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Your right about that sorry.
I need to power devices with a total consumption of 125W for either 4-5 hours(using two battery packs to reach 9-10 hours) or 9-10 hours on one battery pack
I need some kind of battery/power bank to provide 230V for some measurement equipment/laptop etc. that preferable doesnt weigh a ton like a car battery, and can last at least as long as a car battery but preferably longer.
Anyone has some suggestions/experience with solutions to look for?
I think you understood my problem correct.
I know it sounds like abit weird setup. But to simplify it its:
12Vdc->230Vac->48Vdc->sensor system.
On the sensor outputs i see the even harmonics of 50Hz. So i see 100Hz, 200Hz, 300Hz. But not the 50Hz,150Hz,250Hz.
If i analyse the 230Vac output...
The harmonics from a 12Vdc-230Vac modified sinewave inverter, is giving me the odd harmonics. 50Hz,150Hz,250Hz.
If i change this voltage back to DC with a SMPS, is it possible that the rectifier changes the harmonics to the even harmonics of, 100Hz, 200Hz,300Hz?
So this is how the final schematic looks like. I never figured out what was going on with the decoupling capacitor, measuring 48V on the left side, and 7V on the right side. But the problem got solved some how.
Ive put in a voltage follower for impedance matching, because of the 32kOhm at the...
The Zener diodes havent been removed, although they are from the circuit. The 1uF capacitor is also still there. The circuit is build exactly like on the schematic, except for the missing zener, thats in the circuit but not 2nd schematic.
To block the 48Vdc phantom power do i need another value...
The 3V supply for the accelerometer is working just fine. If i dont connect the Accelerometer X_output to the XLR pin 2, but just measure the voltage with ref to gnd. Then i get the right output from accelerometer. From 1.45V to 1.55V when i turn the accelerometer from -1G to +1G.
If i connect...
I meant pin 3,5,6,7 called COM(common). In datasheet they propose connecting a decoupling from Vs to COM(connected to GND). But can i do this with just one out of the 4 COM pins, and leave the rest of them hanging? Or should i connect all 4 COM pins to GND?
Last question before this is hitting the PCB. All Common pins on the accelerometer, what to do with those?
I only need to connect 1 to ground as they propose in the datasheet? And then leave the rest hanging, or what do to?
Where can i find a good library with SMD components for eagle?
Just basics like SMD resistors and capacitors?
Or is the only way to draw the component your self in eagle.... There must be someone before me who just needs the basic size SMD components like 1206 package?
My output pins on accelerometer has maximumratings of Vs + 0.3V. So that would be 3.3V
Output from accelerometer is Vs/2 + 57mV*+-16g = 1.5V +- 1V.
Any better ways of protecting against overvoltage than the three zenerdiodes i have added here?
This is what i figured out so far.
R1 & R2 is 6.8k resistors.
Followed by 3V zener regulatorcircuit.
I dont have the Motu Pre 8 yet, so im not able to test if this would work. Anyone can see any problems in this circuit?
Help is much appreciated.
Im not really sure i understand Phantom power fully. How do i connect my unbalanced accelerometer output to the balanced XLR?
https://en.wikipedia.org/wiki/File:Phantom_power.svg
From this link it looks like Line In is 3.5V peak-to-peak
http://www.covingtoninnovations.com/audio/digitizing/index.html#levels
My accelerometer has a DC offset of Vs/2, and a sensitivity of 57mV/g. This means a DC offset on 1.5V and approximately +- 1V since is +-16g accelerometer.
This...
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