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  1. K

    Tool-activated vacuum

    Many years ago I had that problem.But starting the saw and the vacuum at the same time would trip the breaker in the panel. I made a circuit that sensed the saw current and delayed the start of the vacuum by an adjustable delay of a couple of seconds. I also added an adjustable delay after the...
  2. K

    Best Ideas for a DC Powered Motor Rod Rotator

    All info is welcome. Photos and sketches beat the 1000 works. :) Ken
  3. K

    Tool-activated vacuum

    Did I miss something? Why not a 240VAC relay in parallel with the saw? Use the contacts to switch the vacuum on and off with the saw switch. Ken
  4. K

    How does this cable connect exactly?

    "Magnet wire" is solid wire with an enamel coating for insulation. Ken
  5. K

    Vacuum in a Can

    You gave no indication on the level of vacuum or flow rate need for your "projects". Maybe roughing and diffusion pumps are what your looking for? The devil's in the details! :( Ken
  6. K

    Vacuum in a Can

    Another option is a water aspiration vacuum pump: https://www.amazon.com/Nalgene-6140-0010-Aspirator-Polypropylene-Threading/dp/B003OBYNBO Ken
  7. K

    Help with solar switch

    With a little help this cheap control would likely work: https://www.aliexpress.com/item/LM339-DC-12V-2-Channel-Window-Comparator-Module-Undervoltage-Overvoltage-Protection-Board-Voltage-Detection-Double-Output/32792140484.html?spm=2114.40010708.4.1.a2nCEb You would need a 12v supply (wall wart)...
  8. K

    Help with solar switch

    You might want to opt for something like this: https://www.google.com/search?q=dual+ldr+solar+tracker&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwi_2pHt9OLSAhUpyoMKHVY9AKcQsAQIJw&biw=1600&bih=740#imgrc=MYA1f_2CZAGcfM: The two photocells activate the motor in the correct direction as one receives...
  9. K

    Help design a very simple momentary on/off circuit

    Those 555 circuits have to be powered all the time to do the ON/OFF operation. Is that OK for you circuit? Ken
  10. K

    How would make a smelly flatulence (fart) remover for a person with colostomy bag?

    I'm in your boat. My disposable pouches have a charcoal filter port at the top that is supposed to filter and vent the gas. Problem is, if it gets wet it's useless. Now a colostomy pouch that doesn't get wet inside? Well maybe if you only stand all the time. At home there is a good fan in the...
  11. K

    Kill Switch

    Get one that has a remote control. ;) http://www.ebay.com/bhp/remote-control-golf-cart A cheap wirelese remote would work for start/stop. But, in order to stop if out of range, it would need to be continuously communicating (hearing) with the remote. Ken
  12. K

    Powering my IC

    What will the IC be driving? You would need to add the total drive current to the quiescent current in the calculation of the dropping resistor for the Zener diode. This may help finding the correct resistor: http://www.designworldonline.com/calculators/zener-diode-calculator/ Ken
  13. K

    Rheostat for Kitchen Appliance

    Does the light cycle on and off indicating that it is holding temperature? Ken
  14. K

    Circuit Which Turn On The Light As A Response To A Specific Sound Sequence ?

    Is the beep a fixed frequency tone, or more like a buzzer with lots of harmonics? Ken
  15. K

    Circuit Which Turn On The Light As A Response To A Specific Sound Sequence ?

    What sounds? Ken
  16. K

    Which gas solder

    You will need something like this: https://precision-pcb-services-inc.myshopify.com/products/shuttle-star-sv560-bga-rework-station?utm_medium=cpc&utm_source=googlepla&variant=25742951555&gclid=CL2dmffy4NECFVa2wAodcusOZg Ken
  17. K

    Relay output

    This should work: http://uk.farnell.com/fairchild-semiconductor/mid400/optocoupler-logic-o-p-dip-b/dp/1467846 http://www.farnell.com/datasheets/2183353.pdf?_ga=1.153099760.97767030.1484942284 Ken
  18. K

    Super Simple Circuit questions

    Oh, as I recall from quite a while age, my circuit was for ~20 seconds. You would have to increase C1 quite a bit for 3 minutes. The added resistor would be important on a larger capacitor. Ken
  19. K

    Super Simple Circuit questions

    Jacob, Q1 is a P-Channel MOSFET. (label should have been NDP6020P) With 9 V you could do 6 LEDs. AK, That Mosfet was used for a 3V battery circuit. Changing the circuit for a N Logic level Mosfet would improve availability and cost. Ken
  20. K

    Super Simple Circuit questions

    You will have to play with the R1 and C1 values for 3 minutes. Ken Added Note: the MOSFET should have been labeled NDP6020P for a P channel
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