- HOOKING UP AMP GAUGE ? - 10 Updates
- "Floating Ground" - What do they mean? - 2 Updates
- How to transfer files from phone to computer? - 2 Updates
| avagadro7@gmail.com: Apr 23 10:44AM -0700 I have zero knowledge of shunts. Maybe this evening. I see the recommendation has company: https://powerwerx.com/blue-sea-1732-oled-panel-dc-ammeter rated at 100 amp shunt. If I add an external 100 amp shunt to the internal shunt what does the meter read ? what is a shunt doing to the flow of electricity back to charging the battery ? |
| amdx <nojunk@knology.net>: Apr 23 03:23PM -0500 > https://powerwerx.com/blue-sea-1732-oled-panel-dc-ammeter > rated at 100 amp shunt. If I add an external 100 amp shunt to the internal shunt what does the meter read ? > what is a shunt doing to the flow of electricity back to charging the battery ? The shunt is just a low ohm resistor. The ones I posted develop 50mV at 200amps. Doing the math 0.05V / 200 amps = 0.00025 ohms. So a very low ohm resistor. Say you had 100 amps flowing thru the shunt. What would be the voltage across it? 100amps x 0.00025 ohms = 0.025 Volts or 25 millivolts. The meter is a 50 millivolt meter. If you connect the meter across the shunt, since the shunt has 25mV from end to end the meter will read 1/2 scale or 100 amps as the scale is marked. The 0.00025 ohm resistor has no effect on the current flow. 15 inches of your large gauge wire #2, is equal to the shunt resistance. The fuses you see are important because if one of your wires going to the meter shorts, it will burn up the small gauge wires. Are we there yet? The 50 mV meter simple measures the voltage drop across the shunt. The voltage drop across the shunt varies depending on the current thru the shunt. Mikek --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
| Sjouke Burry <burrynulnulfour@ppllaanneett.nnll>: Apr 24 12:34AM +0200 > https://powerwerx.com/blue-sea-1732-oled-panel-dc-ammeter > rated at 100 amp shunt. If I add an external 100 amp shunt to the internal shunt what does the meter read ? > what is a shunt doing to the flow of electricity back to charging the battery ? why should you add a second resistor? Just read the voltage across the the one already there. You cannot disturb anything by adding your voltage meter to it. |
| amdx <nojunk@knology.net>: Apr 23 05:56PM -0500 On 4/23/2017 5:34 PM, Sjouke Burry wrote: > why should you add a second resistor? > Just read the voltage across the the one already there. > You cannot disturb anything by adding your voltage meter to it. What resistor is already there? What are you looking at? Mikek --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
| mike <ham789@netzero.net>: Apr 23 04:23PM -0700 On 4/21/2017 2:56 PM, Bennett wrote: > and hook it up in series with the alternator, i.e., in between the > alternator and the heavy wire which presently comes from the alternator. > If the needle goes in the wrong direction, just reverse the wiring. Might want to read the whole listing, to wit: Note: need a 75mV shunt(Here Not Included) so that you can successfully use this Analog Ammeter. |
| mike <ham789@netzero.net>: Apr 23 04:45PM -0700 > https://powerwerx.com/blue-sea-1732-oled-panel-dc-ammeter > rated at 100 amp shunt. If I add an external 100 amp shunt to the internal shunt what does the meter read ? > what is a shunt doing to the flow of electricity back to charging the battery ? Problem is that you can't do it. The external 100A shunt resistor is a 4-terminal Kelvin connection. You'd have to jump thru some hoops to get the parallel resistance calibrated, and then it would be relatively unstable over time. Get a 200A 4-terminal shunt resistor and a meter that goes with it. |
| mike <ham789@netzero.net>: Apr 23 04:46PM -0700 > Not full. A sampling device connected to an auto amp gauge. For example, the gauge may read 10 amps on a full sweep. Is this too much for outside the dash ? How is this done if it is done on a Kenworth ? > The alt is 200 amps above 65 mph. > There are TSD factors using stereo 40 amp fuse, lights @ 30 amps, vehicle OP amps @ 75 ... where quantifying the load vs miles to go vs a positive battery charge is useful. Better than. 'geee whiz the lights are yellowing' ... as too late n that is 3 hours with no aux load to reach white light again? Not clear what you're trying to accomplish. You will be adding at least two additional failure points in the system. Why is the alternator current important? If the battery is charging, you're good to go. The thing you care about is the battery voltage. If the alternator output is sufficient, you will be able to see it on a voltmeter. That can be done trivially... http://www.ebay.com/itm/New-LCD-Cigarette-Lighter-Voltage-Digital-Panel-Meter-Volt-Voltmeter-Monitor-DT/252487060054?_trksid=p2045573.c100506.m3226&_trkparms=aid%3D555014%26algo%3DPL.DEFAULT%26ao%3D1%26asc%3D41375%26meid%3Dc1ba847ee8d94551a0b7a892e29b5c34%26pid%3D100506%26rk%3D1%26rkt%3D1%26 |
