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  1. K

    Ideas/ design needed for sound system on a childrens bed

    The first consideration is a system lockout for bedtime. ;) Ken
  2. K

    Help a beginner with a relay problem

    This is about the cheapest I've found. 1A maximum load, but drops ~3 volts at that current. http://www.kimcontrols.com/item/Q1T00005316 Ken If you want to build your own, look at circuit #2: http://home.cogeco.ca/~rpaisley4/LM555.html#29
  3. K

    Help a beginner with a relay problem

    Can you change the relay, or insert another relay to control the original? What you need is a delay-on-make relay. http://www.artisancontrols.com/pdf/2410sa.pdf How much voltage/current does the original relay switch? Ken
  4. K

    Microwave Oven capacitors

    Hand to hand is across your heart! Left hand to right leg is across your heart. Right hand to left leg is across your heart. Left hand to left leg is across your heart. The actual current path"s" across your body spread out sort of like magnetic lines of force, each looking for the most...
  5. K

    Microwave Oven capacitors

    Kind of like asking how much TNT is needed to hurt or kill you. Many variables...but how close do you really want to get to find out? Ken
  6. K

    electronics question

    ...no... Ken
  7. K

    Variable speed pump for shower

    Then maybe you want to try something like this: http://www.designnotes.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=K2636&Category_Code=tic There are a lot of vendors with different prices if you Google: K2636 Be aware that you will now be dealing with showers and electricity. Can be...
  8. K

    Variable speed pump for shower

    I'm a little confused by your answer. SCRs and TRIACs are both thyristors. SCRs can conduct only on one half of the AC voltage cycle. TRIACs can conduct on both haves. Either can be used for controlling the right kind of motor. Series wound or universal motors (brush-type) work well with SCR...
  9. K

    How to detect electric motor slowing down?

    Here' a circuit that might work for you. Start delay is set by R1/C1/Q1. Over-current detect is set by R3/R4/U1/R6 Over-current stop delay is set by R5/C2/Q2 RLY1 is power-on/power-off latch No values for R2/R3/R4 because of no motor data R1/C1 (~2 sec) and R5/C2 (~1 sec) timing values are just...
  10. K

    How to detect electric motor slowing down?

    OK, so there will be several duplicate motor circuits. Is the motor spec'd for 3-12V/0.5A, or are you supplying 3-12V for variable speeds? This is the supply I'm referring to. This also brings up what supply is available to power the electronics. Do you know, or can you measure the starting...
  11. K

    How to detect electric motor slowing down?

    Again...no details! How many motors? What voltage and current? What starts the motors? What happens after motors stop? What power supplies are available.........?????? If this is going to be one of those projects where you want to keep it a secret, but you want someone to solve for...
  12. K

    How to detect electric motor slowing down?

    Long stories are good. They often help us solve your problem rather than trying to solve your solution. ;) Ken
  13. K

    Variable speed pump for shower

    Wouldn't a simple valve on the water line to control flow be much cheaper and easier than trying to add a variable speed pump/controller? Ken
  14. K

    Momentary Push Buttons

    "there are a variety of buttons" Is this an existing panel that you're attempting to interface with the voice activation module? Do you have a schematic of the panel? Are you intending to parallel the existing buttons with the voice module outputs? Ken
  15. K

    Momentary Push Buttons

    Not sure what's in the panel, but i bet that the toggling of the LED (and associated function) is due to the associated circuitry, not the "momentary" membrane switch. Ken
  16. K

    newbie here seeking help .. what is this part?

    Picture #4 shows the manufacturer's name: AMP AMP is now manufactured by TYCO. What other numbers are on the shell? You might want to contact TYCO: http://www.tycoelectronics.com/customersupport/support.asp However, it's probably a custom connector. Ken
  17. K

    ECG circuit development

    "But in actual sense, its difficult operate in that mode" Did you look at Figure 37? What's difficulty that your encountering? Ken
  18. K

    How to hook up a blinking light to an intercom?

    http://www.electronickits.com/kit/complete/elec/k126.htm or http://www.canakit.com/vox-voice-activated-switch-kit-ck257b-uk257b-ck257-uk257.html plus a 12V/1A wall wart. Put the mic at the intercom speaker. The relay could switch a 12V lamp...like a trailer marker...
  19. K

    Another timer thread

    An off the shelf electromechanical timer with 15 minute minimum cycling (#7993K42) http://www.mcmaster.com/#timers/=92l7cz An interval time relay (#7457K65) connected to the timer :http://www.mcmaster.com/#timer-relays/=92l5kc You didn't say what the current draw of all the display parts is...
  20. K

    Another timer thread

    Does the current pushbutton arrangement require that the button be held in for 5-10 seconds, or is it just pushed momentarily to start the display? ken
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