Search found 124 matches

by Bern
Wed Nov 23, 2005 9:34 pm
Forum: General Discussion
Topic: IR sensor
Replies: 23
Views: 4714

Re: IR sensor

Thanks Stephen, that looks like the baby. Now I am looking for a source. I have checked several places, both normal supply catalogs, and surplus houses. No luck yet. The problem is I only need a few at this point. -- Thanks
by Bern
Tue Nov 22, 2005 2:04 pm
Forum: General Discussion
Topic: IR sensor
Replies: 23
Views: 4714

Re: IR sensor

I need a motion detector, not a light detector. That is why I am looking for IR sensors, like used in security lights, etc.
by Bern
Mon Nov 21, 2005 10:41 pm
Forum: General Discussion
Topic: IR sensor
Replies: 23
Views: 4714

Re: IR sensor

My application is very similar to the conventional detectors for turning on night lights for security, etc. If I could find out what IR sensor they use, that would be great, since I need several of them. Using them as they come in that application along with the price, doesn’t cut it. For my prototy...
by Bern
Wed Nov 16, 2005 7:32 pm
Forum: General Discussion
Topic: IR sensor
Replies: 23
Views: 4714

IR sensor

Thanks all for the help in the past. Now I came up with another Q. --- Need help selecting an IR sensor. I realize there are a lot of IR sensors, and I have checked several and not come up with what I need. The ones you normally find are two wire devices. The ones found in motion detection equipment...
by Bern
Tue Nov 15, 2005 10:56 pm
Forum: General Discussion
Topic: A linear gate?
Replies: 8
Views: 1702

A linear gate?

Anybody have any experience using a CMOS gate (4001,4011) in a linear mode? How well does it work?
by Bern
Mon Nov 14, 2005 10:17 pm
Forum: General Discussion
Topic: Low Pwr OpAmp
Replies: 3
Views: 898

Low Pwr OpAmp

I am looking for the lowest power Op-Amp I can find at a reasonable price. Supply voltage 2 ½ to 5 volt. Prefer standard dual inline package. --- Thanks All.
by Bern
Thu Nov 03, 2005 2:53 pm
Forum: General Discussion
Topic: Artificial fire sounds
Replies: 8
Views: 1765

Artificial fire sounds

I have cut and carried wood for almost seventy years. I am now getting lazy, and our new home has a very nice (gas) fireplace. We enjoy it very much, but it just isn’t the same. Thinking about building a circuit to at least simulate some of the noise of a real wood fire. You know, the crackle, pop, ...
by Bern
Mon Oct 31, 2005 12:21 pm
Forum: General Discussion
Topic: Latching Relay
Replies: 5
Views: 1989

Latching Relay

Quick question on Latching Relays. I need a latch that does not need continuous power. I want to be able to pulse it on, and pulse it off. In looking at latching relays on Goldmine and AllElectronics, they have single and double coil units. In their descriptions I find it unclear how they operate. I...
by Bern
Sat Oct 01, 2005 10:08 pm
Forum: General Discussion
Topic: ISD recording chips
Replies: 3
Views: 1443

Re: ISD recording chips

Thanks, but nope. I am in Washington state, USA.
by Bern
Sat Oct 01, 2005 10:08 am
Forum: General Discussion
Topic: ISD recording chips
Replies: 3
Views: 1443

ISD recording chips

Looking for a source, to buy ISD speach chips in small quantities. Anybody know where they are available? Thanks!
by Bern
Thu Aug 18, 2005 6:35 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4458

Re: Dew Point

Hey Will, I think you are on to something. I can take it one step further. If I have a monitoring chamber connected to the chamber of concern so they are basically the same temperature, with a very small airflow at all times in the monitoring chamber, now all I have to do is measure the humidity in ...
by Bern
Wed Aug 17, 2005 10:10 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4458

Re: Dew Point

Sorry, boy did I mess that up. Would you believe I want the fan to turn off when the enclosure temperature is 45 degrees, and the DP is 40. Got my numbers reversed.
by Bern
Wed Aug 17, 2005 10:03 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4458

Re: Dew Point

Sorry if I made it confusing. I have an enclosure that I will be moving air thru with a fan. This system will be getting air from the outside environment. I want to shut the system down (turn the fan off) before the DP gets close to the temperature of the enclosure. I live in the NW, and we have a l...
by Bern
Tue Aug 16, 2005 10:39 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4458

Re: Dew Point

Chris, now you got me thinking, and that is scary. --- For this application one possibility would be to find a low power Peltzer junction and mount the hot side to the wall that I am concerned about. Now if I mount a moister detector to the cold side, and pump enough power to keep the temperature ac...
by Bern
Tue Aug 16, 2005 10:09 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4458

Re: Dew Point

Chris keep up the ideas, however you lost me on the last paragraph. How can the fan increase and decrease the humidity over the sensor to make it more or less sensitive? I can maybe see if the fan added heat to the airflow, it would decrease the humidity, is that what you are thinking? That however ...