Search found 15 matches

by Buford
Tue Nov 18, 2003 12:54 pm
Forum: General Discussion
Topic: Oversensitive 555 monostable multivibrator
Replies: 5
Views: 1494

Re: Oversensitive 555 monostable multivibrator

What are you doing with pin 5?
by Buford
Fri Oct 24, 2003 6:05 am
Forum: General Discussion
Topic: Schematic Software
Replies: 6
Views: 1456

Schematic Software

What's a good, easy-to-use shareware/freeware program for creating electronic circuit schematic diagrams? I would like one which will provide graphic output in a common format, such as GIF.<p>Thanks!
by Buford
Thu Oct 09, 2003 6:35 pm
Forum: General Discussion
Topic: Temp Sensor
Replies: 5
Views: 1342

Re: Temp Sensor

That's along the lines of what I was thinking -- wonder if anyone has experience with some of the temp sensing diodes like the ones from National Semi? When I did something somewhat similar seveal years back, I used a couple of comparators and a thermistor. The special diode should be better (more l...
by Buford
Thu Oct 09, 2003 7:03 am
Forum: General Discussion
Topic: Temp Sensor
Replies: 5
Views: 1342

Temp Sensor

I'm looking for a little ciruit to light one of three LED's in response to temperature, using a small probe. One LED should light if the temp reaches approximately (somewhat user adjustable) 80 degrees F, a second LED should light at 90F, and a third should light at 100F. Input on sensors and dedica...
by Buford
Thu Jul 17, 2003 11:40 am
Forum: General Discussion
Topic: Project
Replies: 6
Views: 1962

Re: Project

Bob:
I didn't give all the specifics because I didn't what to take up that much space on the board. There are a couple of temp points (around 176F), and several timing cycles. Nothing too complicated, just details. I can email the full description to anyone interested.
by Buford
Thu Jul 17, 2003 11:25 am
Forum: General Discussion
Topic: Ni Cad chargers help
Replies: 15
Views: 3808

Re: Ni Cad chargers help

Several years ago, I was interested in building a charger for a 9v rectangle rechargeable replacement, and did a little study of the subject. NiCADs really are much more quirky than anyone might suspect at first glance. I mean they've been used for years and years in a host of consumer and industria...
by Buford
Thu Jul 17, 2003 10:57 am
Forum: General Discussion
Topic: Project
Replies: 6
Views: 1962

Project

I wonder if someone would be interested in a little project I've been considering. It involves temperature and time control of a low-voltage DC relay with 20A @ 120VAC DPDT contacts. I considered simply hard wiring a circuit using timer chips and related parts, but the multiple temp and time trigger...
by Buford
Thu Jun 26, 2003 10:10 am
Forum: General Discussion
Topic: Timer Chip
Replies: 5
Views: 1435

Timer Chip

I'm looking for a chip to implement a long-range (approximately 3 minutes to 30 minutes) interval timer function.
It should be compatible with digital logic, having an edge-triggered start pin and enable/disable input. Two modules in a single chip would be ideal.
by Buford
Sat Jun 07, 2003 11:07 am
Forum: General Discussion
Topic: WIN98SE (OEM)
Replies: 1
Views: 537

WIN98SE (OEM)

I would like to purchase WIN98SE -- full install, not upgrade version. Anyone have it?
Thanks a bunch!
by Buford
Fri May 17, 2002 12:04 pm
Forum: General Discussion
Topic: Trac fone Nokia 5165
Replies: 4
Views: 1261

Re: Trac fone Nokia 5165

The 5165 is a later model -- older ones are worth next to nothing.
by Buford
Fri May 17, 2002 9:20 am
Forum: General Discussion
Topic: Trac fone Nokia 5165
Replies: 4
Views: 1261

Trac fone Nokia 5165

Hi:<p>Does anyone have a good Nokia 5165 cellphone programmed for Trac Fone prepaid service they would like to sell?
by Buford
Fri May 10, 2002 12:13 pm
Forum: General Discussion
Topic: Parabolic Microphone
Replies: 13
Views: 3387

Parabolic Microphone

I am interested in building a small parabolic microphone. I've seen plans in electronic mags before, and possibly in Nuts & Volts.<p>Anyone have any good ideas?
by Buford
Wed May 01, 2002 9:45 am
Forum: General Discussion
Topic: Prepaid Cell Phones
Replies: 2
Views: 1028

Prepaid Cell Phones

Hello:<p>Just wondering if anyone had any suggestions or
ideas regarding which prepaid cell phones & plans
are best?<p>Thanks!
by Buford
Sun Mar 10, 2002 5:22 am
Forum: General Discussion
Topic: CR-123A batts
Replies: 1
Views: 1098

CR-123A batts

Hello:<p>I am interested in a source for CR-123A (photo) batteries. The ones in the stores are so high-priced, there must be something cheaper.<p>Thanks!
by Buford
Wed Dec 26, 2001 6:33 am
Forum: General Discussion
Topic: (Optical) Motion Detector
Replies: 1
Views: 1483

(Optical) Motion Detector

I'm looking for a very low power, sensitive, stable circuit fragment to detect motion at a distance of approximately 1 1/2 to 2 inches.<p>The sensor should work equally well in daylight or total darkness, and interface with digital logic, operating in the range of 5 to 12 VDC, with a current drain i...