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30 Threads found on edaboard.com: Ground Ripple
Hi In dummies connection can I connect the gate with source to ground without the drain. because I have the drain of this dummy connected to another transistor which is not connected to ground Thanks
AC supply probably has lots of 100Hz ripple. Measure it with no load and full load signal. Each power amp is probably oscillating above 100Khz causing overheating. If it gets hot with no load, put 2.7Ohm 0.47uF as indicated in specs or similar series snubber on each output to ground. If DC out is not matched at Vcc/2, offset the offending one wit
If your probing is accurate ( e.g. no probe ground inductance effects above 10MHz or ground shift ) Examine the ripple closely for AC and DC content. If there is no positive spike, it would appear to be resonant free. In your case the ripple is -20mV mostly at 16kHz but also +10mV component perhaps near 1 MHz. Reducing (...)
you can use 0.3E/1A ferriet bead, with 10uf & 0.1uf capacitor at both ends of bead and ground the another terminal of capacitor. this works fine for me.
LM2698 has no burst mode according to the datasheet. But it's essential to check for continuous switching without subharmonics and adjust the loop compensation if necessary. I think it's generally suggested to design staggered power supply filtering and use a well considered ground layout to achieve the intended low noise operation. A linear pos
None of cheap adapters has ground pin. Isolation between mains and output is sufficient safety method.
Put 1nf capacitor between filter and ground pin as per datasheet
I need a regulated voltage supply with +/-15V output in order to power an instrumentation amplifier circuit. The purpose of this circuit is to avoid a ground loop, so ground needs to be referenced by the application only and not by the power supply. I am thinking about using a solution with a 7815 and a 7915 regulator, similar to the one shown in
Hi. I've tried making an LM1875 amp in the past. The last time I had the rectifying diodes and decoupling caps on the same board as the amps and I even put on of the diodes across an input trace (kind of asking for humming). This time around I had the rectifier and decoupling caps on a separate board with a space of around 10cm between them. This h
surge currents can add up to ground shift noise and result in false data. Lowering the the voltage ripple is needed for most logic with noise suppression caps. Some high power logic like STTL need 1 cap per chip.
The Y caps are limited to the leakage current to ground spec for safety. I believe 0.5mA max. is still the cUL/CE requirement. The amount of attenuation depends on the source of egress and levels. It may be easier to snub the emitter levels at source if you find a good commercial line filter like the schematic you have shown fails to meet the
REturn Loss of Cap may affect stability. Can you scope current? 0.1Ω shunt? Type of ESR /SRF on cap affects ripple. Check specs and test. If you want to use an "active load " for testing , make a power transistor with heat sink and 0.01ohmshunt wire to ground. Then show I and V with scope as X & Y mode then you can simulate 10 ohm
This is because of noise and ripple. Place decoupling capacitors across all VDD and VSS pins. Place the capacitors as close to the VDD and VSS pins as possible. Between the pot wiper and the AN0, connect a 1k resistor. Connect a 1nF-100nF capacitor from AN0 to ground. At the input and output of your +5V regulator, place decoupling capacitors (10
Dear Friends, What is the use of bias resistor? Is it really helpful to reduce the noise or ripple in DC signals? FYI, I have a good amount of noise with ripple in a DC square wave signal with 2KHZ @ 5V amplitude. After connecting a resistor across +ve terminal of measurement terminal with reference to AI ground and also -ve terminal (...)
there are lot of reason. Outside noise not good ground plane. But can you tell us what is the level of the noise in volts and how you measure it.
Hello, I have just done output voltage ripple testing on a 40W offline flyback (switching at 67KHz). Vout = 16V I find that when i use the scope probe with "dangling" ground lead, i get 400mV peak to peak ripple at the switching frequency. .....When i remove the "dangling" ground lead, and "bring" the output (...)
If you are having trouble getting rid of ac ripple in your supply for a single supply op amp circuit, would it help to use a voltage divider instead of a zener circuit to provide the "ground" between the rails, in order to take advantage of common mode rejection? I am adding this note to the post because I learned after posting it that PSRR has
I've never seen an op amp circuit with both inputs connected to the same network and neither having a path to ground. I was trying to psych out the circuit, but I couldn't quite figure out how it works as a notch filter. Can you explain it to me? I know what a notch filter is, just not how this one works. I can see that there is a zero at about
You must be very carefull by measuring anything on an smps design. Start with keeping the ground lead of the oscillocope probe as close as possible to the probe (minimising the loop). Most of the times you can see a difference. Also try to measure with the bare probe tip and the ground lead wrapped as a spiral around the probe. With some probes
Linear regulator is basically a good idea, additional filtering may be meaningful. You should however consider other interference pathes than supply voltage when dealing with uV signals, particularly ground loops and inductive coupling. As you said, on-board switching regulator's interferences may be difficult to suppress, so it's easier if you