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13.75V sounds really low for an alternator unless you made the measurement at idle. Usually they run around 14.0 - 14.5V. You might have a loose connection.
In any case, charging any lithium battery should only be done through a proper charger that can babysit the battery and cut off the...
It looks like high voltage DC distribution systems are in use all around the world.
https://en.wikipedia.org/wiki/High-voltage_direct_current
https://en.wikipedia.org/wiki/List_of_HVDC_projects
The list includes multiple systems (most in China) that are running at 800Kv!
Ed
A few brands do use high carrier frequencies for their IR remotes. I've heard that Bang & Olufsen and some Kenwood equipment use 455 KHz. I don't think that there's anything special about air conditioners that would make high frequencies desirable. It seems to be more of a company standard...
You could try feeding the output of a 50 Hz sine wave signal generator into an audio amplifier. Run the output of the amp into a step-up transformer to get to 220VAC. For example, use a transformer that's rated for 220VAC to 12VAC. Then adjust the amplifier volume to get 220VAC under load...
As others have said, routine discharging of a UPS battery doesn't really affect the life of the battery.
Since the battery you show in the picture has removable caps, make sure that you monitor the water level in the cells and add distilled water (NOT TAP WATER!) as necessary. If the charge...
The lamps used in all Rubidium standards are custom-made. There are no replacements for old units other than by disassembling another of the same model. Newer units might be repairable by the manufacturer, but I'd hate to think of what it would cost. If the original lamp isn't broken, you can...
It's just coincidence that you happened to find some papers that used oscillators in the 26 MHz range. You can phase lock any oscillator, not just a crystal oscillator, that has a voltage control input. Your choice of frequency is determined by the input frequency, the desired output...
To rephrase what I think you're saying: You can ping Server A and Server B from any PC, but you can't ping Server A from Server B. Is that correct?
If so, there's nothing in a switched network that could cause your problem. However, you may have firewalls running on one or more of your...
Going from 50 to 60 Hz will have no effect on the output voltage. The current situation is a bit more complicated. The power rating for a transformer is determined by the sum of the core losses and the resistive losses of the coils. Going from 50 to 60 Hz will reduce the core losses but won't...
Two years isn't a very long life for your battery. You might want to measure the float voltage on the UPS to make sure it's correct. Too high or too low a voltage will shorten the battery's life. Most small lead acid batteries have the desired float voltage printed right on the battery.
Ed
I would use the twisted pair for power and keep the shield just for shielding. The twisted pair will help to contain any power supply noise. If you use the shield for power ground, you might radiate more electrical noise either outside the unit or into the signal pairs. Since this sort of...
It looks like 2 or 3 cells have shorted out and then killed the charger. Don't try to change the bad cells - new and old cells don't play nice together. You could look around for any cheap 18V nicd drill battery and take the cells out of the new one and put them into the original case. Watch...
What is the voltage measured across the battery when you're not charging it? It's possible that one or more of the battery's cells has shorted out. That would explain the high current draw when you try to charge it. When the original charger died, was it trying to charge the same battery...
Although oscillators typically do not produce subharmonics, depending on your situation there could be lower frequency issues that require filtering. In particular, power supply harmonics can leak into the output. This can be a real problem for systems that use switching power supplies.
Ed
Zeners certainly do drift with time, but AFAIK there is no way to predict the direction or magnitude of the drift. Voltage references are often spec'd in terms of % drift per 1000 hours, but they don't give a direction. I suggest that you review your design to see if you can increase the...
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