Activity for TonyStewartâ€
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A: derating MLCC ripple current for transient current spikes Remember that RMS measurements assume at least 1 cycle or in your case 100 ms or 10 Hz. So the Ripple Current/rms vs Temp rise is always valid for any duty cycle. This means in theory you can raise the current significantly since the spike is a very low duty cycle. In practice, the device will have... (more) |
— | about 1 year ago |
| Edit | Post #289904 | Initial revision | — | about 1 year ago |
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A: Will shorting a lithium ion battery cause an explosion? > Will shorting a lithium ion battery cause an explosion? Chain Reaction: The release of flammable gases can lead to a chain reaction, where the heat generated by the short circuit causes even more heat, which in turn generates more gases. This cycle continues to escalate the temperature and press... (more) |
— | about 1 year ago |
| Edit | Post #289553 | Initial revision | — | about 1 year ago |
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A: Why 3.3V instead of 3V? The other answers are excellent justification to the the industry standards imposed on CMOS logic. The historical migration to smaller lithography CMOS led to lower Cds values which led to faster rise times or higher toggle f's. However realize that the standard has been undocumented standards of 50... (more) |
— | about 1 year ago |
| Edit | Post #289550 |
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— | about 1 year ago |
| Edit | Post #289550 | Initial revision | — | about 1 year ago |
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A: What is Ground Electrode in EMG? CMRR design is key to rejecting grid e-fields that impose noise onto EMG, EKG,EEG amplifiers. This includes all series Zs of cable balance and Amp CMRR. For this reason >100 dB CMRR are required using INA's and not OA's with 1% R's (-40dB error). The same CMRR matching is required on 60/50 Hz... (more) |
— | about 1 year ago |
| Edit | Post #289549 | Initial revision | — | about 1 year ago |
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A: Essential safety features of an EMG/medical grade device? Current limiting input differential Rs of 1M into a 10M INA with clamp diodes make this a simple task. (more) |
— | about 1 year ago |
| Comment | Post #287196 |
I have successfully solved your problem in the past using a spreadsheet to to determine all the correct values for a potentiometer to give the the desired s21 response from 5% to 100% of the pot value chosen.
I trust you can easily do the same.
Anectdotal
__________
In my case I wanted to d... (more) |
— | about 1 year ago |
| Edit | Post #289548 | Initial revision | — | about 1 year ago |
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A: Power switches and automotive load dump, unclamped The spec 79V 0.5 ohm 5ms = 62.41 Joules . The TVS must be rated for a low temp. rise at this energy dump or higher. MOV's are limited by the number of discharges as the oxide wears out, but may be used if size appropriately for desired MTBF. (more) |
— | about 1 year ago |
| Edit | Post #289547 |
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— | about 1 year ago |
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— | about 1 year ago |
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— | about 1 year ago |
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— | about 1 year ago |
| Edit | Post #289547 | Initial revision | — | about 1 year ago |
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A: Can the corner frequency of thermal noise change with change in source impedance? Any time you have a dielectric interface ( pF ) source resistance will always have an error in signal response until the electrode impedance is eqal or less than the sub-cutaneous impedance. This will affect the expected 1/f noise response. Your goal is to reduce Rs and increase Cs with gel and ... (more) |
— | about 1 year ago |
| Comment | Post #287302 |
If "base voltage isn't applied" then Ib=0 & dIb=0 then the proposed formula with Ib is not logical. (more) |
— | over 1 year ago |
| Comment | Post #288260 |
The slip is necessary for the rotor to generate the torque required for rotation. This force also draws more current. (more) |
— | over 1 year ago |
| Comment | Post #288195 |
Otherwise using PWM pulsed energy to store power into a suitable inductor with CCM continuous drain you can match the average impedance with a circuit that does this with clamp protection where the % of drained current determines the reactive impedance as a voltage booster to a small stored capacito... (more) |
— | over 1 year ago |
| Comment | Post #288195 |
Yes If 6V exceeds the reverse voltage rating on the PV then a diode is needed. When the voltage drops below 6V the energy is getting quite small % so harvesting under these conditions requires high impedance loads and there are custom IC's to do this with great effort for small reward.
