258 Threads found on edaboard.com: Flicker
I look at it this way. With no large energy storage (electrolytic capacitors) your LEDs will always be dissipating the instantaneous input power, which will be sinusoidal at twice the line frequency. So you will get high ripple current and possibly visible flicker. You might also have more difficulty dealing with mains transients if it's a simple b
Power Electronics :: 03-29-2017 13:17 :: mtwieg :: Replies: 3 :: Views: 633
flicker noise is a relatively low frequency effect that "upconverts" to the RF region. So if you can lower the flicker noise of the device itself, you will have less clock jitter. Some sort of audio frequency feedback loop to bias your oscialator transistor, keeping fets outside of their voltage range extremes, applying analog feedback either in
RF, Microwave, Antennas and Optics :: 03-12-2017 16:26 :: biff44 :: Replies: 1 :: Views: 422
Thanks, but this flicker is how its supposed to be , because i do not have big capacitor on dc bus because it is pfc'd is led current flicker.
Also, i do not have big secondary electrolytic cap as i dont want wet i suffer the led current ripple long as nobody can see it....but can they see it?
Power Electronics :: 02-18-2017 18:16 :: treez :: Replies: 8 :: Views: 673
In fact the Noise Floor is weird and there isn't any flicker Noise corner or 1/fx drops directly
If you post your simulation setup, we can interpret it better.
RF, Microwave, Antennas and Optics :: 12-09-2016 12:57 :: BigBoss :: Replies: 2 :: Views: 437
As Klaus explained, if you have a fixed threshold there will always be 'flicker' as it is crossed, even if you do averaging first. The averaging takes out variations due to noise and measurement consistency but if the result is still a fixed value, there will be a problem with the exact point it is exceeded. You need to adjust the thresholds (eith
Microcontrollers :: 08-13-2016 12:29 :: betwixt :: Replies: 9 :: Views: 1043
There is a mathematical solution, if you are interested , by computing impedance of LEDs and caps.
Also LEDs would benefit with a diode bridge after the triac to give DC instead of half wave rectified by LEDs to reduce flicker when on.
LIght dimmers often flicker on LED lamps not designed for this and need a small tungsten night light or load
Power Electronics :: 08-05-2016 01:01 :: SunnySkyguy :: Replies: 8 :: Views: 2160
The LM3914 is a linear voltmeter but the LM3915 is better for measuring the logarithmic relationship of loudness with our hearing.
My circuit uses a peak detector and its LEDs do not flicker, they show the exact levels of sounds. With no sound all my LEDs are off. With loud sounds all my LEDs are on at the same brightness. Half levels cause half th
Analog Circuit Design :: 06-03-2016 03:55 :: Audioguru :: Replies: 101 :: Views: 5106
I am trying to simulate the noise of a Schottky diode power detector. Theoretically, the flicker noise should approach zero if there is no dc bias but the simulation results I am getting using ADS are quite the contrary. Any comments and experiences are welcome.
PS: I am attaching the plot of Id and output noise vs the DC bias v
Analog Circuit Design :: 05-19-2016 13:24 :: saad :: Replies: 8 :: Views: 723
Look guys neutral is only at earth potential at the supply transformer. Elsewhere it can be anything, though under normal conditions, its the I X R drop on the out of balance current causing a problem. We used to have a 6V bulb connected from N-E and it would flicker all the time and some times burn out.
Analog Circuit Design :: 05-13-2016 16:30 :: chuckey :: Replies: 8 :: Views: 1592
I want to calculate a simple CS amplifier flicker noise. The parameters for flicker noise calculation are Cox, W , L , freq and Kf. Other flicker noise constant Kf , i had remaining values. What is the value fot Kf ?
Elementary Electronic Questions :: 04-11-2016 04:53 :: phanikiran :: Replies: 1 :: Views: 563
To know the inverter power (magnitude and direction), you'll multiply and voltage and current (instantaneous power) and average the product. Under circumstances, it's sufficient to form sign(P) = sign(V) xor sign (I), needs only two comparators.
The inverter can also "source" or "sink" reactive power, in this case sign (P) will flicker with doub
Professional Hardware and Electronics Design :: 03-06-2016 08:32 :: FvM :: Replies: 9 :: Views: 911
It is normal for a lamp to flicker on and off at double the mains frequency for long fluorescent tube lamps or at around 38kHz for compact fluorescent light bulbs.
You must smooth the on-off fluctuations from the IR detector with a filter.
Analog Circuit Design :: 02-14-2016 16:22 :: Audioguru :: Replies: 9 :: Views: 721
If you operate your inverter with constant load, there won't be any flicker. So apparently you are creating a problem with your approach rather than solving it.
First step to understand the system behavior would be to run a control characteristic without feedback to verify that the duty cycle variation is working correctly. Secondly verify that
Microcontrollers :: 02-04-2016 09:59 :: FvM :: Replies: 15 :: Views: 1511
I would like to know whether Horizontal lines are similarly caused. My LCD tv has horizontal lines that flicker and vibrate vertically as if the tv has lost vertical sync. The pictures and sound will be ok. But this flickering is much less when there is no signal. Only a little when there is the tv logo and a blue screen... Any Ideas?
Service Manuals, Requests, Repair Tips :: 12-27-2015 16:10 :: tendi :: Replies: 5 :: Views: 1990
You have some strange delays in that program. It would be better to balance the timing so all the digits get equal time slots and equal spacing. You flicker is probably due to the slow down in the program while it performs long checking routines:
if(timer == 100)
Microcontrollers :: 12-13-2015 09:36 :: betwixt :: Replies: 8 :: Views: 731
This is second post on this forum. I am trying to understand contribution of buffer in the phase noise of LC VCO in any CMOS process especially at the low offset frequencies (1/f? region).
When one adds a buffer with the VCO core and simulate phase noise at both VCO output and the buffer output, the phase noise at the far offsets starts de
RF, Microwave, Antennas and Optics :: 09-24-2015 23:39 :: madnan479 :: Replies: 4 :: Views: 1032
Don't know what the "segment delay" value actually is, but there should be no problem to run the code in real hardware without flicker.
In case you are talking about flickering in the proteus simulation, I suspect a pure simulation problem. Adjust the timeout in the LED display properties.
Microcontrollers :: 09-16-2015 15:21 :: FvM :: Replies: 2 :: Views: 910
I am confused about the beat signal of the radar when I read some IEEE papers.
I have the following questions:
1. What is the purpose of the beat signal? To avoid flicker noise?
2. Beat signal only fit for LFMCW radar?
3. How to conduct beat signal in Radar? Is it the 1/T, T is the period of the waveform?
RF, Microwave, Antennas and Optics :: 09-04-2015 07:51 :: jiripolivka :: Replies: 4 :: Views: 880
Probably the bandwidth of your opamp is smaller than flicker noise corner frequency?
Electromagnetic Design and Simulation :: 07-09-2015 21:10 :: Dominik Przyborowski :: Replies: 2 :: Views: 720
I'm talking about flicker, not Harmonics. IEC6100-3-3, IEC6100-3-2 refers to Harmonics I think....it's minefield.
Power Electronics :: 07-07-2015 16:15 :: brushhead :: Replies: 2 :: Views: 537