Recent content by EverCurious

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    Need a countdown timer that I can breadboard

    It really depends on where your design strengths are. If you are trying to do this with digital components only, avoiding the programmable types of devices, it will be a more complex circuit. The PIC or Microcontroller eliminate complicated circuits by allowing you to use software in place of...
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    Why does sound pitch change when flowing water temp does in pipe?

    Thank you Enthalpy. That is a very viable explanation and makes perfect sense to me. I made another observation. The sound effect is more pronounced as the distance between the valves and the exit point of the water from the faucet increases. (The longer the snout...the easier it is to hear)...
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    Need a countdown timer that I can breadboard

    Sure you do. But depending on how much control you want over the motor's speed, direction, and torque, you will need to use different solutions. You can use a simple 2N2222 transistor and completely saturate it to turn the motor on. You can also send a PWM pulse to same and vary the the motor's...
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    What Are the Best Alternatives to RoHS Restricted Substances in Electronics?

    What is your industry, customer type, and customer location? There are exemptions that you may be entitled to follow if you use BGA packages, press-fit connectors, or other devices where lead is still required for proper assembly and long term reliability. You will still face supply chain...
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    Need a countdown timer that I can breadboard

    To do this with 555/556, pots, and caps is do-able, but will take some work to implement latching and reseting. For this type of activity I use microcontrollers that are programmable via a serial interface. Most microcontrollers have internal oscillators requiring you only have a...
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    Why does sound pitch change when flowing water temp does in pipe?

    First of all...man I love this site. This was my first question and I am impressed. No matter where I have used hot water from a tap, I have always noticed this phenomenon. So, that seems to eliminate contributions from any specific arrangement of the plumbing or the water heater capacity. I...
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    Why does sound pitch change when flowing water temp does in pipe?

    I have always wondered why there is a noticeable change in the sound of water flowing from a pipe when the water temperature changes. When I first turn on the hot water faucet after a long period of being off, there is a steady pitch of sound I hear. I am referring not to the sound of the water...
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