The ratings tag has no wiki summary.
6
votes
3answers
281 views
Why can't a power supply supply low current?
I've just read this article and don't quite understand how a power supply can't supply such a low current. I was always under the impression a power supply could supply anything up to its rating, but ...
3
votes
2answers
140 views
Vacuum cleaner power rating does not match line voltage and current rating
I have a vacuum cleaner on which is proudly written:
12.0 Amps
1300 W
Assuming a 120 V (RMS) power supply, how would the power consumption of the vacuum cleaner be calculated given the 12.0 ...
2
votes
1answer
51 views
ULN2003A rating
I am confused about what this statement means:
Each channel rated at 500 mA and can withstand peak currents of 600
mA.
Does it mean that the ULN is capable of driving up to 500 mA per channel ...
0
votes
2answers
177 views
LCD rated at max 5.5 V used at 6V
I'm trying to use an LCD (DEM16101) from a uC.
At some point I've connected it's power input to a 6V battery (above its 5.5 V max rating).
I can't initialize it properly so at this point I'm ...
3
votes
2answers
1k views
Selecting the right bridge rectifier
There are a number of schematics I'm trying to interpret that have bridge rectifiers. In the components list, however, they're simply listed as "D1-D4 rectifier unit" without any specific values.
How ...
0
votes
1answer
157 views
Relay contact voltage rating
I was looking through to buy a few relays and found the nominal DC contact voltages (~30v) are much smaller than the nominal AC contact voltages (250v). What is the reason for such a large difference?
...
2
votes
2answers
656 views
What does these switch rating mean?
Current rating: 3A @ 125 VAC, 1A @ 250 VAC
What can I read to understand this ratings better? What exactly does it mean?
They're used to rate this Momentary N.O. Raised Push Button Switch.
1
vote
3answers
664 views
What happens if usage current exceeds DC adapter current rating?
I have a DC adapter 5 V, 350 mA. I'm using this adapter to be fed into a 3.3 V regulator which powers up my bluetooth device and a few LEDs.
My question is: what happens if I source 300 mA from this ...
6
votes
3answers
616 views
Current and Voltage Ratings for Multi-Conductor Connectors
I am currently looking at some multi-conductor connectors that will handle reasonably high currents (approximately 30 A at 24 v). When reading datasheets, I see that the connectors have both a maximum ...
1
vote
5answers
350 views
Relay current ratings
I need to slow-charge a bank of capacitors that power a load which draws up to 150A at 12V, because I don't want to draw a massive amount of current when the battery is connected to the ~20000uF cap ...
2
votes
1answer
344 views
Electrical Characteristic of a piezo buzzer
I stumbled upon this piezo buzzer and I don't know how to interpret its specifications. What's the difference between
Rated Voltage (Vp-p Square Wave): 5Vp-p
and
Operating Voltage: 1 to 20 Vp-p
?
2
votes
2answers
131 views
Controlled Voltage Environments
I was reading the spec for a patch cable (Ponoma B-36-02) and when came across the following:
"Operating Voltage:
Hand-held Testing: 30VAC/60 VDC Max.
Hands free testing in Controlled ...
1
vote
2answers
327 views
What are the tolerances for the maximum current a battery can supply?
After a lot of research and experimentation I have come to learn that the sentence "This is a 1.5V, 2800mAh battery" is entirely a lie.
(i.e., the potential difference between the terminals of a ...
1
vote
3answers
153 views
selecting voltage rate for capacitors
In my project I want to use some ceramic and electrolit caps, I will need the capacitors be at least 10V rated, but what will happen if I use much higher rated caps (just to make sure in case of ...
9
votes
2answers
2k views
Can I swap an electrolytic capacitor with one with a higher voltage?
I wish I knew more about this stuff, but alas I do not. I have a radial lead aluminum electrolytic capacitor (rated 470mF and 25v) that died on me. Can I swap it out with one rated at 35V, or do I ...
2
votes
1answer
177 views
Stepper Motor Supply Voltage
My stepper rating is 0.33A per phase, 23.9Ω phase resistance and 29.8mH inductance/phase.
What voltage should I use to drive this motor so that it provides holding torque around 13.7Ncm (rated ...
2
votes
2answers
83 views
Need help identifing the power rating for this resistor
I have this wire-wound power resistor that appears to be either ceramic or porcelain in construction with a soft brown plastic or vinyl like coating. I want to find out its power rating. My meter ...
7
votes
3answers
390 views
µ in the Middle of a Capacitor Rating
I'm looking at an electrolytic capacitor (and old blue, Philips one used in electronics classes) and am wondering why it is printed with 4ยต7-M.
I tried Googling, figuring that it was a common enough ...
2
votes
2answers
260 views
Should I select components based on peak current, RMS current, or average current?
I am designing a SEPIC supply around an LT3757. The MOSFET will have ~6.5A pulses with a strange ramping pattern (see image), but the RMS current is only 3.38A and the average current is 2.60A. ...
4
votes
2answers
472 views
What does 250V DC + AC peak mean?
My oscilloscope's inputs are rated "250V DC + AC peak (10 KHz)." Does this mean it would withstand mains voltage (325V peak) or only 250V DC? I have no plans on doing this any time soon, I am only ...
5
votes
2answers
195 views
What a weird operating range, 2.97V to 3.63V
I've seen several microcontrollers rated to operate from 2.97V to 3.63V. Others I've seen rated from 3V to 3.6V.
What's with the extra 30mV on either end of the scale? It doesn't seem like it would ...
