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Recent content by goolash

  1. G

    Op amp selection

    Yeah, I was thinking about that, but I don't know how to write assember, nor do I have any means of burning my own proms.
  2. G

    Op amp selection

    Well, the simulations all panned out, but when I actually assembled the circuit, the op amp began operating like a switch. The output voltage is 3.4V until I reach about 4V input, and then it jumps to 10.3V. Is the LM324 the wrong op amp to be using here? Update: nevermind, after checking...
  3. G

    Op amp selection

    Ok, so I took your suggestions, and with the help of a java-based circuit simulator, came up with the following: **broken link removed** With input @ zero. **broken link removed** Input at 6Vdc. **broken link removed** Input at 12Vdc. I notice already that I forgot to tie in one...
  4. G

    Op amp selection

    Yeah, I've been seeing some of these things in a cheap java-based circuit simulation I've been running. How large of a resistance would be good to put in front of the diode? Enough to draw the full forward current at 12Vdc?
  5. G

    Op amp selection

    **broken link removed** There it is. The purpose of the overall design is to gradually dim a blue LED as Vf rises from 0 to 6Vdc, while gradually brightening a green LED, then gradually brighten a red LED from 6 to 12Vdc, while gradually dimming the green LED. The net effect will be a...
  6. G

    Op amp selection

    I'll scan them and put them up, once they're in a legible state. I doubt I'll need rail-to-rail. I plan on supplying +12V only, with the V- connected to ground. The output voltage will range from 0 to 3.5V only, to drive a 3.5V LED. If it can't quite output 0V exactly, that's fine, this...
  7. G

    Op amp selection

    I am trying to decide what sort of op amp to use for an LED lighting project. It is a variable 6-12 Vdc to 3.5-0 Vdc very slow changing signal conversion (the 6-12 Vdc is an analog signal created by a temperature sensing device), so I have no bandwidth requirements, but the opamp needs to use...
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