Hi Dallas, The thing is, CdS cells peak sharply at about 560nm, which is green/yellow. They are blind to most of white light... especially to the blues which are prominent in white LED's.
White LED's are designed purely for bulk illumination. They have a very slow response so that they won't flicker when used for domestic lighting off of a 50/60Hz power source. There are also green yellow and red LED's that are designed the same way, but there are many that switch quickly too. -Chuck Harris Dallas Smith wrote:
Hi Chuck, Its only 84Hz, It had the offset problem long before I made this mod. The new meter at work many decades ago also had this problem. I pick white so the full spectrum would be covered by the Csd's. Checked waveforms with scope, has sharp rising and falling edges. This mod may not be as elegant as a Linear Devices copper mod, but at lest I will not have to mess with the shielded front end. The offset may be due to the bias current in the front end reacting with the different polarities. Dallas
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