Search found 341 matches

by Ron H
Sun Nov 17, 2002 6:54 pm
Forum: General Discussion
Topic: Video multiplexer
Replies: 2
Views: 1031

Re: Video multiplexer

Unless you want to build or buy a synchronizer (you don't), the two cameras will need to be sync'ed horizontally and vertically before you display them on a split screen. That means that both need to be locked to or driven by a common reference signal, or one has to be locked to the other. If you ca...
by Ron H
Sat Nov 16, 2002 8:42 pm
Forum: General Discussion
Topic: light sensitive resistor detector circuit
Replies: 21
Views: 5866

Re: light sensitive resistor detector circuit

Dean, it's kinda late here. I should be going to bed now, so my thinking may be even fuzzier than usual. Could you explain how the nite lite scheme works? It seems to me that when both 60w bulbs are good, the nite lite has a little more than half the line voltage across it, and glows dimly (maybe). ...
by Ron H
Wed Nov 13, 2002 7:38 pm
Forum: Robotics
Topic: 0 1 to -1 0 1
Replies: 15
Views: 7020

Re: 0 1 to -1 0 1

At the risk of being called a nitpicker...<p>Trinary (ternary seems to be the preferred term) numbers are base 3 numbers, not base four. Or did you mean that with 2 wires, you can potentially have a base four number?<p>A Google search for "ternary arithmetic" and "trinary arithmetic" yields some int...
by Ron H
Mon Nov 11, 2002 6:23 pm
Forum: General Discussion
Topic: Collector vs Emitter
Replies: 8
Views: 1977

Re: Collector vs Emitter

Billdar, you got these backwards:<p>"They are also amplifying different quantities. common collector amplifies voltage whereas common emitter amplifies current."<p>Common collector is an emitter follower, and has current gain, but the voltage gain is slightly less than one. Common emitter is so call...
by Ron H
Fri Nov 08, 2002 4:00 pm
Forum: General Discussion
Topic: light sensitive resistor detector circuit
Replies: 21
Views: 5866

Re: light sensitive resistor detector circuit

Two more cents...<p>Some of these ideas are good. I especially like Al's current transformer and Miguel's light pipe.<p>Regardless of what sort of failure sensor he uses, it seems to me that heater reliability is a problem. I would much rather change a light bulb under a house at my leisure, in the ...
by Ron H
Fri Nov 08, 2002 9:17 am
Forum: General Discussion
Topic: light sensitive resistor detector circuit
Replies: 21
Views: 5866

Re: light sensitive resistor detector circuit

I have a few alternatives.<p>1. Put two 60 watt bulbs in series. The combination will probably dissipate about 40 watts, and they will last a LONG time.<p>2. Use a 60 watt bulb with a series diode like a 1N4004. This will also dissipate about 40 watts, and will last a long time.<p>3. Buy a 100 watt ...
by Ron H
Wed Nov 06, 2002 6:53 pm
Forum: General Discussion
Topic: Stud Detector Schematics??
Replies: 2
Views: 855

Re: Stud Detector Schematics??

A Google search led me to a patent. Go to http://www.uspto.gov and search for patent number 4099118. If you can't see images, click on "help" and follow the instructions to install a free image viewer. If you have some electronics savvy, you may be able to build one from the description and schemati...
by Ron H
Sun Oct 27, 2002 6:20 pm
Forum: General Discussion
Topic: Repalcement for SGC5282/SGC5283 transitors
Replies: 5
Views: 4610

Re: Repalcement for SGC5282/SGC5283 transitors

Rogerio, can you post a URL to a schematic? I found one for IT-1121, and it has those same transistors in it. We might be able to suggest a substitute if you can show a schematic.<p>Ron
by Ron H
Sat Oct 19, 2002 6:54 pm
Forum: General Discussion
Topic: capacitor types
Replies: 19
Views: 6958

Re: capacitor types

Bodgy, mayhaps you have a leaky heart valve? The stress of worrying about this condition could have implanted the term in your mind. :) <p>Ron
by Ron H
Sat Oct 05, 2002 6:48 am
Forum: General Discussion
Topic: diode
Replies: 19
Views: 4570

Re: diode

Voltage doublers are rectifiers. The output is a DC voltage. I've never seen one used on RF. It takes several volts of AC for a voltage doubler to be effective, because two diode drops (about 1.4v, in the case of silicon) are lost in the doubling process. So, if your input is a waveform that is 10 v...
by Ron H
Tue Sep 24, 2002 7:54 am
Forum: General Discussion
Topic: diode
Replies: 19
Views: 4570

Re: diode

by Ron H
Mon Sep 16, 2002 8:46 am
Forum: Robotics
Topic: Just currious...
Replies: 20
Views: 9374

Re: Just currious...

Dean, if you plan on traveling to Europe you'll want to have a wide-range genlock installed so that you can lock to 50 Hz, as well as 59.94 Hz.<p>Ron
by Ron H
Fri Sep 13, 2002 10:02 am
Forum: General Discussion
Topic: Switch debouncing
Replies: 9
Views: 2324

Re: Switch debouncing

Well, the momentary short only lasts for the sum of the propagation delays of the two inverters, and then the output assumes the state of the switch. I can't think of a logic family where this would be a problem.<p>Ron
by Ron H
Wed Sep 11, 2002 11:56 am
Forum: General Discussion
Topic: Basic Inductor Question
Replies: 17
Views: 4913

Re: Basic Inductor Question

Dean, I just now clicked on the URL I posted. Works for me.<p>Ron
by Ron H
Wed Sep 11, 2002 6:35 am
Forum: General Discussion
Topic: Switch debouncing
Replies: 9
Views: 2324

Re: Switch debouncing

Al:
Why would you need pullup resistors, unless you were using open drain (or collector) inverters?<p>Ron