Activity for Olin Lathrop
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| Edit | Post #278548 |
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| Edit | Post #278548 |
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| Edit | Post #278548 |
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| Edit | Post #278548 |
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| Edit | Post #278548 |
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| Edit | Post #278548 | Initial revision | — | over 4 years ago |
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A: Is it possible for one transistor to switch between two loads? It's not clear what you are really asking, but here is something that might fit your requirements: Image First, R1 and R2 can be considered separate loads. The transistor therefore switches two loads. This circuit can also be used to produce two signals, one inverted from the other. This u... (more) |
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| Edit | Post #278522 | Question closed | — | over 4 years ago |
| Edit | Post #278477 |
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| Comment | Post #278484 |
@2kind: The secondary already needs to put out a bit higher voltage than you actually want. You don't want to do every pulse in a pulse on demand system, since that means there is no margin for higher current demand. I have used a linear post-regulator a few times, usually not for reduced ripple, b... (more) |
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| Edit | Post #278477 |
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| Edit | Post #278484 | Initial revision | — | over 4 years ago |
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A: Control circuit for Power Converters I'll assume by "PMIC" you mean a dedicated switching power supply chip. Such a chip contains the PWM generator and receives output voltage feedback at a minimum. They may also include a driver for an external FET as the switching element, include the switching element directly, include the diode wi... (more) |
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| Comment | Post #278478 |
Your original question asked "which is better". We don't do opinion-based answers here. I have edited your question to fit the site, else we would have to close it completely. (more) |
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| Edit | Post #278478 |
Post edited: Fixed to make on-topic |
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| Edit | Post #278477 | Initial revision | — | over 4 years ago |
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A: Filtering the high frequency noise in switching PSU A switching power supply already is inherently a filter. Current is coming thru an inductor, followed by a capacitor to ground. If you are asking what additional is usually done to filter out changes in the output voltage (not common mode, that's a totally different issue), then the typical answe... (more) |
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| Edit | Post #278465 |
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| Edit | Post #278462 |
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| Edit | Post #278465 | Initial revision | — | over 4 years ago |
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A: High Speed Design - Which grounding strategy to choose? You are right in that at high speeds, like over 2 GHz, things are different than in "ordinary" circuits. The post of mine that you quoted was written in the context of such ordinary circuits. The lumped system approximation that is valid for ordinary boards fails at high frequencies. You have to... (more) |
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| Edit | Post #278462 | Initial revision | — | over 4 years ago |
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A: Why there is a body diode in mosfets? in my engineering curriculum .. I never found a diode in a mosfet symbol Then you should ask for your tuition back, or perhaps the institution should want their diploma back. but in datasheets there is a diode called as body Right, because there is. It is possible to make such FETs without ... (more) |
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| Edit | Post #278449 | Initial revision | — | over 4 years ago |
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A: Filter Impedance Consideration If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(input to the LNA) to be large with respect to the source(antenna) in order to not attenuate the signal even further? Not necessarily. What you want is maximum power transfer, not maximum voltage. Power is... (more) |
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| Edit | Post #278445 |
Post edited: Removed content-free fluff |
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| Edit | Post #278421 |
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| Edit | Post #278421 |
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| Edit | Post #278421 |
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| Edit | Post #278421 |
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| Edit | Post #278421 |
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| Comment | Post #278421 |
@coq: No need to edit the question. The note makes it clear enough what is going on. (more) |
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| Edit | Post #278421 | Initial revision | — | over 4 years ago |
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A: I have to choose: Arduino or Raspberry pi. This site isn't appropriate for telling you what to choose. We can, however, give you information on microprocessors versus microcontrollers. Microprocessors and microcontrollers are intended to different applications. As a result, they have different capabilities, and different tradeoffs of use... (more) |
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| Edit | Post #278417 |
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| Edit | Post #275880 | Post edited | — | over 4 years ago |
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| Edit | Post #278380 | Initial revision | — | over 4 years ago |
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A: Mixers and Audio Extraction in a DCR Architecture It seems your question comes down to how to demodulate a SSB (single sideband) signal. Note that the single sideband is already the signal you want, just shifted by some fixed frequency. One way to recover the original baseband signal is therefore to frequency shift it. This is usually done by m... (more) |
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| Edit | Post #278378 |
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| Edit | Post #278341 |
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| Comment | Post #278354 |
The circuit you show has nothing to do with any "bootstrap" technique. Its a R-C low pass filter followed by a unity gain buffer. The rolloff frequency is 1/2πRC, which is 1.6 Hz for the 1 MΩ and 100 nF part values you cite. (more) |
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| Edit | Post #278346 |
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| Edit | Post #278347 | Initial revision | — | over 4 years ago |
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A: Is ESD overhyped? Yes, damage due to ESD (electro-static discharge) is real. Just because you haven't seen it isn't much evidence of anything. Some obvious possibilities why you haven't observed the problem are: You failed to create a proper ESD event. You didn't measure the results properly. The built-in E... (more) |
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| Edit | Post #278346 | Initial revision | — | over 4 years ago |
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A: Purpose of emitter resistor in a common collector amplifier First, let's nail down what circuit you are asking about. Your description is somewhat vague, so I picked this interpretation: Image Q2 is the emitter follower stage, driven by the previous common emitter stage of Q1. Your question seems to be why R2 exists. Some load is needed at DC to pu... (more) |
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| Comment | Post #277844 |
@Andy: Basically, using a PNP transistor around an LDO to detect input voltage high/low has been useful a few times, and I haven't seen it mentioned anywhere else. I may have generalized the problem too much so that it's not clear what the cute trick is. I should probably modify the *The Problem* s... (more) |
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