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  • Users: djs
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  1. djs

    IoT home router

    I now have 6 IoT devices on my home network. This network is fed from the FIOS ISP router which probably has not in years. So I am looking into purchasing a new router. I want some level of protection for the IoT devices, most of which will not get updated. In doing some research there are three...
  2. djs

    Ultrasonic level distrubances

    I have an ultrasonic level measuring system that consists of two transducers mounted in a wastewater wetwell, each connected to it's own transmitter. We are getting occasional distrubances similiar to that shown on the attched file. The signal ramps up linearly for about 15 minutes and then...
  3. djs

    Lowpass filter oscillations

    Hello; I have designed and built the attached amplifier/ lowpass filter. The circuit works pr say, however the low pass filter starts to have a small oscillation when its output approaches 2 volts. the period of the oscillation is about 14 us. U4 power supply pins are bypassed with 0.1 uf...
  4. djs

    High speed test stand motor

    I have a potential customer that is looking for a high speed, high power variable speed motor for a test stand. They need around 700 Hp at 6000 RPM. I have as potential suppliers Reuland Electric, Electric Apparatus Comapny and Calnetix. Can anyone give me some other leads?
  5. djs

    Free chlorine sensor

    Does anyone on this list know of a supplier of a free chlorine sensor? It needs to be able to handle Cyanuric Acid in the solution. Hopefully reasonably priced (under $1000). I do not need the electronics.
  6. djs

    ADC over sampling

    Does anyone have any hands on experience with this concept. An explanation can be found attached to this post. I am looking into an application where I will need 12 bits of resolution and most microcontrollers have only a 10 analog to digital converters.
  7. djs

    Digital filters

    Hello; Does anyone have links to simple implementations in "C" VB or the like for discrete, digital filters? I have an implementation of a single order low pass filter I found on a previous thread.
  8. djs

    VBA and AutoCAD objects

    I am writing a VBA porgram in AutoCAD to modify some existing drawings. In particular the program is updating the attribute data for some block references. I have found out how to access the text data and update it once I have the block reference. The problem is that the block references...
  9. djs

    Print preview not same as actual plot

    Hello; We have installed AutoCAD 2002 and 2002LT on several of our machines. We are having trouble getting drawings to print or plot correctly. We are printing to eithet an HP Laserjet 5SiMX or an HP Laserjet 8100DN. We routinely do a print preview to check that the drawing will print...

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