The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "John Jardine"
Subject: Re: My CDS cells are shorting out! (part two)
Date: Fri, 22 Nov 2002 00:54:13 -0000
NNTP-Posting-Date: 22 Nov 2002 00:42:39 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
X-MIMEOLE: Produced By Microsoft MimeOLE V5.00.2615.200
KILOWATT wrote in message
> Thanks for you input Wafer. But there must be
> a way to properly seal the cell without the need
> to change it for a phototransistor...any idea?
> I would like to face the problem as it is. I mean, cds
> cells are employed in many circuits through the industry
> when high speed response to light is not needed...
> > Change to an infrared sensor and you'll be all set.
Had used a Chinese made outdoor CDS sensor/light switch for 4 years no
problem. Torch sized it consisted of a diffuse sky pointing dome, a CDS
sensor about 1inch across, in series with a bimettalic switch and directly
connected to the 240V mains via the light bulb.
Your circuitry is perfectly OK. The problem points directly to be the
physical style of sensor you are using. The cracked and frosted cell window
indicates moisture ingress sufficient that the particular type is useless in
outdoor conditions. I'd try one of the larger ORP71? (only from memory) type
cells. These are fully resin encapsulated with no obvious moisture ingress
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup