Search found 235 matches

by Dimbulb
Tue Sep 27, 2005 8:54 pm
Forum: General Discussion
Topic: RF joystick controller
Replies: 1
Views: 649

Re: RF joystick controller

RC = ( remote control )
there is a pic chip schematic such as:
http://www.rentron.com/ruf-bot.htm<p>The frequencies are assigned by
government regulations for RC.
by Dimbulb
Wed Sep 14, 2005 11:33 am
Forum: General Discussion
Topic: Radio Scan Function
Replies: 4
Views: 961

Re: Radio Scan Function

Reading about phase lock loops. experimenting with a basic plls shows how a stable crystal reference can in effect be stepped.<p>in a different design:<p>a quiet dc voltage lets say from 1 volt to 12 volts from an opamp is supplied to a tuning diode that has the charecteristics of changing capacitan...
by Dimbulb
Thu Aug 04, 2005 12:17 pm
Forum: General Discussion
Topic: Senior Design Project (EE+ME)
Replies: 22
Views: 5563

Re: Senior Design Project (EE+ME)

Necessity, the real mother inventioning I like the informative projects. I see inexpensive PDAs like palm one selling cheap. I see cell phones. .. Something like turn your PDA and cell phone into a wireless modem... This would use the PDA to explore the funny connectors on the bottom of your cell ph...
by Dimbulb
Fri Jul 29, 2005 11:36 am
Forum: General Discussion
Topic: Magnetic core material
Replies: 10
Views: 1723

Re: Magnetic core material

core density of the material and the size is related to that part of the frequency spectrum you would like to resonate.<p>experimenting with a tank circuit in vhf range, the material and size would be found in an Arrl handbook. Defining the specific application is helpful.<p>I have spent time with e...
by Dimbulb
Mon Jul 18, 2005 1:16 pm
Forum: General Discussion
Topic: Making hydrogen from water & DC
Replies: 208
Views: 46388

Re: Making hydrogen from water & DC

Academic experts have voiced much and had much influence in the science of H2. All having strong answers but few offer a solution. The fashion and presentation of what is really known about H2 is either incomplete or clouded by someone's conception.<p>Possibly one misconception that impurity clogs a...
by Dimbulb
Thu Jul 14, 2005 11:11 pm
Forum: General Discussion
Topic: Making hydrogen from water & DC
Replies: 208
Views: 46388

Re: Making hydrogen from water & DC

I like that the hydrogen is concidered.
Pure water may not be the one to crack.
I think the long term effect of concidering fueling more hydrocarbons is not as valiant as hydrogen.
by Dimbulb
Thu Jul 14, 2005 11:02 pm
Forum: General Discussion
Topic: Series Zeners
Replies: 8
Views: 1584

Re: Series Zeners

The zener configuration using additional stages
has thermal drifts its numerous configurations. The original plan to adjust 50 volts. 5.000 X 10
by dividing first at a low current. Give us an example of your output to regulate ?
by Dimbulb
Thu Jan 27, 2005 1:32 pm
Forum: General Discussion
Topic: signal generator
Replies: 7
Views: 1756

Re: signal generator

I've built about four different versions based on the max038 and was very happy with the output. I found the larger board 6x6 easier to trouble shoot even though the smaller design was very clever the traces were tight and several attempts with iron-on mask still required high skill level for some t...
by Dimbulb
Wed Jan 26, 2005 1:14 pm
Forum: General Discussion
Topic: signal generator
Replies: 7
Views: 1756

Re: signal generator

Hi I 've built a few signal generators, I think what you are describing ( please help me out)a phase chip (such as ?)for doing like GHz ? the multiplier part gets up there to the range and the other oscillators make up some kind of filter design to clean up the high and low harmonics. Possibly the r...
by Dimbulb
Fri Jan 14, 2005 12:52 pm
Forum: General Discussion
Topic: PRECISION reference voltage
Replies: 4
Views: 1240

Re: PRECISION reference voltage

I hesitate to answer this one as I am sure there will be better answers. When I calibrate something I want a thermally stable reference that yields ten times better resolution so at least that part of the instrument is reliable. Possibly the end use makes the last digit more or less significant. I l...
by Dimbulb
Mon Jun 28, 2004 8:59 pm
Forum: General Discussion
Topic: High-quality resistors
Replies: 14
Views: 2359

Re: High-quality resistors

I purchased some nichrome wire samples with various ohms per foot. I used a length times ten approach to try to get an extra digit.( I'm not sure this is helpful) For example ten feet measures N ohms so one foot should be 1/10 N ohms. The temperature a this point was a big factor. A larger diameter ...
by Dimbulb
Fri May 07, 2004 10:22 pm
Forum: General Discussion
Topic: how to check a tank circuit
Replies: 8
Views: 1457

Re: how to check a tank circuit

Hello I think you have a fair question. On my television which is USA variety that uses an external antenna.<p>On channel 8 you should be able to adjust it to 180 Mhz. When the transmitter is on and coupled to the antenna input or using an antenna to antenna coupling you might say the picture should...
by Dimbulb
Mon Apr 19, 2004 6:10 pm
Forum: General Discussion
Topic: Ways to do things
Replies: 5
Views: 1034

Re: Ways to do things

You work on machine shop on a large boat, bunch of people exchange ideas for improvement. The experimental machinist has a feel for making something.<p>In industry the engineer works with different technical people and after the product is made the engineer stays and the technical people go.<p>The m...
by Dimbulb
Mon Apr 05, 2004 9:38 pm
Forum: General Discussion
Topic: Audio Frequency Counter Recommendation
Replies: 14
Views: 3181

Re: Audio Frequency Counter Recommendation

Thanks guys I'm having a good laugh at myself tonight. <p>Long ago someone said " YOU DIM BULB! "<p>So.
by Dimbulb
Sun Apr 04, 2004 6:43 pm
Forum: General Discussion
Topic: Audio Frequency Counter Recommendation
Replies: 14
Views: 3181

Re: Audio Frequency Counter Recommendation

Dimbulb is way out there today.<p>An interesting question and there are relativly few applications for people who really want to know precisely about audio frequency.<p>In studying bats a simple method of divider chip gave meaning to the ultrasonic by converting to audio. I like this because the var...