On 5/5/2016 11:04 AM, Isaac Marino Bavaresco wrote: > Em 05/05/2016 11:06, Neil escreveu: >> I could possibly add the zener (or equiv clamp) on the input side. > Yes, but this time with a higher Vz, so it will interfere less with the > signal. Right... since I'm amplifying, the voltage at the input would be lower, al= lowing me more overhead between my 0.5V max need and zener voltage (around = 3.3V). And I'll tinker with the LED idea to see if that nets me less corru= ption of the signal. On my way out the door this morning a quick rummage through my samples bin = got me an MCP6141 and MCP6042 op-amps. I didn't have the time to pull up d= atasheets before I left town, but hoping one of these will work at 3.3V. Cheers, -Neil. =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .