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1.2k posts
 
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Q&A how to figure out the max power of a transformer?

If there isn't a VA rating on the label or published in a reliable source, then you have to guess. There are several clues that can be used: Look at the size of the primary wires. That gives you...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

Answer
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+0 −0
Q&A Pulse disappear in digital scope just by looking at different signal in other channel.

I have a HANTEK 6022BE oscilloscope and I'm monitoring three signals with it: FS (Frame sync clock). Pulse. Transfer complete. I'm using two channels of the scope to monitor a pair of these...

1 answer  ·  posted 2y ago by mohammadsdtmnd‭  ·  last activity 1y ago by Lorenzo Donati‭

Question oscilloscope
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Q&A What are these transformer graphs about?

This picture describes the behaviour of a single phase transform under resistive,inductive and capacitive loads(from left to right) How what exactly is $V_{1}$ ?Is it the voltage at the primary ...

1 answer  ·  posted 1y ago by Volpina‭  ·  last activity 1y ago by TonyStewart‭

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+1 −1
Q&A how to figure out the max power of a transformer?

I have a MOT that is rated 220V-50Hz only and i need to know its maximum operating power i tried to google the reference number but unable to find anything about its power, so how to figure out the...

2 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Jasen‭

Question transformer power
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Q&A What is the role of master clock speed on DAC

Question 4 solved: The datasheet lacks the information I've copied from PCM5122:

posted 1y ago by mohammadsdtmnd‭

Answer
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Q&A What we call this opamp configuration? [SOLVED]

What we call this opamp configuration?   A mess. What's the advantage and the disadvantage of this circuit? This can't be judged without the stated objectives. It might be useful for keepi...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

Answer
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+2 −2
Q&A Role of C2 (bypass capacitor)

I have been reading about thermal noise in resistors and I have a question: Suppose we have this circuit: Is C2 here to protect the voltage source from thermal noise?

2 answers  ·  posted 1y ago by Volpina‭  ·  last activity 1y ago by Andy aka‭

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Meta How to treat data communication questions?

I think these kind of abstract/big picture data communication questions should be on-topic here. Such as the mentioned question about the OSI model. I've been actively pushing for software.codidac...

posted 3y ago by Lundin‭

Answer
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Q&A How long does it take for energy to propagate in a circuit?

This is someone trying to rehash a Light experiment with circuits, however I do not think it holds up. Inside a medium, charged particles are subject to Drift Velocity. When you work through the ca...

posted 3y ago by Meat5000‭

Answer
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Q&A What is minimum resolution here?

In this datasheet it says that the minimum resolution is 0.1uA for the 10mA range.What is this minimum resolution?Is it the sensitivity of the multimeter for the 10mA range?

1 answer  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by dsr‭

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Q&A MOSFET not turning completely off

Hello everyone, I have a simple circuit in which I control some LEDs via an MCU and DMG2302UK ( N-channel MOSFET ) The EN pin is connected to an MCU gpio pin that works at 3.3V. The circuit wo...

1 answer  ·  posted 3y ago by AhmedMobarez‭  ·  last activity 3y ago by Olin Lathrop‭

Question MOSFET
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Q&A Capacitors of voltage regulators [closed]

Assuming we have a voltage regulator : Why do we have to ground Vin and Vout using 2 capacitors just like that?Co could be to provide a low resistance path to GND at high frequencies but what is...

0 answers  ·  posted 3y ago by MissMulan‭  ·  closed 3y ago by Olin Lathrop‭

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Q&A Find feedback of circuit

I must admit that your question (the described problem) is an interesting one. Speaking about the circuit (without consideration of the parts values), there are two feedback effects: At first, ...

posted 3y ago by LvW‭

Answer
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Q&A Unexpected phase shift in results

There is a mistake in the last line: $$\eqalign{V_{C_1}(t) &= V_1(t) - RI_{C_1}(t) \cr &= \sin(t) - \dfrac{\sin(t) + \cos(t) - \mathrm{e}^{-t}}{2} \cr &= \dfrac{\sin(t) - \cos(t) + \m...

posted 3y ago by coquelicot‭  ·  edited 3y ago by coquelicot‭

Answer
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Q&A JFET equation of current

Is this equation valid only when a JFET in saturation mode , correct? because in the ohmic region the JFET acts like a voltage controlled resistor and increase in VDS increases the resistance of th...

0 answers  ·  posted 3y ago by MissMulan‭

Question voltage current JFET
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Q&A Is this AD8307 fake?

I am not familiar with that chip, and only took a very quick look at the datasheet. Here is the block diagram of the part from the top of the first page: A few things pop out from this: This c...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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Q&A Is there a way to reliably measure antenna return loss outside a lab?

The RSSI detector in the receiver is the best field tool. In Windows I had a tool (Wifi Radar?) that read the Broadcom IC RSSI and displayed a time plot of the results as I changed laptop orientati...

posted 3y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

Answer
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Q&A Current and voltage in AC circuits without impedance

How can we find the equation of current and voltage of a capacitor circuit if the input voltage is AC without using the impedance formula Xc = -jωC?. We have for homework to find the equation of...

1 answer  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by Olin Lathrop‭

Question voltage current AC
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Q&A Modelling tunnel diode relaxation oscillator

I have been trying to model this oscillator I was wondering if we can somehow predict the frequency of the oscillations.For small currents inside a diode from the Shockley diode equation $$ e^{x...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta A community-maintained list of abbreviations used in electrical engineering?

At Somewhere Else, we started an initiative to make a community-maintained list of abbreviations used in electrical engineering: What are abbreviations used in electrical engineering? I think it c...

2 answers  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Olin Lathrop‭

Question discussion papers
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Q&A Results of analysis of Hartley oscillator dont make sense

This LC circuit depends on several criteria for stable linear oscillation; 180 deg phase shift ( with 3rd order LC network) plus 180 degree inversion to achieve the oscillation criteria of 0 or ...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

Answer
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Q&A Can confusing the plugs for earphones and microphones do any damage?

If you mean electret microphone, no damage to JFET buffer. Microphone input won't damage a headset with it's current limited pullup resistor for electret Mics.

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

Answer
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Q&A Flyback transformer with Intrinsic Safety

I think you are over complicating your thinking a little bit. For an associated device the only thing that matters is how you limit the energy going into the hazardous area. You put your zener barr...

posted 2y ago by MathieuJohnson‭

Answer