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| I am currently trying to put together an IR collision avoidance system..... I'm using the HOA2498-002 IR diode/transistor package which is hooked up to a darlington pair (increased sensitivity) Using a digital output to turn on the diode via a (...) (27 years ago, 5-Apr-97, to lugnet.robotics.handyboard)
| | | | | Re: analog header
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| (...) This is known as an 'impedence mismatch'. Basically your NPN amplifier is incapable of driving the analog input low (which in itself seems a bit weird since you only need to sink .1 mA to do that which suggests that perhaps there is feedback (...) (27 years ago, 5-Apr-97, to lugnet.robotics.handyboard)
| | | | | Re: analog header
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| Certainly the voltage follower will work. But I had a similar problem adjusting the sensitvity of a photocell that I solved by paralleling a pullup resistor of my own to get the proper impedance. You might try putting a 1 ohm (yep, thats one NOT 1k) (...) (27 years ago, 5-Apr-97, to lugnet.robotics.handyboard)
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