| ohger1s@gmail.com: Apr 23 04:57PM -0700 On Sunday, April 23, 2017 at 7:47:35 PM UTC-4, mike wrote: > it on a voltmeter. > That can be done trivially... > http://www.ebay.com/itm/New-LCD-Cigarette-Lighter-Voltage-Digital-Panel-Meter-Volt-Voltmeter-Monitor-DT/252487060054?_trksid=p2045573.c100506.m3226&_trkparms=aid%3D555014%26algo%3DPL.DEFAULT%26ao%3D1%26asc%3D41375%26meid%3Dc1ba847ee8d94551a0b7a892e29b5c34%26pid%3D100506%26rk%3D1%26rkt%3D1%26 In the old days, cars had ammeters. The problem is that it was difficult to discern if the needle was slightly left or right of center. Today cars have voltmeters which tells more in my opinion. In a 12V system, anything more than 12.6 indicates a positive charge condition. I had a condition recently where my alternator's internal regulator failed and it was pumping 17V into the car. The ammeter would not have shown this quite as clearly. |
| Sjouke Burry <burrynulnulfour@ppllaanneett.nnll>: Apr 24 02:13PM +0200 On 24.04.17 0:56, amdx wrote: > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus The internal shunt. |
| amdx <nojunk@knology.net>: Apr 24 09:47AM -0500 On 4/24/2017 7:13 AM, Sjouke Burry wrote: >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus > The internal shunt. OK, you're looking at this, https://powerwerx.com/blue-sea-1732-oled-panel-dc-ammeter not the two options I posted. Mikek --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
| oldschool@tubes.com: Apr 24 05:37AM -0400 On Sat, 22 Apr 2017 18:56:51 -0700, Jeff Liebermann <jeffl@cruzio.com> wrote: >need to have a scope with an A-B (that's channel A minus channel B) >input. Connect one probe each from each scope channel to each speaker >lead. Connect both scope ground leads to ground. You're right. First off, it has a power transformer. Secondly it is an amp made to be bridged. After reading the user manual a second time, I determined that this floating ground is only needed in Bridge mode. I have never had an amp that was bridgable (that I know of anyhow). I dont think this is possible with the old tube amps, but I could be wrong. This amp is a solid state, with power transistors (not chips for the output). 16 power transistors to be exact. Although I like tube amps, I could not pass this amp up for the price he wanted. It's rated at 300W per channel using 4ohm speaker load, or 200W per channel using 8 ohm speakers. Or it's brigable to be a 600W mono amp. I'm gonna have fun with this thing.... It's a Altec Lansing 9444A power amp. It appears it was made around 1988 to 1990. And Altec Lansing is top of the line equipment. This is a commercial amp, with balanced XLR inputs, so I will have to buy or make some adaptors so I can connect 1/4" or RCA jacks to it for home use. But I know that my speakers wont handle that full power either, but I suppose I dont have to run it wide open either.... |
| Phil Allison <pallison49@gmail.com>: Apr 24 04:22AM -0700 > I have never had an amp that was bridgable (that I know of anyhow). I > dont think this is possible with the old tube amps, but I could be > wrong. ** You are. > It's a Altec Lansing 9444A power amp. It appears it was made around 1988 > to 1990. > And Altec Lansing is top of the line equipment. ** Altec & Lansing are loudspeaker brands. That amp is just some "badge engineered" POS. > buy or make some adaptors so I can connect 1/4" or RCA jacks to it for > home use. But I know that my speakers wont handle that full power > either, but I suppose I dont have to run it wide open either.... ** Be a devil - let the badger loose .... .... Phil |
| Marte Schwarz <marte.schwarz@gmx.de>: Apr 23 09:52PM +0200 Hi George, > doesn't seem to be a way to get my file managers on either one to see > the other, and initiate a transfer. > Can someone tell me how to do this? One of my Windows-tools I don't want to mis under linux: MyPhoneExplorer: http://www.fjsoft.at/de/ OK, iIt's german (like me ;-), but great ;-) I love these people that made wine. Marte |
| oldschool@tubes.com: Apr 24 05:04AM -0400 >doesn't seem to be a way to get my file managers on either one to see >the other, and initiate a transfer. >Can someone tell me how to do this? If you have a flip phone (not a "smartphone), good luck. It dont seem to be possible. I just have a flip phone. If I enable bluetooth, and put a bluetooth adaptor in my XP computer. I can save my contact list to my computer, but not save any pictures or sound files. I took the phone to a "phone store", and offerred to pay them to save soem pictures to a flash drive. They said it's not possible. If however you have a smartphone with a mini SD card inside. Just pull that mini SD card out, stick it into an adaptor that makes it the size of a standard SD card, and plug that into one of them SD card readers that plug into your USB. Then just copy the files to your computer the same way you would copy them from any source. I learned this from a 17 year old neighbor boy. He dont have a computer, but has that phone with lots of music and some videos and photos. He said he learned how to do it from another kid, but since he has no computer, he could not do it. I have all the adaptors, so I told him to bring it over. I connected it to my XP laptop computer and that mini SD card appeared as if it was a flash drive. I copied the whole card to my harddrive, then copied it over to his flash drive, so he had a backup of all his stuff. He told me to keep his music if I wanted it. (which I did), and then I copied some of my music ot his card, and he could play it in his phone when he put his card back in the phone. I think his phone is Android based, but I am not 100% sure of that. (I dont know much about smartphones). |
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