Search found 268 matches

by Will
Mon Aug 28, 2006 2:42 am
Forum: General Discussion
Topic: basic capacitor question?
Replies: 25
Views: 5065

Inductance/Capacitance

I think a fairly good mechanical analogy is a centrifugal compressor going into surge. If you have a long pipe on ther discharge and the flow gets throttled to the point it is close to 'the hump' on the head/flow characteristic then the compressor will probanbly go into surge. For a period the gas i...
by Will
Sun Aug 20, 2006 9:55 am
Forum: General Discussion
Topic: Battery Charged Indicator........
Replies: 24
Views: 5143

battery charging

Sorry Guys ! - In the third line after 'bettery' it should say 'charger' i.e the battery charger was crude, not the battery.
by Will
Sun Aug 20, 2006 9:47 am
Forum: General Discussion
Topic: Battery Charged Indicator........
Replies: 24
Views: 5143

Battery Chargers

Some years ago I made a Battery charger control for the wheelchair of an old lady who lived in the same village. Her wheelchair battery was fairly crude in that it furnished a fairly high open circuit voltage to produce a high charge rate so that the battery could charge quickly when required. The p...
by Will
Sun Aug 06, 2006 6:08 am
Forum: General Discussion
Topic: Building your own CPU from TTL chips
Replies: 42
Views: 20119

Micro-computers

OK - this is my version - I have no way of knowing whether it is less or more accurate than the others - but it is more complete. About 1960/70 three PhDs' Gordon, Moore & Noyce left Fairchild or to go work for Brattain ? They couldn't stand that so they set up their own Co. (Intel) specifically and...
by Will
Sat Aug 05, 2006 9:17 pm
Forum: General Discussion
Topic: Building your own CPU from TTL chips
Replies: 42
Views: 20119

This is a big project - I went through this about twenty years ago - planned it all out but never built it. Just about when I got ready to solder some parts the 6402 cam out so I switched to that. If I were you, in order not to get too depressed through not seeing intermediate results - I would star...
by Will
Wed Aug 02, 2006 2:04 pm
Forum: General Discussion
Topic: TV Offer Spam and Dell
Replies: 2
Views: 1103

Thanks Kim, Guess I won't buy one
by Will
Mon Jul 31, 2006 12:39 pm
Forum: General Discussion
Topic: TV Offer Spam and Dell
Replies: 2
Views: 1103

TV Offer Spam and Dell

Hi all ! (i) I just got a new offer by spam/E mail - For $29.95 I can download some software which will allow me to access 1,000s of TV channels on my computer - without adding any equipment - Is this possible ? didi anyone else see/get it ? It is at www.electrictorch.net/unlimited tv (ii) I just re...
by Will
Fri Jul 28, 2006 3:06 pm
Forum: General Discussion
Topic: Best Bang For The Buck Challenge
Replies: 9
Views: 2640

You c an buy a functional scrolling display in Sams for about $180 - you should look at one !
by Will
Fri Jul 28, 2006 10:28 am
Forum: General Discussion
Topic: Electric Cars
Replies: 54
Views: 13886

jwax - what sort of a meter do you have - mt meter, as with jr's can not distibguish between day and night ?
by Will
Wed Jul 12, 2006 3:13 pm
Forum: General Discussion
Topic: variable pot with a fine trimmer
Replies: 23
Views: 4575

Thanks Mr Al
by Will
Wed Jul 12, 2006 1:46 pm
Forum: General Discussion
Topic: variable pot with a fine trimmer
Replies: 23
Views: 4575

Mr Al,
Where is the free scientific calculator download free from ? Thanks
by Will
Fri Jul 07, 2006 1:12 pm
Forum: General Discussion
Topic: Ideas for battery powered heater wanted.
Replies: 28
Views: 5333

The Wattage was OK Nine Degrees F = 5 Deg C so heat required = 5 *200 = 1000 calories = 4186.8 joules/Watt.seconds = 4186.8/3600 = 1.163 Watt.hour- Hope I got that right !
by Will
Wed Jul 05, 2006 4:17 pm
Forum: General Discussion
Topic: Ideas for battery powered heater wanted.
Replies: 28
Views: 5333

Mr Al, Of course you are right ! - I was doing the calculations on an Excel spreadsheet and I entered the internal resistance of the battery as 276 Ohms and not 2.76. Must be either old age creeping up on me or excessive Independance Day libations. As Robert Burns the famed Scots bard once said " Is...
by Will
Tue Jul 04, 2006 11:22 am
Forum: General Discussion
Topic: Ideas for battery powered heater wanted.
Replies: 28
Views: 5333

This is very interesting but I'm not certain it isn't a little over my head because I get a completely different read of the Panasonic data sheet. On the graph which showed battery life against load resistance it shows voltage curves of 5.4 to 7.2 volts - I don't really understand where these are de...
by Will
Sat Jul 01, 2006 10:30 am
Forum: General Discussion
Topic: Cheap Walkie-Talkies for General Instrumentation & Contr
Replies: 10
Views: 2363

Hi Harrogate, Your idea seems fairly good but, if you were going to use this for process control you would presumably be doing it with some sort of relatively sophisticated computing device (A PC ?) in which case you can buy (Here, but perhaps not in the wilds of Wannee in Bradford - I'm a Geordie !...