Activity for TonyStewartâ€
| Type | On... | Excerpt | Status | Date |
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| Comment | Post #290448 |
Can you measure or compute the L & C values? https://www.ti.com/seclit/ml/slup376/slup376.pdf (more) |
— | over 1 year ago |
| Edit | Post #290424 |
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| Edit | Post #290424 | Initial revision | — | over 1 year ago |
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A: Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor? The 70.9/40.8 A rating for L.R. is rated only for ; Locked rotor time 19s (cold) 11s (hot) I doubt this meets your requirements unless you modify from a forced air cooling motor to a pumped liquid cooling system. I'd contact a local oil-filled transformer supplier and get an autotransformer. ... (more) |
— | over 1 year ago |
| Comment | Post #290354 |
Charge pumps suffer from high very impedance output impedance leakage issues and are not worth the effort.
Murata package is my best recommendation.
https://www.digikey.ca/en/products/detail/murata-power-solutions-inc/NMV0512DC/5799183 (more) |
— | over 1 year ago |
| Edit | Post #290423 | Initial revision | — | over 1 year ago |
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A: CAN BUS monitoring with a LED You'll need a differential comparator, something like what was suggested in here. Imagealttext But I'd look for a proper Canbus Rx and extract that to convert to single ended one shot to pulse for activity. (more) |
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| Edit | Post #290341 | Initial revision | — | over 1 year ago |
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A: Ceramic capacitor "memory" effect? I have never seen this slow drift in ceramic caps, yet I have seen fast memory effect drift in S&H designs using high Dk ceramic capacitors in the 70's. So I have learnt that all ceramic caps have memory effects (except low Dk C0G/NP0's). The capacitance also changes with DC voltage, so Ic= VdC/dt +... (more) |
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| Edit | Post #290339 |
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— | over 1 year ago |
| Edit | Post #290339 | Initial revision | — | over 1 year ago |
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A: What fabrication process is being used for jellybean parts As of the early 2020s, common technology nodes for SSI (Small-Scale Integration) and MSI (Medium-Scale Integration) ICs include nodes such as 180nm, 130nm, 90nm, 65nm, 45nm, and 28nm. Each technology node represents a specific level of lithographic resolution that costs billions to create. Migrating... (more) |
— | over 1 year ago |
| Edit | Post #289916 |
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| Edit | Post #289916 | Initial revision | — | over 1 year ago |
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A: Driving LED with NPN transistor from I/O pin If you choose suitable ultrabright LEDs , there is no need to use 40 mA. I have over 10 thousand LEDs all over 16,000 mcd at 20 mA which is painfully bright for close indicator but works well 100 m away. They are also all matched brightness and Vf within 10%, but I ordered these special for a high ... (more) |
— | over 1 year ago |
| Edit | Post #289915 | Initial revision | — | over 1 year ago |
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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) |
— | over 1 year ago |
| Edit | Post #289904 | Initial revision | — | over 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) |
— | over 1 year ago |
| Edit | Post #289553 | Initial revision | — | over 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) |
— | over 1 year ago |
| Edit | Post #289550 |
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— | over 1 year ago |
| Edit | Post #289550 | Initial revision | — | over 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) |
— | over 1 year ago |
| Edit | Post #289549 | Initial revision | — | over 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) |
— | over 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) |
— | over 1 year ago |
| Edit | Post #289548 | Initial revision | — | over 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) |
— | over 1 year ago |
| Edit | Post #289547 |
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| Edit | Post #289547 | Initial revision | — | over 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) |
— | over 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) |
— | almost 2 years 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) |
— | almost 2 years 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) |
— | almost 2 years ago |
| Comment | Post #288225 |
Note: I just chose a small voltage with gain of -10 (more) |
— | almost 2 years ago |
| Edit | Post #288225 |
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— | almost 2 years ago |
| Comment | Post #288225 |
no. but you may want to define the purpose of the attenuator with a equation or function (more) |
— | almost 2 years ago |
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| Edit | Post #288225 | Initial revision | — | almost 2 years ago |