoresistor with Solar Cell

    One thing you might want to consider is modulating your laser. This will allow your receiving circuit to be much more sensitive as it will be able to distinguish the laser from other ambient sources.
  2. (*steve*)

    COVID-19

    Thanks for your thoughts @shrtrnd, I am now much better. As bad as it was, I think my wife and I had the flu rather than covid-19. I have recently seen reports that "deaths at home" in the elderly population in New York is almost 10 times the normal value. The reporting I have heard suggests...
  3. (*steve*)

    Help fixing Digital Multimeter Proskit MT1210

    R28 seems to have the same value, measure both of them. The paint chip probably blew off when the resistive trace vaporized under it. There doesn't seem to be much input protection on this multimeter, so the damage may not be limited to the obvious.
  4. (*steve*)

    Help fixing Digital Multimeter Proskit MT1210

    That's actually a horrible solution because the images can disappear rendering threads useless in the future.
  5. (*steve*)

    Help fixing Digital Multimeter Proskit MT1210

    First step is to open it up and check out all the burnt stuff. To upload a large image, use an image compression tool like tinyjpg.com to make it smaller
  6. (*steve*)

    DC Motor Low RPM under load

    I would suspect the contacts on the relay, or maybe a faulty solder joint. Something is reducing the voltage to the motor, and I suspect it's some additional resistance that isn't in circuit when you power the motor directly from a bench supply. You might also check the battery? voltage when...
  7. (*steve*)

    Need help identifying a burned component

    It appears to be some sort of switching regulator of some sort. It may also incorporate the features you list as well. The image you have found appears to be a very similar device. Unfortunately I can't find any source for an ASV7YB.
  8. (*steve*)

    Need help understanding this circuit

    He appears to be using a high impedance piezoelectric transducer, not an 8Ω speaker. Also he doesn't i clearly indicate which way around polarised components go. He has all that extra length of component leads, yet seems to do the dodgy linking of pads together. These "top 'n' electronics...
  9. (*steve*)

    COVID-19

    10 million by the 20th April @bertus?
  10. (*steve*)

    Can someone make one of these

    You would need a lot more information than what's on that video.
  11. (*steve*)

    Circuit with an integrated FLIP FLOP

    Do you know what a flip-flop is?
  12. (*steve*)

    For Sale: Bugtrap Logic Comparator 2000 c and 2074 a

    @windmill fan tells me this has been sold.
  13. (*steve*)

    Circuit with an integrated FLIP FLOP

    Not clearer at all. I understood the original description (did you?) What types of flip-flops are you familiar with?
  14. (*steve*)

    Sciaky model C.R.O.I. what is it?

    That turned out to be the option I took. I replaced the red jack with a red terminal post. It allows the front cover to slip off past it, BUT the hole in the chassis is a little too large, and the terminal post is made of softish plastic. I'll need to either replace it later or add some...
  15. (*steve*)

    Circuit with an integrated FLIP FLOP

    Take a look at the operations of a couple of flip flops and see if you can find a match. Remember that there are quite a few inputs, and A/B could be any two, and the output C could be either of the outputs. If there are more than 2 inputs your going to have to figure out what to do with the...
  16. (*steve*)

    Did you ever have one of those days?

    It's amazing how problems resolve themselves when you're doing what you think you're doing.
  17. (*steve*)

    Did you ever have one of those days?

    Did you ever have one of those days where you grabbed an AD8052 instead of an LMC6482 and wonder why the inputs were behaving really strangely? That wasted about half a day. The circuit in breadboarding uses one of each, and I was using the wrong one all day! Aaaagh!
  18. (*steve*)

    Sciaky model C.R.O.I. what is it?

    I forgot to show you the CRT. And I connected up a signal generator to see how it behaved. First at 300Hz Sine Square Triangle Now 3kHz Sine Square On the fast timebase and the 5V range the 3db points are approximately 100Hz to 1MHz. The 3db points don't seem to change with...
  19. (*steve*)

    Sciaky model C.R.O.I. what is it?

    Well, it looked like there were banana plugs snapped off, but it turns out that insects had made their home in them! Sure looked like metal! It certainly would. I am just catering to all the members here that speak a language that's almost, but not quite, English. Quite a few of the...
  20. (*steve*)

    Sciaky model C.R.O.I. what is it?

    Before: After: They've shrunk!
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