由买买提看人间百态

topics

全部话题 - 话题: 10ohm
(共0页)
d********k
发帖数: 701
1
来自主题: Hardware版 - 向懂电路的同学请教
我一个MX revolution鼠标,充电有问题,有个网站说在充电底座上串联三个10ohm电阻
就可以。我试一下,确实好一些,可是用一会,电阻就开始高温发热。
我买的电阻是1/8 watts,有个youtube录像说他用 1/4 watts,都是10ohm。
请问这时候,电阻功率越大,发热越少吗?
谢谢
D**********s
发帖数: 3139
2
来自主题: HiFi版 - 请推荐耳机+耳放 系统
我不知道你现在用啥前端,不过老的meridian和mark levinson前级输出阻抗也就是
50ohm和10ohm,Vpp在600ohm的时候也可以到10V以上,HD650配这些前级只需要买一根
这个,在瞎花钱之前为啥不先试试自己前端的水呢?
y****o
发帖数: 666
3
来自主题: Apple版 - will iPad charger damage iphone?
首先usb电压 = 5 + - 0.25V这个是标准,别说苹果就算是鸭梨牌的也要遵守
开口电压定死5V,有两个电阻,一个1ohm,一个10ohm,试问这个“但iPhone/iPad充电
器有“主动”预防电路”如何实现对两个电阻5A电流输出?
我不否认电池的充电电路通过信号端电压判断充电器功率,我第一帖里说的很明白:使
用iphone充电器为ipad充电可能会损坏充电器,因为iphone充电器功率不够。我强调的
是使用额定功率5W的充电器给10W的设备供电有安全隐患。这就好比体外射精避孕,大
部分情况安全,可万一有点意外就出事故了
n***r
发帖数: 25
4
youfellow made very good points here. improve chopper frequency to move
signal away from flicker noise and use lockin amplifier to detect signal.
I guess LZ's major problem is: even TIA is saturated, the signal is still
too weak.
If Idc=1A, Iac=1uA, with R=10ohm Vdc=10V, Vac=10uV.
Vac is easily burried in the noise floor. You may use Lock-in Amplifier to
get some signal out, you wont get great SNR.
So the solution is to seperate Idc from Iac before converting into Voltage.
Of course you can't f
n***r
发帖数: 25
5
来自主题: EE版 - 请教模拟电路高手
Let me go over with you again.
;the gain of the amp is 500k/10=50k x, approaching most opamp's open loop
;gain, if not more.
Let's replace the 10 ohm with 0 ohm. Will your inverting amplifier theory
work? will the transimpedance amplifier work? Admit it, you were misled by
the 10ohm resistor then you came up with a wrong AC bandwith analysis.
;at that king of gain, the bandwidth of the opamp is very low, likely <10hz -
;check out the opamp's datasheet.
Wrong! The bandwidth of the Transimpedance
l***g
发帖数: 1035
6
经常见到dsp或者cpld 的 dio 有resistor array 10ohm-50ohm。 记得是和噪声有关。
那位有相关的参考资料么?一般多高速的信号,时钟用的上?
(共0页)