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  1. B

    I need a really small, really smooooth motor...

    Don't know how you are going to get info from a moving sensor. Hall effect would be a better option as long as you use say rising edge and that point is known. Not sure if a "ring" of light would be absolutely necessary if you are looking for "turn on...turn off point". Many unforeseen problems...
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    Battery charger

    As far as I'm aware PTC is a thermistor. Are you refering to some other unknown device? What type of battery are you working with?
  3. B

    Burned a solenoid with a relay timer, and I don't know why

    The way you have it drawn........ PSU ....AC or DC? From your statement the solenoid is DC.(no further detail supplied..i.e. pulsed or continuous operation to change state? or is it indeed AC?) Relay is shown as AC.(spec say it could be either in a large range of voltages) Drawing shows relay...
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    LM317 2N3055 Variable Circuit Problems

    Google is your friend.
  5. B

    I need a really small, really smooooth motor...

    Yes, that was my thoughts when I said about driving a lower voltage motor (say 6v) with pwm from 12v. (Along with the flywheel) Some good points there Hevans. :)
  6. B

    I need a really small, really smooooth motor...

    Backlash is only an issue if you are reversing the drive or/ if the load is insufficient for the drive. As I commented and also Steve above, if you use a heavy disc, the load will stabilise the motor speed. Flywheel effect. :)
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    Light dimmer Capacitor help??

    Another vote for the triac.
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    LM317 2N3055 Variable Circuit Problems

    Pop used to say it's ok to be known as a professional but never let them call you an expert. ex .... out of spurt...drip forced out of a tap under pressure:eek:
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    LM317 2N3055 Variable Circuit Problems

    Cannot see how a short ( cap or otherwise) on the output would cook pots. Given the layout in the specs, I would imagine the 317 would just shut down due to overcurrent which it is designed to do.
  10. B

    LM317 2N3055 Variable Circuit Problems

    There are many things not shown in your photos and as such, many things are assumed by those here as being correct. It may seem unimportant to you BUT you do have the problem and as I see it, these assumptions are the root of the problem. As an example the mix up over the resistor required from...
  11. B

    Looking for Windows 8 and/or 10 compatible USB to serial converter to use with arduino pro mini

    Thats the one....DTR pin brought out.:)
  12. B

    Looking for Windows 8 and/or 10 compatible USB to serial converter to use with arduino pro mini

    These can be a problem if not genuine Prolific. http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41 I use different clone devices (not sure what converter I have now) but there are many alternatives, some with drawback issues as you've found.
  13. B

    Microcontroller project for my pool pumps

    None needed.
  14. B

    LM317 2N3055 Variable Circuit Problems

    Perhaps a second set of eyes on the job, one set reading out the point to point wiring, the other checking. Works sometimes.
  15. B

    Microcontroller project for my pool pumps

    Back in #13 you said your tranny was 20va ...??? Anyhow, why muck around , you have 110v (or 240 for that matter) with an isolation relay on the micro, so why not use that on a similarly powered pair of contactors. Just a noter that contactor coils are like motors, large inrush currents at...
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    LM317 2N3055 Variable Circuit Problems

    Another piece of advice.....not a good idea to connect a microcontroller charger to a supply that is above the rated input let alone one that is diy with problems. Otherwise you stand a good chance of smoking that as well.
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    how to reduce the current without changing voltage for charging a 9 v battery??

    With the 317 a minor adj at the pot will cover any number of cells from 1 to 6
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    how to reduce the current without changing voltage for charging a 9 v battery??

    An LM317 set up as an adjustable constant current charger can work ok with nimh but you will ned a higher output voltage for your pack size. This is just one of many....http://www.electronicecircuits.com/electronic-circuits/simple-ni-cd-battery-charger
  19. B

    Battery doesn't power microcontroller as expected

    As Bob says, this is never a good idea and will only end badly. In case you are not aware, electricity travels at the speed of light (186,000 miles per second). I doubt you are quicker than that.
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    LM317 2N3055 Variable Circuit Problems

    Can't follow what you are trying to do. Those Turnigy chargers take an input from 11 to 17v and have their own microcontroller to give appropriate output to whatever battery type one is charging. Why you want to feed it with a voltage regulated supply is beyond me.
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