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  1. (*steve*)

    How can we Improve EP in 2017?

    One other forum I've used allows members to vote :-( :-| :-) or :-D A members ranking comes from some combination of the number and recency of these ratings. Even though each member only gets one vote, their recency make a difference, so continually voting for someone doesn't change the...
  2. (*steve*)

    What's wrong with circuit?

    There are all sits of signals and noise on the mains that could trigger this circuit. An isolation transformer would attenuate these somewhat. Long wires will act as antennae to pick up more interference :-(
  3. (*steve*)

    Good soldering gear for occasional use?

    Tips that look like a small screwdriver are my choice for general purpose work. If you really want something small, look at the 60W 24V (I think) microcontroller controlled devices. I used one yesterday for some serious work and I was impressed. The main drawback is the need for an...
  4. (*steve*)

    New (NOS) switches with contact problems -how to fix?

    Yes, for moderate currents, the small amount of sparking which occurs as the switch closes actually cleans the contacts. For very low currents you need material that doesn't tarnish (gold) "Need" is a relative term. :)
  5. (*steve*)

    Which switch?

    Sorry about that @notTHEfoggiest I followed up my post by doing that exact search. I noted that many of the switches shown on eBay with this search are NOT 6 pole switches. You need to be careful to check that the description actually states those words in that order. Perhaps including then...
  6. (*steve*)

    Nixie tube clock: display flickering, buzzer crackling

    The sound is allegedly coming from a buzzer on the board. However I concur with Harald's suggestion.
  7. (*steve*)

    Which switch?

    6 pole switch.
  8. (*steve*)

    Which switch?

    The current through those connections should be quite small. Look for a 6 pole switch. Unless it's actively doing any balancing, the inputs will be high impedance and draw very little current.
  9. (*steve*)

    Best way to detect what power source is connected?

    Sky == Supply when you get but by autocorrect. And but == hit Aaaaagh! A voltage divider will load down the voltage which is supplied by a low current boost circuit. Not a good idea in this case. I'm thinking a P Channel jfet might be the answer.
  10. (*steve*)

    Help with diode OR gate

    It looks like you're just isolating two power sources. In that case there is no need for a resistor to ground. What are you powering from this? The first time I read your post I didn't understand. I read it as you wanting "a diode or a gate". Now I read it as "a diode OR gate" Ship sails...
  11. (*steve*)

    Best way to detect what power source is connected?

    It's a tricky problem because the gate voltage is driven higher than any supply rail in the circuit
  12. (*steve*)

    New (NOS) switches with contact problems -how to fix?

    Beware that there are some tact switches out there which will be destroyed by some types of contact cleaner. (I may shortly be posting a thread asking if anyone has seen similar tact switches :-( ) My recommendation is to use contact cleaner, but to carefully try it on one tact switch before...
  13. (*steve*)

    Physics Project Timer

    This should have been one of your first questions. There are several ways to stop a motor: Have some form of brake (probably not possible for you -- and can skid) Remove power (motor will coast) short out the motor (great option, can't skid) reverse power to the motor (can skid, and can...
  14. (*steve*)

    Not your typical Up / Down Counter - Need Help

    No, one 555 clocks the shift register, the other determines if the input bit will be high or low.
  15. (*steve*)

    Physics Project Timer

    This project will probably take you a couple of weeks to plan test, and refine. Perhaps you can go back in time? I recommend you continually read the distance sensor and turn the motors off when at distance X from the wall. Adjust X so the car stops before it hits the wall. Different...
  16. (*steve*)

    Not your typical Up / Down Counter - Need Help

    A shift register and a couple of 555s could do what you want. A microcontroller might be easier.
  17. (*steve*)

    struggling to learn basics - 555 timer led flasher

    Yes. They are drawn this way on circuit diagrams to make them easier to understand, tidier, and to follow important conventions. Following on from the comments earlier... When polarity was assigned it was an arbitrary decision. When the direction of flow of current was first assumed, it was...
  18. (*steve*)

    translating schematic for device variant

    Well, note you are showing the switch also connected to some other IC. I don't know if that will like a bouncy input. If the switch was there previously then it is probably not a concern.
  19. (*steve*)

    Heatsink

    See here https://www.electronicspoint.com/resources/do-i-need-a-heatsink-how-big.29/
  20. (*steve*)

    Heatsink

    In most normal circumstances adding a heatsink reduces the junction temperature because the thermal resistance between the junction and the ambient environment is reduced. Have a look in the resource section. We have a partially completed resource on heatsinks that might help you.
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