Search found 268 matches
- Mon Aug 28, 2006 2:42 am
- Forum: General Discussion
- Topic: basic capacitor question?
- Replies: 25
- Views: 12201
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...
- Sun Aug 20, 2006 9:55 am
- Forum: General Discussion
- Topic: Battery Charged Indicator........
- Replies: 24
- Views: 15482
battery charging
Sorry Guys ! - In the third line after 'bettery' it should say 'charger' i.e the battery charger was crude, not the battery.
- Sun Aug 20, 2006 9:47 am
- Forum: General Discussion
- Topic: Battery Charged Indicator........
- Replies: 24
- Views: 15482
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...
- Sun Aug 06, 2006 6:08 am
- Forum: General Discussion
- Topic: Building your own CPU from TTL chips
- Replies: 42
- Views: 48957
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...
- Sat Aug 05, 2006 9:17 pm
- Forum: General Discussion
- Topic: Building your own CPU from TTL chips
- Replies: 42
- Views: 48957
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...
- Wed Aug 02, 2006 2:04 pm
- Forum: General Discussion
- Topic: TV Offer Spam and Dell
- Replies: 2
- Views: 3013
- Mon Jul 31, 2006 12:39 pm
- Forum: General Discussion
- Topic: TV Offer Spam and Dell
- Replies: 2
- Views: 3013
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...
- Fri Jul 28, 2006 3:06 pm
- Forum: General Discussion
- Topic: Best Bang For The Buck Challenge
- Replies: 9
- Views: 5797
- Fri Jul 28, 2006 10:28 am
- Forum: General Discussion
- Topic: Electric Cars
- Replies: 54
- Views: 30322
- Wed Jul 12, 2006 3:13 pm
- Forum: General Discussion
- Topic: variable pot with a fine trimmer
- Replies: 23
- Views: 10400
- Wed Jul 12, 2006 1:46 pm
- Forum: General Discussion
- Topic: variable pot with a fine trimmer
- Replies: 23
- Views: 10400
- Fri Jul 07, 2006 1:12 pm
- Forum: General Discussion
- Topic: Ideas for battery powered heater wanted.
- Replies: 28
- Views: 12518
- Wed Jul 05, 2006 4:17 pm
- Forum: General Discussion
- Topic: Ideas for battery powered heater wanted.
- Replies: 28
- Views: 12518
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 &quo...
- Tue Jul 04, 2006 11:22 am
- Forum: General Discussion
- Topic: Ideas for battery powered heater wanted.
- Replies: 28
- Views: 12518
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...
- Sat Jul 01, 2006 10:30 am
- Forum: General Discussion
- Topic: Cheap Walkie-Talkies for General Instrumentation & Contr
- Replies: 10
- Views: 5475
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 !...