Search found 15 matches
- Thu Jan 23, 2003 3:20 am
- Forum: General Discussion
- Topic: PIR portable alarms
- Replies: 5
- Views: 3935
Re: PIR portable alarms
Thanks EDD and Digitech. Digitech, these are ONLY temporary alarm units used while building the house, for any trespassers, thieves, etc...I have alot of $$$in materials laying around. I also hooked up a temporary phone line that calls out a fixed number when it hears noise. Works real well, and whe...
- Wed Jan 22, 2003 7:25 am
- Forum: General Discussion
- Topic: PIR portable alarms
- Replies: 5
- Views: 3935
PIR portable alarms
Hi,<p>I have purchased a few PIR portable alarms to protect a home that is being built. It is powered by a 9 volt battery and will sound an ultrasonic transducer when activated. What is the easiest way to interface a battery powered light when the alarm sounds? The lights are like those push-on clos...
- Mon May 13, 2002 7:32 am
- Forum: General Discussion
- Topic: GPS Devices To Track Cars
- Replies: 8
- Views: 5576
Re: GPS Devices To Track Cars
Vol 23 No. 3 had an article in Stamp Applications which described interfacing a Basic Stamp to a GPS unit and logging data for tracking. Go to http://www.parallaxinc.com/downloads/Re ... erogps.zip<p>Smitty
- Sat Mar 23, 2002 11:29 am
- Forum: General Discussion
- Topic: More Range from a Frequency Counter
- Replies: 1
- Views: 2409
More Range from a Frequency Counter
I have an Alinco handheld frequency counter. It works great but I would like to detect radio frequencies in the 300-450 Mhz band from a much greater distance. Wothout modification, I can pick up the frequencies from very low power transmitters from about 2 feet. Would a Broadband Preamp like the SA7...
- Sat Mar 23, 2002 11:20 am
- Forum: General Discussion
- Topic: how to build a 24GHz transmitter?
- Replies: 12
- Views: 12293
Re: how to build a 24GHz transmitter?
I have plans for the X band, maybe you can modify it for K or Ku band.<p>Smitty
- Mon Mar 04, 2002 7:38 am
- Forum: General Discussion
- Topic: Battery Acid Leak on Circuit Board
- Replies: 7
- Views: 5094
Re: Battery Acid Leak on Circuit Board
Thanks everyone, your suggestions have been very helpful.<p>Smitty
- Tue Feb 26, 2002 10:45 am
- Forum: General Discussion
- Topic: Battery Acid Leak on Circuit Board
- Replies: 7
- Views: 5094
Battery Acid Leak on Circuit Board
I have a bunch of devices I bought surplus, most have button cell watch batteries pre-installed and have leaked. Several of the items don't work, some do work. Is there any kind of cleaning chemical I can use to clean up the circuit board after removing the batteries? After cleaning the circuit boar...
- Wed Feb 06, 2002 8:30 am
- Forum: General Discussion
- Topic: MAGNUM 600 SCHEMATIC
- Replies: 2
- Views: 3086
Re: MAGNUM 600 SCHEMATIC
Contact Blob at www.bomarc.org , they have tens of thousands of schematics.<p>Smitty
- Wed Feb 06, 2002 5:41 am
- Forum: General Discussion
- Topic: LM386 Op Amp
- Replies: 2
- Views: 2412
LM386 Op Amp
I'm trying to design a circuit using a surface mount LM386 Op Amp and I have a couple of questions if anyone can help. When I go to order a few of these, I see there are different ratings, 6 Volts, 9 Volts, 12 Volts. Are these voltage ratings the minimum to power the IC or are they the maximum? If t...
- Mon Jan 28, 2002 12:08 pm
- Forum: General Discussion
- Topic: RF Switch
- Replies: 3
- Views: 3121
Re: RF Switch
Hi MrAl, <p>Thanks for your reply. One second would be too long. I believe 1/2 second would be okay but maybe even less.<p>Smitty
- Mon Jan 28, 2002 11:14 am
- Forum: General Discussion
- Topic: RF Switch
- Replies: 3
- Views: 3121
RF Switch
I purchased an RF Switch similar to the type sold at Radio Shack where you use a keychain transmitter with an ON button and a separate OFF button. The receiver module plugs into an electrical outlet and then you plug your appliance into the receiver. I would like to modify the transmitter or receive...
- Fri Jan 25, 2002 4:30 pm
- Forum: General Discussion
- Topic: IR remote control
- Replies: 16
- Views: 10096
Re: IR remote control
Here is a very good IR link http://www.epanorama.net/links/irremote.html ; I always use the Epanorama links for research.<p>Smitty
- Sat Jan 19, 2002 10:41 am
- Forum: General Discussion
- Topic: Looking for schematics of a Scientific Atlanta Cable Box
- Replies: 1
- Views: 2727
Re: Looking for schematics of a Scientific Atlanta Cable Box
Try www.bomarc.org , they have just about everything.
- Fri Jan 18, 2002 11:10 am
- Forum: General Discussion
- Topic: Strobes and Sparks---TJ Byers
- Replies: 1
- Views: 2135
Strobes and Sparks---TJ Byers
I'm experimenting with disposable cameras and saw the Q & A article in the Dec. 2001 issue. How can I modify a disposable camera unit to produce streaming sparks between 2 probes? Any suggestions or a circuit is appreciated.
- Fri Jan 18, 2002 7:58 am
- Forum: General Discussion
- Topic: TV Flyback Transformers
- Replies: 7
- Views: 5280
TV Flyback Transformers
I have a flyback transformer I purchased surplus, It has 10 pins. I want to experiment with high voltage experiments using a DC input. How can I determine which pin produces which voltage and also how can I measure the voltage when my multimeter only goes as high as 1000 volts? Any help is appreciat...