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  1. (*steve*)

    Beginner question : 555 timer pin 4

    That is pretty much what I was going to suggest. Well done :-)
  2. (*steve*)

    New components tests, vs Old components tests

    As we suspected. You should not be surprised that this can't test many SCRs
  3. (*steve*)

    Simple multitester

    I would recommend you read this thread. It is clear that even the briefest breakdown of the EB junction, at even the lowest current causes damage to the junction. Whilst this may not cause failure, if a tester causes any damage, that's not a good thing. Operated from 3V it would be much...
  4. (*steve*)

    Simple multitester

    The device is not running continuously, so the cumulative damage will probably be occurring slowly enough that the device will have a relatively long life. However, I question it's use for testing base-emitter junctions of transistors. The fact that it's slowly killing itself is less if a...
  5. (*steve*)

    New components tests, vs Old components tests

    "Standard" and "internet" used in the same sentence -- ROTFLASTC! Yes, where they are able to test SCRs and TRIACs, they are frequently only able to maintain a current too low to hold device on. Since @tedstruk has refused to answer all questions about how he tests the devices, we can't really...
  6. (*steve*)

    Beginner question : 555 timer pin 4

    You are right, and it is operating correctly. However, you also have your logic reversed, so the correct operation is not what you require :-( The output will be low if either comparator is pulled low. So for it to go high, BOTH thermistors have to register "hot". This is called inverted...
  7. (*steve*)

    Sending MIDI signals via PIC's Usart module [SOLVED]

    I hope you're well on your way to having this sorted out :-)
  8. (*steve*)

    Sending MIDI signals via PIC's Usart module [SOLVED]

    32 us for a bit is exactly what you should expect for 31250 baud. 120us (0.12ms) is almost exactly 4 times longer. Does it work with the crystal instead of the internal oscillator?
  9. (*steve*)

    Softeen 500W Led Fog Machine with Lights, circuit board has melted and I need help identifying it

    If you can answer the questions you've been asked then you may be well on the way to finding a decent substitute.
  10. (*steve*)

    Sansui 5000a Won’t Power On

    It definitely sounds like a switch related issue. I would confirm by checking the switched outlet, but I suspect it may be beneficial to spray the switch with some contact cleaner. Hopefully there are some openings in the switch that you can spray into. I think the problem is probably more on...
  11. (*steve*)

    Modifying a battery powered light to hardwired.

    It is also quite possible that your switched power supply, even on 6V may still more than 6V. If I were you, if check it. Rather than soldering the wires to the battery terminals, I would make some fake batteries. I have used a piece of dowel with screws in the ends. The fake batteries can...
  12. (*steve*)

    photo identification

    I was going to say that it's what is asked for to prove your age. But I won't say that. If your image is coming straight from a camera or your phone then it may be too large. Using a photo editing program to scale it so it is a lot smaller (640x480 is often sufficient resolution) may solve...
  13. (*steve*)

    Measuring DC amps with a digital multimeter

    There are a couple of possible reasons. The first is that you are reading or operating the meter incorrectly .Let's assume that's not the case. However I have been trapped by this in the past where the probes were plugged into the incorrect sockets for the range I selected. Confusingly, one of...
  14. (*steve*)

    Theory/reality mismatch in a transistor circuit

    I suggested you try powering it from a clean DC source, but you refused
  15. (*steve*)

    Sending MIDI signals via PIC's Usart module [SOLVED]

    Perhaps I wasn't clear. There seems to be quite a bit of information on the web concerning using the UART of a PIC to handle MIDI. What have you tried (unsuccessfully) to fix your problem? Off the top of my head, I would be ensuring that the speed, the parity, word length, and number/duration...
  16. (*steve*)

    Sending MIDI signals via PIC's Usart module [SOLVED]

    lmgtfy Does this help at all?
  17. (*steve*)

    Will the Arduino softwareSerial and Servo libraries produce interrupt clashes?

    Presumably the best way us to use the UART rather than software serial support. That way you're least likely to disrupt (or be disrupted) by any funny business the other library is doing.
  18. (*steve*)

    Unknown capacitor.

    Capacitors rarely increase in value as the fail :-) I suspect that there was an error transcribing the part number. I would be interested in what is to the right of the circuit you show. Is there a zener diode?
  19. (*steve*)

    Problem with Clamp Meter (Benning)

    I would hazard a guess that they connect to the wires coming from the "jaws" of the clamp meter. Surely there are 2 wires somewhere that are not connected to anything?
  20. (*steve*)

    Repair Vintage DC Power Supply, Sorensen DCR-B series 2700-Watt 600-4.5B

    Try some heating elements. You may have to place them in series/parallel. At a pinch, get 13 or 14 10Ω 200W resistors and place them in series. They will also have to be mounted on a heatsink. Ensure they're rated for at least 1000V between the terminals and the case. As a bit of a hint...
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