Questions tagged [common]

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0
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2answers
110 views

Does Differential Amplifier Emitter behave as ground in AC-analysis?

I am trying to solve various differential-amplifier homework problems for which I have the solution to study. For the simplicity of most problems we are able to neglect base-currents. Moreover, it ...
1
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1answer
58 views

How to choose an inductor for a LCL filter?

I am trying to make a voltage generator. I used an inverter and it is controlled by a PWM signal. I used a LCL filter to filter the output signal since it is rich in harmonics but in the choice ...
-1
votes
1answer
39 views

Common/separated ground in dummy load?

My question is simple - maybe silly. I've got 2 circuits: MCU with DAC, ADC and another 3.3V electronics Dummy load (Max 24VDC). Do I need to connect two separate grounds (MCU ground and dummy load ...
0
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1answer
16 views

common source pole calculation vs. simulation

I would like to compare my pole simulation results to my hand calculations, I'm receiving quite a big error. when simulating a Common Source stage without output capacitance load there is a big ...
0
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1answer
93 views

Homemade EEG Circuit Common mode feedback

https://sites.google.com/site/chipstein/home-page/eeg-with-an-arduino/assembling-the-arduino-eeg-circult Hi, I am currently building a DIY EEG circuit using the guide above. This guide is for when ...
0
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1answer
132 views

Common mode and differential mode

I can't understand how to apply common mode and differential mode concepts. 1) I know that if I have two signals v1 and v2, I can always write them as: v1 = vcm + vd/2 v2 = vcm - vd/2 Example: v1=...
0
votes
1answer
137 views

Sound distorted from amp configuration, and one transistor variety getting too hot

The sound is distorted from my configuration. The transistor I'm using is an MPF4393. I need to add resistors and capacitors and how do I get more power (to make it louder) What should I add? Also ...
0
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1answer
37 views

Analysis of 3 Stage CS Ring Oscillator

I am new to the world of oscillators, so take it easy on me. I have been attempting to analyze the following common source ring oscillator: However, I am having some trouble here. So based on my ...
0
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1answer
53 views

mains earth and op-amp ground

I was trying to power a transimpedance amplifier built with an op-amp on a protoboard. I only had a power supply that looked like the first image below (no COM, which I would have connected to GND ...
0
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1answer
303 views

How to build a three-phase common mode choke in Matlab simulink?

How to build a three-phase common mode choke in Matlab simulink? Should I use the mutual inductor?
0
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1answer
63 views

University Project - Common Mode feedback in EEG systems

Basically EEG signals (potential from brain) contain 'noise' due to EMG signals (potential from muscles). I was thinking of using the EMG as a common mode feedback prior to the amplification of the ...
1
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2answers
2k views

Common ground : Computer A and USB powered Arduino ( MCU ) from Computer B

I have 1 computer, 1 laptop and usb powered arduino ( MCU ). Arduino is connected to laptop via USB cable. Laptop is connected to 220V wall or runs from batteries. One PIN from arduino is connected ...
1
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1answer
127 views

Linear and Switched-Mode Supply Common Shared

We have a mixed mode PCB system with both digital and analogue systems. Due to high speed they all share the same ground on the PCB, but use logical spatial separation to control noise. SO PCB input ...
1
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2answers
353 views

How to achieve common ground for a single ended input?

I'm using a current loop transducer as in the set up picture I provided. The transmitter is regulating the current proportional to a physical quantity and regulating the current. It is a typical 4 to ...
-2
votes
1answer
595 views

Common ground with two bridge rectifiers [closed]

I have a transformer with multiple taps on the secondary coil deliverin many different voltages and I want to know if I blow something up when I convert the AC of the transformer to DC with bridge ...
1
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3answers
1k views

Battery Wiring - 3 Independent systems with common ground

Background: Building a radio control wheel bot. Using a motor controller that recommends independent power supply for 1.) power to the controller and 2.) power to the motors. Also want a 3rd power ...
-1
votes
1answer
264 views

NPN switch: What is wrong with this circuit?

I'm trying to use a single source for both output and an NPN switch (5V - 2Amp). I cannot get higher than 500mA at the output, with VLoad about 4.3 V max. simulate this circuit – Schematic ...
-1
votes
3answers
1k views

Question about common emitter configuration?

The configuration of the common emitter amplifier is one resistor at the emitter, on resistor at the collector, two bias resistors at the base as shown in this picture : I saw this new configuration, ...
-1
votes
2answers
16k views

how to choose resistors' value for common emitter amplifier? [closed]

I want to choose the best values of R1 , R2 , R3 and R4 to get the maximum gain (high performance). I design the circuits practically, so I don't need to do a lot of calculations. I want the ...
0
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2answers
289 views

MOSFET amplifier

I found the following problem in the Rashid book of microelectronic circuits. I am looking to solve it but I don't even know where to start. How can I solve everything? What results do you get so I ...
0
votes
1answer
120 views

Microelectronics NMOS amplifier

I am trying to solve a Sedra/Smith problem involving NMOS transistors. Given that both transistors are biased at the same point. Question is to find \$g_{m2}, i_d, v_{d1}\$ and the value of \$R_D\$ ...
1
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1answer
206 views

Charge Arduino through Computer but connect to external circuit

I'll explain what I'm trying to achieve first. I basically want to control a 4 wheeled robot through an Arduino but I need the Arduino to get the commands from a computer. I've already setup the ...