Search found 15 matches

by Smitty
Thu Jan 23, 2003 3:20 am
Forum: General Discussion
Topic: PIR portable alarms
Replies: 5
Views: 1981

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...
by Smitty
Wed Jan 22, 2003 7:25 am
Forum: General Discussion
Topic: PIR portable alarms
Replies: 5
Views: 1981

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...
by Smitty
Mon May 13, 2002 7:32 am
Forum: General Discussion
Topic: GPS Devices To Track Cars
Replies: 8
Views: 2563

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
by Smitty
Sat Mar 23, 2002 11:29 am
Forum: General Discussion
Topic: More Range from a Frequency Counter
Replies: 1
Views: 1368

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...
by Smitty
Sat Mar 23, 2002 11:20 am
Forum: General Discussion
Topic: how to build a 24GHz transmitter?
Replies: 12
Views: 7217

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
by Smitty
Mon Mar 04, 2002 7:38 am
Forum: General Discussion
Topic: Battery Acid Leak on Circuit Board
Replies: 7
Views: 2629

Re: Battery Acid Leak on Circuit Board

Thanks everyone, your suggestions have been very helpful.<p>Smitty
by Smitty
Tue Feb 26, 2002 10:45 am
Forum: General Discussion
Topic: Battery Acid Leak on Circuit Board
Replies: 7
Views: 2629

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...
by Smitty
Wed Feb 06, 2002 8:30 am
Forum: General Discussion
Topic: MAGNUM 600 SCHEMATIC
Replies: 2
Views: 1699

Re: MAGNUM 600 SCHEMATIC

Contact Blob at www.bomarc.org , they have tens of thousands of schematics.<p>Smitty
by Smitty
Wed Feb 06, 2002 5:41 am
Forum: General Discussion
Topic: LM386 Op Amp
Replies: 2
Views: 1263

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...
by Smitty
Mon Jan 28, 2002 12:08 pm
Forum: General Discussion
Topic: RF Switch
Replies: 3
Views: 1557

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
by Smitty
Mon Jan 28, 2002 11:14 am
Forum: General Discussion
Topic: RF Switch
Replies: 3
Views: 1557

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...
by Smitty
Fri Jan 25, 2002 4:30 pm
Forum: General Discussion
Topic: IR remote control
Replies: 16
Views: 5638

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
by Smitty
Fri Jan 18, 2002 11:10 am
Forum: General Discussion
Topic: Strobes and Sparks---TJ Byers
Replies: 1
Views: 1156

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.
by Smitty
Fri Jan 18, 2002 7:58 am
Forum: General Discussion
Topic: TV Flyback Transformers
Replies: 7
Views: 2836

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...