Search found 149 matches

by bridgen
Thu Jun 16, 2005 12:48 pm
Forum: General Discussion
Topic: electric fence
Replies: 12
Views: 2472

Re: electric fence

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Matt Nuzum: [QB]My first electronics kit was a simple blinking LED that ran off a simple LM3909 (discontinued) chip. I hooked it up to a D cell battery and it was still blinking 2+ years later.<hr>...
by bridgen
Mon Jun 13, 2005 3:12 pm
Forum: General Discussion
Topic: Test Patterns in Computer Form
Replies: 3
Views: 910

Re: Test Patterns in Computer Form

Take a look at the free Monitor Test download here.
by bridgen
Thu Jun 02, 2005 2:56 pm
Forum: General Discussion
Topic: microfich-microfilm of back issues of electronics magazi
Replies: 7
Views: 1714

Re: microfich-microfilm of back issues of electronics magazi

There used to be a place in Benton Harbor, Michigan, which advertised in (I think) QST magazine, amongst others. Can't think of their name.
by bridgen
Wed May 25, 2005 5:31 am
Forum: General Discussion
Topic: Treadmill into potters wheel
Replies: 7
Views: 1549

Re: Treadmill into potters wheel

It's a 24V 2W zener.
by bridgen
Sun May 22, 2005 7:54 am
Forum: General Discussion
Topic: Hex Heverter Relay activation
Replies: 14
Views: 3142

Re: Hex Heverter Relay activation

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by philba: it needs to be high for some period before going low. I've run into this before .... Try it. <hr></blockquote> Ok philba, will do.<p>[ May 22, 2005: Message edited by: David Bridgen ]</p>
by bridgen
Fri May 20, 2005 10:47 pm
Forum: General Discussion
Topic: Sound Power
Replies: 25
Views: 4549

Re: Sound Power

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by ezpcb.com: I have a question, will 120dB untrasonic sound damage human's ears?? <hr></blockquote><p>120dBA for more than a few minutes almost certainly would.<p>[ May 20, 2005: Message edited by: D...
by bridgen
Fri May 20, 2005 11:55 am
Forum: General Discussion
Topic: Hex Heverter Relay activation
Replies: 14
Views: 3142

Re: Hex Heverter Relay activation

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by philba: The trigger voltage needs to be high for at least as long as the output pulse.<hr></blockquote> No it doesn't. It needs only a brief negative-going pulse. <blockquote><font size="1" face="V...
by bridgen
Thu May 19, 2005 9:20 am
Forum: General Discussion
Topic: Hex Heverter Relay activation
Replies: 14
Views: 3142

Re: Hex Heverter Relay activation

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>A single 555 in one shot mode triggered by a short pulse won't work for this because the trigger pulse needs to be as long or longer than the output pulse.<hr></blockquote> No it doesn't, and it can't be longer than th...
by bridgen
Mon May 16, 2005 7:39 pm
Forum: General Discussion
Topic: Add DC bias to sinusoidal signal
Replies: 13
Views: 4464

Re: Add DC bias to sinusoidal signal

What op-amp are you using?
by bridgen
Mon May 09, 2005 11:36 am
Forum: General Discussion
Topic: need transformer source
Replies: 5
Views: 1577

Re: need transformer source

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>If you need isolated windings, you are up the well known creek with out a paddle.<hr></blockquote><p>You can connect in series the secondaries of separate transformers to get whatever voltage you need.
by bridgen
Thu May 05, 2005 2:46 pm
Forum: General Discussion
Topic: Gmail
Replies: 4
Views: 1114

Gmail

I have, in other forums, come across several requests for Gmail invitations.<p>Can anyone explain what the fascination with Gmail is?
by bridgen
Thu Apr 28, 2005 1:38 pm
Forum: General Discussion
Topic: Capacitor Mfg. Logo Help
Replies: 7
Views: 1355

Re: Capacitor Mfg. Logo Help

It's Siemens.
Do a Google Image search for "siemens logo".
by bridgen
Thu Apr 21, 2005 7:34 pm
Forum: General Discussion
Topic: Backup power for PLC
Replies: 5
Views: 1490

Re: Backup power for PLC

This scheme would work.

Image