Search found 15 matches
- Tue Nov 18, 2003 12:54 pm
- Forum: General Discussion
- Topic: Oversensitive 555 monostable multivibrator
- Replies: 5
- Views: 3582
Re: Oversensitive 555 monostable multivibrator
What are you doing with pin 5?
- Fri Oct 24, 2003 6:05 am
- Forum: General Discussion
- Topic: Schematic Software
- Replies: 6
- Views: 3990
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!
- Thu Oct 09, 2003 6:35 pm
- Forum: General Discussion
- Topic: Temp Sensor
- Replies: 5
- Views: 3473
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...
- Thu Oct 09, 2003 7:03 am
- Forum: General Discussion
- Topic: Temp Sensor
- Replies: 5
- Views: 3473
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...
- Thu Jul 17, 2003 11:40 am
- Forum: General Discussion
- Topic: Project
- Replies: 6
- Views: 4580
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.
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.
- Thu Jul 17, 2003 11:25 am
- Forum: General Discussion
- Topic: Ni Cad chargers help
- Replies: 15
- Views: 9285
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...
- Thu Jul 17, 2003 10:57 am
- Forum: General Discussion
- Topic: Project
- Replies: 6
- Views: 4580
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...
- Thu Jun 26, 2003 10:10 am
- Forum: General Discussion
- Topic: Timer Chip
- Replies: 5
- Views: 3542
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.
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.
- Sat Jun 07, 2003 11:07 am
- Forum: General Discussion
- Topic: WIN98SE (OEM)
- Replies: 1
- Views: 1525
WIN98SE (OEM)
I would like to purchase WIN98SE -- full install, not upgrade version. Anyone have it?
Thanks a bunch!
Thanks a bunch!
- Fri May 17, 2002 12:04 pm
- Forum: General Discussion
- Topic: Trac fone Nokia 5165
- Replies: 4
- Views: 3491
Re: Trac fone Nokia 5165
The 5165 is a later model -- older ones are worth next to nothing.
- Fri May 17, 2002 9:20 am
- Forum: General Discussion
- Topic: Trac fone Nokia 5165
- Replies: 4
- Views: 3491
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?
- Fri May 10, 2002 12:13 pm
- Forum: General Discussion
- Topic: Parabolic Microphone
- Replies: 13
- Views: 9251
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?
- Wed May 01, 2002 9:45 am
- Forum: General Discussion
- Topic: Prepaid Cell Phones
- Replies: 2
- Views: 2494
Prepaid Cell Phones
Hello:<p>Just wondering if anyone had any suggestions or
ideas regarding which prepaid cell phones & plans
are best?<p>Thanks!
ideas regarding which prepaid cell phones & plans
are best?<p>Thanks!
- Sun Mar 10, 2002 5:22 am
- Forum: General Discussion
- Topic: CR-123A batts
- Replies: 1
- Views: 2331
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!
- Wed Dec 26, 2001 6:33 am
- Forum: General Discussion
- Topic: (Optical) Motion Detector
- Replies: 1
- Views: 3224
(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...