Search found 14 matches
- Wed Mar 01, 2017 10:11 am
- Forum: General Discussion
- Topic: How Many Cycles?
- Replies: 10
- Views: 5665
Re: How Many Cycles?
Len, I can guess where you're headed with this project now, but it beats doing real work :grin: so I'll post version 3 of your data table and crunch some numbers to see where it goes. ver. 3 Tank 0.27 Cu Ft / 2200 PSI Tank Data Temperature (STP): 70 deg F (at Standard Temperature & Pressure) Pro...
- Tue Feb 28, 2017 8:01 am
- Forum: General Discussion
- Topic: How Many Cycles?
- Replies: 10
- Views: 5665
Re: How Many Cycles?
Len, Sorry, I didn't recalculate anything on the tank. Wait! 40 cu.ft.? That can't be one-hand carry! Maybe 40 cu.ft. of "standard pressure" N? I admit, I was thinking 40 gal. (probably also wrong) and picturing the "chest-high" industrial tanks (similar to dad's Oxygen tank on a...
- Tue Feb 28, 2017 6:22 am
- Forum: General Discussion
- Topic: How Many Cycles?
- Replies: 10
- Views: 5665
Re: How Many Cycles?
Len, First, I calculated my previous "SWAG" by comparing 40 cu.in. per cycle fed from 40 cu.ft. tank. So, a simple ratio of inch to foot, cubed, gives 1728 cycles from one full tank @120 psi drained to zero (theoretical). Seat-of-the-pants engineering and the pressure differential makes me...
- Sat Feb 25, 2017 11:54 am
- Forum: General Discussion
- Topic: How Many Cycles?
- Replies: 10
- Views: 5665
Re: How Many Cycles?
I'm not an engineer, but this seems workable. First, how many cu.ft. at 120 psi equal 40 cu.ft. @2200 psi? (I don't know, but Nitrogen is quite compressible) Subtract 40 from that (tank still full of N @120 psi), then divide by 40 cu.in. and you should have a fairly close estimate. My quick SWAG is ...
- Fri Dec 09, 2016 6:41 am
- Forum: General Discussion
- Topic: Remote Control Light Dimmer
- Replies: 4
- Views: 7745
Re: Remote Control Light Dimmer
Thanks, Engineer. I don't think I'd seen UPB before. Yes, initial research suggests it's based on the same basic ideas as X10, but much more robust. Almost as if UPB came from an effort to "fix" problems with X10 :smile: . I recall looking through some X10 forums several months ago. A comm...
- Mon Dec 05, 2016 3:32 am
- Forum: General Discussion
- Topic: Remote Control Light Dimmer
- Replies: 4
- Views: 7745
Remote Control Light Dimmer
Here's a project that's been bouncing around my head for years (like a BB in a boxcar); remote control of a few theatre lights. Background; Many years ago, I was involved with community theatre (read "LOW budget"), often working with lighting. This is different than "special effects&q...
- Fri Nov 04, 2016 8:36 am
- Forum: General Discussion
- Topic: Junk or Repair CD Player?
- Replies: 10
- Views: 5496
Re: Junk or Repair CD Player?
I can sympathize on the white noise. Back when I spent several years on the "graveyard shift", I bought a clock/radio/noise generator (from the DAK catalog?) to help sleep during daylight. I have no idea what's currently available. Quick and cheap, you could try a small sheet of foam rubbe...
- Wed Aug 24, 2016 7:16 am
- Forum: General Discussion
- Topic: CID logger
- Replies: 8
- Views: 7489
Re: CID logger
Welcome back. Sorry I don't have any brilliant ideas. I suppose some CID units could be hackable to read the memory chip(s) and pass the data to a PC, but that would be more project than you want. I'd be interested in the device you describe. I've been manually logging my caller ID's to a spreadshee...
- Mon Mar 14, 2016 10:35 am
- Forum: General Discussion
- Topic: Call for a hack idea!
- Replies: 4
- Views: 3021
Re: Call for a hack idea!
Hi, Len, Yes, you followed my "quick fix" correctly. I'm guessing the Chinese didn't invent anything expensive. Also guessing there's a "black box" control behind the curtain. Who knows, maybe they got a deal on a shipload of the "black box" for my '80's JD lawn tractor...
- Sat Mar 12, 2016 11:31 am
- Forum: General Discussion
- Topic: Call for a hack idea!
- Replies: 4
- Views: 3021
Re: Call for a hack idea!
Would a "step start" be good enough? A small-value resistor switched in parallel to the rheostat could give a slow start speed, then open that switch to "jump" to the speed preset by the rheostat. That would still need the "on-off" switch, needing three actions to resta...
- Sat Mar 12, 2016 6:04 am
- Forum: General Discussion
- Topic: hot water heater monitor.
- Replies: 23
- Views: 11719
Re: hot water heater monitor.
I stand corrected :( . I must have been thinking of limiting voltage "in the water" with 115V elements. But then you'd have trouble getting enough energy into the water. When I get on the wrong track, I can take it a long way! Got me to wondering; is there another hole in the tank below th...
- Thu Mar 10, 2016 10:41 am
- Forum: General Discussion
- Topic: Thinking Back.
- Replies: 1
- Views: 1874
Re: Thinking Back.
Those headset systems sound like what we had in a community theater (repurposed church building) years ago. It had permanent wiring to strategic outlets (1/4" phone jacks with integral switch - plug in your headset to open the switch and put it "in circuit"). I thought they were all w...
- Thu Mar 10, 2016 9:47 am
- Forum: General Discussion
- Topic: hot water heater monitor.
- Replies: 23
- Views: 11719
Re: hot water heater monitor.
To detect a failed heater element, how about tracking thermostat "ON" time? It's been awhile since I worked on one (I currently have a tankless LP gas water heater), but I believe residential water heaters are effectively wired as two "shared neutral" 115V circuits within the hea...
- Wed Mar 09, 2016 7:09 am
- Forum: General Discussion
- Topic: hot water heater monitor.
- Replies: 23
- Views: 11719
Re: hot water heater monitor.
Long ago and far away, my brother milked 70+/- cows. He had given up replacing the lower heater element in the 80 gallon water heater because it would fail within a few weeks. (He generally kept a replacement on hand, also stocked by the local hardware store) Every month or three, one of us would dr...