Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #278344 | Initial revision | — | about 4 years ago |
| Answer | — |
A: High pass filter design > How the real pros would translate these needs into design rules for a calculator? Speaking as a pro I wouldn't use a calculator because I'd use a simulator and tinker with a few values until I got the response I wanted. I'd probably use standard building blocks like high-pass sallen key filte... (more) |
— | about 4 years ago |
| Comment | Post #278342 |
There are plenty of references to be found on google on this subject so pick one and, if still confused then ask a more specific question. (more) |
— | about 4 years ago |
| Edit | Post #278343 | Initial revision | — | about 4 years ago |
| Answer | — |
A: Purpose of emitter resistor in a common collector amplifier If you are AC coupling to a load then you need an emitter resistor to set the DC operating point and quiescent current of the amplifier. An external AC coupled load cannot do this and, it needs to be done to ensure the amplifier works as intended. If your load is a resistor and directly connected ... (more) |
— | about 4 years ago |
| Comment | Post #277844 |
Olin I read through it and still genuinely don't understand what it's about. Maybe a front/top section that says what it's really all about would be helpful. Sometimes when you are inside an idea or a solution you can miss-out on explaining why it is needed or, plainly I'm just stoopid and blind. I g... (more) |
— | about 4 years ago |
| Edit | Post #278212 |
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— | about 4 years ago |
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— | about 4 years ago |
| Edit | Post #278212 |
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| Edit | Post #278212 |
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— | about 4 years ago |
| Edit | Post #278212 | Initial revision | — | about 4 years ago |
| Answer | — |
A: How to define Vsat for MOSFET as a switch? $$\boxed{\text{What maximum value of } I{OUT} \text{ did you have in mind?}}$$ Using \$I{OUT}\$ and \$V{OUT}\$ we calculate power uplift. Using power uplift and switching frequency, we calculate how much energy the inductor needs to store (and transfer) in each switching cycle: - $$\text{Power... (more) |
— | about 4 years ago |
| Edit | Post #276225 |
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— | about 4 years ago |
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— | about 4 years ago |
| Comment | Post #276267 |
@zeke they are micro-cap!! However, I don't know what Patreon is and I don't understand the youtube reference??? (more) |
— | about 4 years ago |
| Comment | Post #276267 |
@zeke Thanks. No not on either. Are you talking about music? (more) |
— | about 4 years ago |
| Comment | Post #277301 |
Your circuit WILL NOT work with the load negative connected to ground. (more) |
— | over 4 years ago |
| Comment | Post #277301 |
Your circuit is incorrect on the output. The load needs to connect between the source and a positive supply voltage not ground. Your hyperlink doesn't work and you haven't shown the value of the MOSFET source resistor. You haven't mentioned what op-amp supply decoupling you have used either. Assuming... (more) |
— | over 4 years ago |
| Edit | Post #277276 |
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— | over 4 years ago |
| Edit | Post #277276 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Complementary transistor pairs - what is the point ? To understand why complementary pairs are used, it's probably a good idea to think about the limitations of the NPN emitter-follower circuit: - Image alt text It's a good circuit for delivering modest powers to a load but its main disadvantage is that it dissipates excessive power in the emitte... (more) |
— | over 4 years ago |
| Comment | Post #277051 |
@coquelicot there is capacitive coupling between all the wires in the bundle that make up the cable. L2 is not ideally split halfway of course because that would make the L2 voltage become 60 volts. (more) |
— | over 4 years ago |
| Edit | Post #277051 |
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— | over 4 years ago |
| Edit | Post #277051 | Initial revision | — | over 4 years ago |
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A: How could a damaged wire in split-phase power delivery create these voltages? > When the outage occurred, I observed the following - The L1/G voltage difference was 120V (good). - The G/L2 voltage difference was 90V (bad). - The L1/L2 voltage difference was 30V (very bad!). If the L2 wire was broken then, due to capacitive coupling between L1 and L2 (and the use of... (more) |
— | over 4 years ago |
| Comment | Post #276952 |
..... I spent a whole year on one job trying to find an answer to this specific type of problem where a device had allegedly passed an impulse test but there were no records kept. In the end I concluded that someone had added TVS diodes to a design after testing had been done, didn't do their homewor... (more) |
— | over 4 years ago |
| Comment | Post #276952 |
Can you address my questions above as a comment because I don't want to have to trawl through the whole question trying to work out things. What I can say is this: without knowing what specific testing destroyed the devices is not going to help..... (more) |
— | over 4 years ago |
| Comment | Post #276952 |
What testing was conducted that destroyed the failed devices? Are you looking for reasons behind these failures? Can you be specific about what advice you are seeking? What insulation have the load cell bridges got from the grounded rail? What specific tests were conducted? Was it ESD or indirect lig... (more) |
— | over 4 years ago |
| Edit | Post #276319 |
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— | over 4 years ago |
| Comment | Post #276809 |
@Olin - not sure I was. I can't remember proposing a new site. Maybe it was something I said once? Hold fire on me being a mod. (more) |
— | over 4 years ago |
| Comment | Post #276809 |
Well, it's risen back a bit from 316 to 321 but it still hasn't returned to circa 352 so, I'd say that it isn't fixed. I agree with Olin, about mods getting the right tools to do the job. As a plain ordinary user, there isn't enough information that I can find that tells me where up-votes or down-vo... (more) |
— | over 4 years ago |
| Edit | Post #276809 | Initial revision | — | over 4 years ago |
| Question | — |
Strange things happening Why has my reputation dropped significantly over-night from around 352 to 316? Why are there a bunch of new people listed with decent reputations who seem to have appeared from nowhere? (more) |
— | over 4 years ago |
| Comment | Post #276662 |
Safe after two faults is the reason. They all, individually, have to be able to survive the input current that might pass through the fuse indefinitely. (more) |
— | over 4 years ago |
| Edit | Post #276662 |
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— | over 4 years ago |
| Comment | Post #276662 |
@Hawk2000 The barrier doesn't care about energy transferred to it; rather it's the other way round. The barrier is situated in a less onerous gas environment so clearly, it is protecting down stream (into the more onerous gas environment) from excessive energy. The barrier "buffers" anything on its i... (more) |
— | over 4 years ago |
| Edit | Post #276662 |
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— | over 4 years ago |
| Edit | Post #276662 | Initial revision | — | over 4 years ago |
| Answer | — |
A: How do I calculate and manipulate the inductance and capacitance of outputs to a connector on a PCB? > How do I calculate the inductance and capacitance out from the barrier to make sure it is less than the sensor values? The output capacitance and inductance from your zener barrier is irrelevant - you design the barrier components (fuse, zeners and output resistor) to limit the short circuit ... (more) |
— | over 4 years ago |
| Edit | Post #276438 |
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| Edit | Post #276349 |
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| Edit | Post #276438 |
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