Some like the qrp12 peak around 610 nm. Anyone know who made the sensor ?
On Tue, Sep 9, 2014 at 1:42 PM, Chuck Harris <[email protected]> wrote: > 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 >> > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