Perhaps yo... (more) |
— | over 1 year ago |
| Comment | Post #288225 |
Note: I just chose a small voltage with gain of -10 (more) |
— | over 1 year ago |
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— | over 1 year ago |
| Comment | Post #288225 |
no. but you may want to define the purpose of the attenuator with a equation or function (more) |
— | over 1 year ago |
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— | over 1 year ago |
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— | over 1 year ago |
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— | over 1 year ago |
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— | over 1 year ago |
| Edit | Post #288225 | Initial revision | — | over 1 year ago |
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A: Confusion in operation of analog computer The two-terminal symbol for the attenuator comes from 3 pin potentiometer (pot.) referenced to 0V = "GND" Image alt text The summing amplifier is always inverting and gives you 3 options for gain which means internally it uses a 3 pin pot. to choose the gain for you based on the ratio of resist... (more) |
— | over 1 year ago |
| Comment | Post #288010 |
@Carl That's good. It doesn't have to be the right leg either. It could be the hip or some other body part that doesn't move much. Then you can see what you are doing
with the lights on ;) (more) |
— | over 1 year ago |
| Comment | Post #287952 |
Low impedances suppress high impedance E fields so very high impedance inputs do not easily attenuate. Also very low magnetic B fields can induce low current which as you know if you have a nano-amp per meter induced on a one megohm R you get a 1mV signal which is a 1000 times bigger than a microv... (more) |
— | over 1 year ago |
| Comment | Post #288184 |
@#60854 SInce "no-load= open circuit" test, we are talking about mechanical load to a motor with zero torque load or electrical - no load when power is cut off to measure back EMF. (more) |
— | over 1 year ago |
| Comment | Post #288183 |
Ensure there are no stored voltages on any pin when power is applied, including avoiding switch bounce.
To test an IC with power off one can apply 2Vac with a 10k to 100k series resistor to each pin to check for short circuits or ESD damage. The V-I plots may be shown in XY mode on any scope an... (more) |
— | over 1 year ago |
| Edit | Post #288195 |
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— | over 1 year ago |
| Edit | Post #288195 |
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— | over 1 year ago |
| Edit | Post #288195 |
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— | over 1 year ago |
| Edit | Post #288195 | Initial revision | — | over 1 year ago |
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A: Over-voltage protection for device with photovoltaic cell source This IC is not well suited for the task. MPPT (Maximum Power Point Tracking) relies on matching impedance according to the maximum power transfer theorem. However, in the case of a photovoltaic array (PV), it functions as a current source with a voltage limit (Voc) and a short circuit limit (Isc).... (more) |
— | over 1 year ago |
| Edit | Post #288185 | Initial revision | — | over 1 year ago |
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A: What are these transformer graphs about? For R loads I is in phase with V. For L loads , V lags I up to 90 deg. For C loads, I lags V up to 90 deg. The trigonometric tangent angle is the ratio of impedance: Real to reactive. Your lectures or ref. book will give all the details. (more) |
— | over 1 year ago |
| Edit | Post #288184 |
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— | over 1 year ago |
| Edit | Post #288184 | Initial revision | — | over 1 year ago |
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A: How is it possible to perform a open circuit test on a induction motor? In an open circuit test, also known as a no-load test, an induction motor is operated without any mechanical load connected to its shaft. The purpose of this test is to determine the no-load losses, core losses, and magnetizing current of the motor. General Purpose: efficiency and performance ... (more) |
— | over 1 year ago |
| Edit | Post #288183 |
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— | over 1 year ago |
| Edit | Post #288183 | Initial revision | — | over 1 year ago |
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A: what should the output be for this use case of the CD4047 chip? Possibly it is damaged. Be ESD aware and do not power up with any voltage on any pins > 0.5V (Latchup failure) If raising p9 (reset) does not lower Q to logic "0"=<20% Vdd) replace the IC. No sweat, be more careful next time for handling failures of ESD etc. Most new IC failures are hand... (more) |
— | over 1 year ago |
| Edit | Post #288036 | Initial revision | — | over 1 year ago |