Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #286945 |
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| Edit | Post #286951 |
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| Edit | Post #286951 |
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| Edit | Post #286951 | Initial revision | — | over 1 year ago |
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A: Technique to reset pulse transformer core quickly > Is there any way to reset a core quickly without having ground / reference terminal pulled towards negative voltage Unfortunately not but, if instead of trying to send the complete pulse through the transformer, you send edge information (i.e. use a series capacitor to perform a kind of diff... (more) |
— | over 1 year ago |
| Edit | Post #286945 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Power amplifier for remote controller The data sheet gives a perfectly good example of using the nRF24L01 without an external PA. It has an internal PA capable of driving an antenna Is there a way to calculate the approximate range of this remote controller? You can use the Friis transmission equation to calculate the free-space li... (more) |
— | over 1 year ago |
| Comment | Post #282053 |
@#53586 welcome to the punishment planet (more) |
— | over 1 year ago |
| Comment | Post #286850 |
The fuse needs to be on the input supply side to the zeners and not the output to the sensors. (more) |
— | over 1 year ago |
| Comment | Post #286823 |
I hadn't really thought about an actual device but the TLV looks a decent choice. (more) |
— | over 1 year ago |
| Comment | Post #286823 |
I won't work using this type of chip with a massive impedance feeding the chip's Vcc pin. I've said enough on this subject now. Take heed or be prepared for disappointment. (more) |
— | over 1 year ago |
| Comment | Post #286823 |
The absolute maximum voltage the supervisor chip can survive is 7 volts. Two series batteries can be 8.5 volts when close to fully charged. And, if that wasn't a problem enough, you would need to use a PMOS FET in the positive lead else you could carry on discharging the battery through the MOSFET bu... (more) |
— | over 1 year ago |
| Comment | Post #286809 |
It draws 6 uA current and that will still deplete your battery. I'd be concerned about that but sure, in principle, that's the sort of comparator idea that fits in with my thinking. Check that it can handle supplies as high as 9 volts and, regards the resistor values, there should be enough informati... (more) |
— | almost 2 years ago |
| Edit | Post #286809 |
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— | almost 2 years ago |
| Edit | Post #286809 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Battery protection circuit > What kind of IC can be used to drive the MOSFET, so that when the voltage drops below 6.2 V the battery disconnects from the load? That reverse protection MOSFET works fine for reverse protection but, it cannot be used to turn-off the load when the battery is correctly connected. Look closely... (more) |
— | almost 2 years ago |
| Comment | Post #286792 |
The op-amp (beyond its local feedback) needs to have a resistor in series with the output that feeds the first inductor L1 else, it's not a Hartley oscillator. Please learn how to draw schematics correctly. (more) |
— | almost 2 years ago |
| Comment | Post #286793 |
Actually, to make this circuit work correctly, you need theoretically an extra resistor to ensure that the pi-network behaves like a 3rd order filter and not a 2nd order filter. This means that the op-amp MUST have output resistance (despite the circuit showing none). I mean, what's the point of the ... (more) |
— | almost 2 years ago |
| Comment | Post #286745 |
Yes, you could make a converter using a BJT oscillator and a transformer connected to a rectifier and smoothing capacitor but, it would be low-powered, inefficient and have poor regulation so, why would you bother? (more) |
— | almost 2 years ago |
| Comment | Post #286738 |
A BJT doesn't have a CE junction; it has a BE and BC junction. The yellow line you drew is too simplistic as is the graph you drew it over. Each curve in that graph has a differently sloped saturation region like [this](https://it.mathworks.com/help/examples/sps_product/win64/ee_npn_02.png). This mea... (more) |
— | almost 2 years ago |
| Comment | Post #286724 |
R/L is actually \$4\pi\$. You have inadvertently chosen to work in radians/sec but you didn't convert Hz to rad/sec. Rookie error. Also, you didn't appear to understand that the basic relationship involved is this: \$Q=\dfrac{1}{R}\sqrt{\dfrac{1}{LC}}\$ and, Q is centre frequency divided by bandwidth... (more) |
— | almost 2 years ago |
| Edit | Post #286714 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Complex frequency of a pole > if we don't apply a sinusoidal signal at the input s may become a complex number $$$$ All real-world signals exist only on the \$j\omega\$ axis. Consider that a complicated signal can be broken down into a fundamental sinewave and its harmonics. The harmonics are still sinusoidal an... (more) |
— | almost 2 years ago |
| Edit | Post #286547 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Unexpected impedance spike when paralleling capacitors I think you can make a pretty good case for the spike being caused by the addition of the 100n and 10n capacitors: - Image alt text > I assume that the solder blobs between capacitors introduced a series > inductance that in turn caused the spike in impedance at 8MHz. It can't be ruled out ... (more) |
— | almost 2 years ago |
| Comment | Post #286537 |
Your graph is for a PNP transistor yet you have drawn an NPN transistor (more) |
— | almost 2 years ago |
| Edit | Post #286493 |
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— | almost 2 years ago |
| Edit | Post #286493 |
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— | almost 2 years ago |
| Edit | Post #286493 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Thévenins Theorem for Transistor Circuit > Is the Thevenin's Theorem being applied incorrectly for the circuit ? It's being applied inaccurately. The final Thevenin voltage should be 2.782 volts (rather than your calculated value of 2.61 volts). I calculate the Thevenin resistance to be 759 ohms (near enough to yours so that it doesn'... (more) |
— | almost 2 years ago |
| Edit | Post #286435 |
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— | almost 2 years ago |
| Comment | Post #286435 |
You can tweak the MOSFET VGS threshold voltage with the addition of a VSB voltage. See [this](http://cmosedu.com/jbaker/courses/ee420L/s15/students/yurgelon/lab8/lab8.htm) (more) |
— | almost 2 years ago |
| Edit | Post #286435 |
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— | almost 2 years ago |
| Edit | Post #286435 | Initial revision | — | almost 2 years ago |
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A: What is this fourth connection in NMOS device? That fourth connection is the bulk/body/substrate connection: - Image alt text Image from here. On a normal 3 terminal MOSFET the "body" is connected to the source. On your device, the 3 n-channel MOSFETs share a common bulk pin that should usually be connected to the most negative voltage of y... (more) |
— | almost 2 years ago |
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