Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #278475 |
Then we need a schematic of the actual power supply. This is exactly the problem behind answering your question - you are changing the goalposts and wasting time. I'm not going to do any physical experiments, after all? Why should I? Like I've said many times here: the devil is in the detail and you... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
It also names the DC voltage as an error voltage and that is totally wrong. Like I said, the devil is in the detail and, in my humble opinion, if you want this question answering with respect to CM noise you need a believable circuit tied to a recognized power supply topology. The ElecCircuit.com pic... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
The circuit is still problematic. It isn't a conventional flyback converter (that require extensive CM filtering due to a lack of earth) because flybacks don't use a bridge rectifier. So maybe it's a forward converter that deal with higher power transfer (than flybacks) and usually have an incoming e... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
The circuit you have posted will not have any significant degree of common mode noise because it is not an isolating DC-to-DC converter because the same GND symbol is used on either side of the transformer. This is so absolutely the reason why a circuit is needed. The circuit will only produce differ... (more) |
— | over 3 years ago |
| Comment | Post #278477 |
I said this: *Can you adjust your question to more fully reflect your aim?* and I didn't imply it should be common mode or differential but, **what you had in mind**. I just want to restate this. (more) |
— | over 3 years ago |
| Comment | Post #278475 |
You still need to focus your question though. Asking for a schematic is also problematic because it just may not be the topology that is most appropriate to you. If I answered and you then said "yes but what about this or that converter" I'd have been wasting my time on the original answer. You have ... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
I think you misunderstand it from the view of someone answering. Someone answering can make an answer aimed at a specific design and provide good information. Then, if I were answering, the way my brain seems to work is that I could sit back and think how this might be applied to similar (but not ide... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
Can you adjust your question to more fully reflect your aim? (more) |
— | over 3 years ago |
| Comment | Post #278482 |
Do you want me to lie to you and say yeah it'll be fine? The above are my general thoughts. The devil is in the detail. (more) |
— | over 3 years ago |
| Edit | Post #278482 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278482 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278482 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Control circuit for Power Converters These are my general thoughts: - - Easiest - power management IC (PMIC) - Smallest footprint - PMIC usually - Cheapest - usually PMIC (for a certain minimum performance level) - Highest performance - PMIC will outshine all others - Best reliability - PMIC - Best stability - PMIC - Qui... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
Are you talking about common mode noise that simultaneously affects both pos and neg output on the DC side (due to capacitive coupling in the transformer) or just differential noise i.e. conventional ripple artifacts? Both are treated differently and both these noise sources depend on different thing... (more) |
— | over 3 years ago |
| Comment | Post #278461 |
Surely google is a better fit to find this out. Have you googled MOSFET body diode? (more) |
— | over 3 years ago |
| Edit | Post #278448 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278448 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278448 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278448 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278448 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Filter Impedance Consideration Apart from the need to match impedances to prevent possibilities of signal reflections and the knock-on issue of signal nulls at your receiver LNA input, an antenna "expects" to be terminated in the "right" impedance in order to get best performance. The ratio of E-field to H-field of a radio wave... (more) |
— | over 3 years ago |
| Comment | Post #278378 |
Your question really has nothing to do with SSB - look at how regular AM is shifted in frequency down to baseband rather than jumping straight into SSB. (more) |
— | over 3 years ago |
| Comment | Post #278342 |
ESD can cause damage that only shows itself when operating in a real circuit close to its voltage limits. In other words, ESD can degrade a component that causes it to fail early and not immediately. (more) |
— | over 3 years ago |
| Edit | Post #278344 | Initial revision | — | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Edit | Post #278343 | Initial revision | — | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Edit | Post #278212 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278212 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278212 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278212 |
Post edited: |
— | over 3 years ago |
| Edit | Post #278212 | Initial revision | — | over 3 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) |
— | over 3 years ago |
| Edit | Post #276225 |
Post edited: |
— | over 3 years ago |
| Edit | Post #276225 |
Post edited: |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #276267 |
@zeke Thanks. No not on either. Are you talking about music? (more) |
— | over 3 years ago |
| Comment | Post #277301 |
Your circuit WILL NOT work with the load negative connected to ground. (more) |
— | over 3 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 3 years ago |
| Edit | Post #277276 |
Post edited: |
— | over 3 years ago |
| Edit | Post #277276 | Initial revision | — | over 3 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 3 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 3 years ago |
| Edit | Post #277051 |
Post edited: |
— | over 3 years ago |
| Edit | Post #277051 | Initial revision | — | over 3 years ago |
| Answer | — |
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 3 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 3 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 3 years ago |