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199 Threads found on edaboard.com: Switch Cap
its just sparking from inrush current getting interrupted as the contacts make and brake repeatedly (bounce) as they come into contact. Its normal...if you want to get rid of it, use an ntc, or a zero cross detector and switch it on at the mains zero cross. Or try and make the input cap smaller. Or/and use a bigger ohms series resistance
yes switching on at mains peak, when no pfc bypass diode, or no big cap following rectifier, can result in overvoltage ringing of emc filter....best is to put some damping in and make everything sized high enough in volts to stay out of trouble.
Hi, I can't find any true storage coils. A breadboard is not suitable for testing high frequency switch mode power supplies. It may work or not. One simply can't fulfill the PCB design rules given in the datasheet. Klaus
Hi, There are circuits called "ideal diode". Maybe this is a good way. Or measure all voltages and select the highest one with a cmos switch. Klaus
Hi folks, I have four nMOS switches connected in Series with flying cap to boost input voltage to higher level ( circuit schematic attached). I am driving them using Arduino which has capability of 20mA/pin, my switches need only 5mA/switch, So I think I don't need a gate drive. The problem I am facing (...)
Hi Everyone, I would like to understand, what is actually causing ripples at the output of LDO design whenever there is a current switching, etc 0 to 30mA ?. In my test simulation, i'm including a ideal current source to switch from 0 to 30mA and the load cap about 100pF. I'm seeing the output transient ripples about 200mVpp during (...)
A mechanical 3 pin switch uses center pin (POLE) to switch to Normally Open (NO) or closed (NC) positions. It depends if it is a slide switch, , rotary or toggle switch. For low current, you may need to bypass cap to clean non gold plated contacts from oxide. For better reliability, gold plated (...)
127104 How can I get a current I=(Vref-Vin)/R, R is related to C*f from a switched capacitor network? Anyone can help? Thanks.
Hi everyone :), I'm new to this forum and working at the moment on my first analog design (thesis). As I'm designing a Low Power Relaxation Oscillator I have some troubles applying the trimming feature. When I connect my MIM-cap directly to the charging node everything is fine (good TC). After introducing DNW-NMOS switches to trimm the absolute
I suppose the pre-insertion switch S1 is closed before the DUT Q1 will be inserted, after this will be opened. This serves that the DUT's base potential initially is at GND, so the DUT cannot get destroyed by an initially possibly too high voltage from the charged cap(s) C1 and C2, if R8's tap wasn't at GND before. After opening the pre-insertion s
in a fully differential switch cap integrator the output common mode is set by a switch cap common mode feedback circuit. the theory of this can be applied in various ways. basically apply charge to a cap and switch the cap into your high impedance node. just remember a (...)
High side switch should be P type unless boost V is available... such as cap diode boost from PWM on lower side of synchronous totem pole output to bias upper switch. Where are your results? Note Vgs
Hello, I need a cap for this type of pushbuttons. Can someone please help me, where can I get it, or is there any 3d model ready for 3d printing? cap must not be too thick in diameter (about 4mm or so) and at least 10mm hight. It is urgent, I need
If your antenna had a built in resistor to ground, say 10k, it would be simple to have a 1~10M pullup and cap for low current to activate a P-ch MOSFET high side switch to de-activate the circuit, then activate when antenna 10K to ground without degrading the RF. PC's use the same method to detect a speaker connected (<100 Ohm) and video port acti
here is the problem: I want to use MOSFETs to transfer a voltage ranging from 0V to 80V like a switch. The MOSFETs provided by the PDK can endure 80V Vds at most, but can only endure 5V Vgs at most. The threshold is about 1.2V. So, how can I use the MOSFETs like this to form a switch to transfer a signal whose voltage ranges from 0V to 80V? I
It was good that you used a short probe ground. I wonder how long the signal path and ground return is for the 0.1uF cap to supply. Let's look at the ringing on the signal closely. The overshoot is ~33% at a 1/2 division of 400ns/div= 200ns or 5MHz . We know there must be a 2nd order LC effect. At 5MHz , 0.1uF is 300m The impedance at 3.3M
Hi, for this application I would recommend a monolithic buck converter IC such as the LTC1076 with an input voltage up to 60V and an internal switch up to 2A. To set the current through the LED strip to 1.2A, use a shunt resistor of 2.21V / 1.2A = 1.8Ω in series with the LED strip for the LTC1076 feedback input. This must be a 3W resistor sinc
Yes, a LM 35 and a comparator can work. There are bimetal switches set to 100 deg.C that can also switch a high current quite reiably. No electronics ad no power needed.
Diode in reverse only works when diode is across motor to supply , V+ for both low side switches. otherwise diode across motor to gnd. for high side switch. Then driver is protected for Vmax and diode current rating must match driver for continuous current. Small cap across motor may reduce EMI. Current will be limited by RdsOn or (...)
A similar R/CR diode structure is built into every input. See ESD protection current. Ensure switch is isolated from finger discharges to signals with 15 mm clearance for 15kV isolation. Do you want cap at 0V on power up then pulled up with switch to ground and power up closure? DOes it have software controlled pullup on input? Choose (...)