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  1. siriustech

    Out of range detection

    Thanks guys, All your ideas are interesting. Higgler you're right in the application, it's not a measuring device but one that will just let me know when something has left a predetermined area. I'm an electrical engineer by occupation so my knowledge in RF is limited but I'm willing to do...
  2. siriustech

    Out of range detection

    I need to develop an out of range detection device. When the reciver/transmitter moves out of range from a "base station" it would trigger an event. The range would need to be variable from 3 ft to 15 ft (+/- 20%) and any "line of sight" option will not work. I researched RFID however since...
  3. siriustech

    temperature compensated LED driver

    Hi guys: I'm developing a colorimeter using a LED as a light source. After building my first prototype and testing I've found that I'm getting slight changes in luminous intensity from the LED with changes in ambient temperature. Before I try to develop a temperature compensated LED driver I...
  4. siriustech

    amplifier circuit?

    Thanks skogsgurra and logbook... You guys got me thinking in the right direction - I had a serious case of mind block yesterday.
  5. siriustech

    amplifier circuit?

    Hey Guys, I need a circuit to do the following: I have a signal which varies from 4.5 VDC to 5 VDC. I need it to transform it so it varies from 4.0 VDC to 5 VDC. Current is always below 10 mA. FYI: The signal is applied to a 12-bit A/D converter. I'm trying to increase the span of the...

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