In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Peter,
  I tried using the comparitor, but it was really touchy. 
  It wasn't that exact circuit, but something similar.
  I decided it was more trouble than it was worth and just put the LM1881 on the board.
  The new overlay board uses the EL1883 because it can run from 3.3V.

Bean.

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