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  • Users: ritchie888
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  1. ritchie888

    Connector power rating for battery

    This may come across as a stupid question, but I'll see what I get anyway. I am looking at connectors for my circuitry in which the battery will connect to. The battery is 1100mAh (1.1Ah) and the connector I'm interested in has a rating of 1A. Immediately I can see that the battery output is...
  2. ritchie888

    Swiss machine header pins - right angle

    Hi all, Sorry if this is in the wrong forum, but I really need to find some Swiss machine header pins, but at a right angle. I know they exist, I've seen a few Chinese companies showing images, but cant see how to purchase from them. Can't find them on Digikey or other large component...
  3. ritchie888

    Why wont filtering work?

    I'm hoping someone will be able to tell me why no filtering is helping in my application. I have a MEMS microphone monitoring the pressure of a small chamber, which has a membrane stretched over the far end. This device is placed on a human muscle and when I flex said muscle the membrane is...
  4. ritchie888

    Determine Vout

    I have, what I'm sure is a very simple circuit, and I need to determine Vout from the design attached. I'm sure I have to do superposition and use a potential divider, but I can't seem to get the answer given. Anyone that can push me in the right direction? Cheers
  5. ritchie888

    Bluetooth transmission

    I was hoping someone could direct me towards a device or suggestion to solve a problem of mine. I have an inertial measurement unit which can collect and transmit its data via Bluetooth. Normally I'd have this communicating with a laptop which would have either a Bluetooth dongle or built in...
  6. ritchie888

    Low frequency preamplifier

    I'm trying to design a pre-amplifier for low frequencies. I'm specifically interested in 2-200Hz. I'm fairly sure I have the right design, just the values of the components must be wrong. Having done some math, I'm under the impression that my circuit should work for my frequencies, but...
  7. ritchie888

    How to accurately measure rotation?

    I need to know the type of component I should use to determine the rotation of a shaft. Basically, I'll be building a pendulum which will hang down at 0' (due to gravity) with an axle at the top of it where I'll also mount the sensor (basically I'll look like the face of a clock with only one...
  8. ritchie888

    Timed digital output - DAQ Assistant

    I have a very simple application with a USB-6211. I'm using two digital outputs (PFI4 OUT, PFI5 OUT) and want to do the following task. 1) turn PFI4 on (high), thus creating a voltage and turning my device attached to that pin on. 2) wait one to two seconds. 3) turn PF15 on (same as PFI4). 4)...
  9. ritchie888

    Recommendation of pressure/vacuum valve manufactures

    Hey all, I need some advice and recommendations on what to search for in regards to my project. The best way to think of my project is to think of inflating and deflating a balloon. I will have a partially inflated balloon of which I need to use a vacuum valve to suck all the air out and...

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