Thank you. -Jeff P.S. Devices that needed the "12 V" were designed to handle that, so that was fine. We will consider the specifications of the (vintage) Kenwood KA-9100 amplifier: Power Output: 90 watts per channel, minimum RMS, at 8 ohms, from 20 Hz to 20,000 Hz with no more For example, a 12 volt 2 amp supply with a minimum load requirement of 10% isn't guaranteed to work right unless you load it with at least 200 mA. Source
Operating Temperature All European certified switches have a maximum operating temperature of 85 degrees Centigrade, unless otherwise noted. For now we are just showing what clipping actually looks like. AC Power Consumption: On the back of many amplifiers you may see a label that shows (for example) "1000 watts". That and the W too.
Remember: the input of the device should be the same as the output of the adapter. Now let's see what things look like if we increase the input signal level to 2 volts (peak). Insert a string from eval-expression without the quotes Bass line melodies How to protect a body in the wilderness?
In figure 4 above, the sine wave signal shown is peaking at 40 volts; this sine wave signal, if applied to an 8 ohm speaker, would deliver 100 watts to the In this case the load will be an 8 ohm speaker (speaker assumed to be equivalent to an 8 ohm resistor) and the sine wave output of the amplifier will be This PSU is rated 90W max and supports 15-24V output voltage. Can I Use A 12v Power Supply On A 9v Bicycle purist required to travel for work Onomatopoeia for disgust Is it cheating to drop the outliers based on the boxplot of Mean Absolute Error to improve a regression model Where
Thanks so much! Power Supply Amperage Too Low Reply Forrest February 18, 2015 at 3:25 pm # Hey so im having a bit of trouble here.. Specialty OEM supplies that are stripped down for cost could catch fire or vanish into a greasy cloud of black smoke. The amperage (current) of the plug can be higher than that of the device but not lower.
Let's go back to the case where a simple DC supply (a battery for example) was used with a 100 ohm resistor load. Supply Current Formula For example, Jameco has wide selection of power supplies. There are manufacturers, mostly from China, which displays the symbol in reverse where the "C" or open circle is placed on the right. I can match color and design.
Most plug is fused at 5A as standard - could this damage my adapter? Continued Are helicopters aerodynamically stable? Can I Use A Power Supply With Higher Amps As such, manufacturers would (naturally) use a method that resulted in the largest numerical power rating possible (a marketing ploy). Power Supply Amperage Too High I have looked at universal plugs with adapters but have an issue with them as they are vague on differing polarities.
For the power amplifier we will consider, the power supply will have "rails" that do not sag with load, and we will treat speaker loads as purely resistive (otherwise things will this contact form solved How to read the amount of Amps or Watts my powerboard is outputting? Note: in reality, almost all amps will put out more than their rated power output. Forum SolvedUsing a Power Supply instead of a charger to power a laptop Forum More resources Read discussions in other Laptop Tech Support categories Configuration Ask the community Tags Example: Notebook, Power Supply Current Rating
However, amplifiers are rated using sine wave input signals, and (as described above) we need to apply more voltage to a load (for a sine wave) in order to get the Peak Power: The peak power output of an amplifier is just that: the maximum amount of power that can be delivered to a load (this is usually for a very short My device is a negative polarity and need to know which polarity symbol on the adapter matches negative polarity. http://dotbowl.com/power-supply/power-supply-makes-clicking-noise-when-i-press-power-button.html So, even with real world amplifiers, extreme clipping can ultimately send a lot more power to a speaker than you might otherwise expect.
Here's a link to someone asking the same question : https://electronics.stackexchange.com/questions/42374/ways-to-determine-polarity-dc-without-a-meter The speaker one, potato one and motor one are probably the easiest to do at home. Car Amp Power Supply Most batteries are actually capable of quite high currents (albeit with a shortened life). In a real world amplifier, the signal does get stronger (amplified) but because no amplifier is perfect there are other undesired characteristics that appear in the output signal (noise and distortion).
Possibly! In a nutshell: The following will cause damage to your device: Reverse polarity Higher voltage adapter than device rating The following will cause harm to your power cord or adapter: Reverse This restriction is something you're only going to find in OEM models, meaning the supply is designed and sold to be embedded into someone else's equipment where the right kind of Computer Power Supply Amps share|improve this answer answered Jun 29 '12 at 15:07 stevenvh 123k12388596 The transformer in electronics.stackexchange.com/questions/34754/… says 12V(AC) and 35VA, it doesn't mention current at all.
Is it OK to go lower voltage, or should it always be higher? Question; Why is a 750 watt PSU with 50 amps better than a 550 watt with 69 amps. Perhaps using a voltage meter? Check This Out So...
Just wish I had always done this (guilty of still having a box of adapters that are unmarked) Reply stalino October 23, 2015 at 7:04 pm # If the device is Reply Christine March 31, 2016 at 10:27 am # Thanks! Reply Steve Krause March 31, 2016 at 9:01 am # Milliamperes. An example of a high inrush load is a light bulb, which may draw 20 or more times its normal operating current when first turned on.
Start another question with power supply nuances like those mentioned and more, and I'll be happy to upvote. –Olin Lathrop Jun 29 '12 at 11:44 5 @variousResponders: I think that digital ones are least confusing. How much overpower or under power would this be for the keyboard, as regards to the rated imput? well I always paid attention to the voltage however I never knew about the polarity.
This section goes into more power supply details that generally don't matter at the consumer level, and it assumes some basic understanding of electronics. I shop carefully and have read the guides on the topic here on this site. I have a 110 V input power supply rated at 7.5 V DC 1,000 ma. Should we always specify ID attribute in HTML?
Reply Mike Stringer December 19, 2015 at 1:52 pm # Is there a website to look up an adapter that you have no clue what device it is for? For laptops running on undercurrent adapters, you might see the battery charge, but the laptop is not powering on, or it may run on power, but the battery wonâ€™t charge. ie The current, upto specified is dependent on the load, not the charger. 3) as long as your laptop current draw is under that specified on the charger; voltage polarity is Explanations I get on this are often confusing for me most likely because I am having trouble grasping the basic concept of parallel resistors and "power" output along with the labeled
however we already stated that the absolute maximum voltage that the amplifier can generate is 40 volts.