Recent content by chrishallowell

WATER

I just use a 2N2222 transistor and a DS10A. This gives me wireless detection for under $6. Thanks, Chris

I got the prototype working perfectly. Thanks Frank for all of your help. Thanks, Chris

Yes, you are correct. I mean connect the led probe output to the pc joystick input. "One method would be to use a relay but may require a driver transistor connected to the probe circuit.....Personally i think i would use an opto coupler...." Would the right half of the relay driver circuit...

Yes, it works! Thanks so much! One last hurdle....Connecting this to a joystick input. How would I connect a relay to this to get a contact open/close? I have a bunch of 12VDC Automative relays sitting around. Can I use these or what kind do I need? Thanks, Chris

Thanks Frank. I'll try this when I get home tonight. Thanks, Chris

ok, I get about 20K Ohms when the LED light is on and a 1(Infinite) when it's off. Thanks, Chris

Thanks Frank. I will take the measurements and report them back. Thanks, Chris

I have a CdS photocell(LDR?) and a LM393(Op-Amp?). I have built the Basic CdS Photocell Detector circuit on this page: http://home.cogeco.ca/~rpaisley4/PhotoDetectors.html IC1 = LM393 R1 = (I have tried the full range of resistors with no luck) I have this circuit working for "normal"...

I tried this but it doesn't seem to be sensitive enough to light for my application. I am trying to monitor the mute LED light on an A/V receiver. The LED is not very bright when on. Any circuit ideas on how to make the photocell more sensitive to light? The other option (I would like to...

Here's my setup: Homeseer JR Media Center using 4 Zones with sound card #1. Sound Card #1: Motherboard (AC97) Sound Card #2: Turtle Beach Riviera (S/PDIF) I took the motherboard sound card(AC97 - 8 speakers) and made 4 zones out of it in JR Media Center using the side, rear, center/sub, and...