Search found 341 matches

by Ron H
Mon Feb 11, 2002 7:18 am
Forum: General Discussion
Topic: electronic govener for gas engine
Replies: 29
Views: 11551

Re: electronic govener for gas engine

Russ, an XOR is a phase detector. I think he needs a frequency-locked loop, not a PLL. It would be damned difficult (and overkill) to phase-lock a gas engine that has a varying load. If I were to try to do this electronically, I would probably start with some sort of RPM sensor on the magneto or spa...
by Ron H
Thu Feb 07, 2002 7:03 am
Forum: General Discussion
Topic: Video Amplification and/or baluns
Replies: 6
Views: 2048

Re: Video Amplification and/or baluns

Al, there are hundreds of op amps that will handle baseband video. Try these web sites:<p> http://www.national.com/parametric/0,1850,711-c8-0,00.html <p> http://www.linear.com/prod/parametric.html?mode=pft&pft=250&product_family=opamp <p> http://para.maxim-ic.com:80/compare.asp?Fam=Vid_Amp&Tree=Amps...
by Ron H
Wed Feb 06, 2002 6:58 am
Forum: General Discussion
Topic: DSS Dish
Replies: 10
Views: 3097

Re: DSS Dish

Here is the info you need.<p>http://www.echostaruser.org/ekb/70.htm<p>Ron H
by Ron H
Mon Feb 04, 2002 10:35 am
Forum: General Discussion
Topic: DSS Dish
Replies: 10
Views: 3097

Re: DSS Dish

Seems like it would be difficult to know when you have the dish pointed directly at the source, especially with offset feed dishes (of which the Primestar is one example). I found this illuminating article http://www.w1ghz.cx/antbook/chap5.pdf <p>This talks mostly about the 18" RCA dish, but there i...
by Ron H
Fri Feb 01, 2002 10:01 am
Forum: General Discussion
Topic: Source for SA605D mixer/amp
Replies: 1
Views: 1214

Re: Source for SA605D mixer/amp

Arrow has them for $6.59. Go to http://www.arrow.com/ and search for SA605D.<p>I found this by doing a Google search for SA605D. The very first result took me to Philips, where I found a "buy online" box, which took me to Arrow. If you don't use Google or some other good search engine, you are missi...
by Ron H
Wed Jan 23, 2002 7:24 am
Forum: General Discussion
Topic: Low Vsat transistors ?
Replies: 13
Views: 5626

Re: Low Vsat transistors ?

Mr. Al, I hate to be a wet blanket, but are you going to get enough base drive for the current you want? The ZXSC300 base drive current is 1.5ma minimum, 3.6ma maximum. Where are you going to find a transistor with the beta you need? Also, the guaranteed drive voltage is [Vcc-0.3v]. Worst case, you ...
by Ron H
Tue Jan 22, 2002 11:51 am
Forum: General Discussion
Topic: TLC548 ADC question
Replies: 9
Views: 3215

Re: TLC548 ADC question

Matthew, if I am interpreting your ASCII schematic correctly, you are using a DC-DC converter to power the ADC. The noise from this alone could be the source of your jitter. If you are also using this for the reference, it's almost certain to be the cause. These parts draw 3ma max. I would power the...
by Ron H
Wed Jan 09, 2002 5:27 pm
Forum: General Discussion
Topic: ac dimmer
Replies: 12
Views: 4651

Re: ac dimmer

Keep in mind that you can control power delivered to a load using a triac, but you can't truly attenuate the AC line voltage using triacs,while preserving the sinusoidal waveform, without jumping through some big hoops. A triac changes the average voltage delivered to the load by duty cycle modulati...
by Ron H
Wed Dec 19, 2001 3:16 pm
Forum: General Discussion
Topic: Help with simple diode circuit ???
Replies: 13
Views: 5917

Re: Help with simple diode circuit ???

John Albers knows how to post a quote. You there, John?<p>Ron H
by Ron H
Wed Dec 19, 2001 2:22 pm
Forum: General Discussion
Topic: Help with simple diode circuit ???
Replies: 13
Views: 5917

Re: Help with simple diode circuit ???

Well, I clicked on the "" (reply with quote) at the top of John Albers' last post, naively assuming it would place the contents of his post in mine. Obviously, I was wrong.
Regarding images - the FAQs say you can't include files. Is there a way to include an image without including a file?<p>Ron H
by Ron H
Wed Dec 19, 2001 12:14 pm
Forum: General Discussion
Topic: Help with simple diode circuit ???
Replies: 13
Views: 5917

Re: Help with simple diode circuit ???

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by john albers: [QB][/QB]<hr></blockquote><p>If you have the diode V-I curve, you can use a "load line" to determine the diode's operating point for a given supply voltage and series resistor. Simply ...