Questions tagged [common]

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Input & Output Impedances of Common Emitter BJT Amplifier

I want to study about "finding Input & Output Impedances of Common Emitter BJT Amplifier" However, I could not find a decent source & document about it. Could someone supply me with ...
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1answer
43 views

Common mode filtering a shunt: “active” vs. “passive” strategies (diff. amp vs. common mode choke)

If you are trying to observe a relative small voltage across a shunt resistor and you are finding common mode noise interference induced in the signal, in what cases would you choose to use something ...
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0answers
116 views

Common Source vs. Common Drain for N-Channel Switches

Most discrete load switches I have seen (Using N-Channel FETs) have been in the common-source configuration. What, if any, are the operational differences between this and the common-drain ...
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0answers
71 views

Sharing ground with high current circuit

I'm designing an electrolysis machine controlled by an ESP8266 that also monitors the current and voltage of the electrodes with an INA226. There are two separates power supplies, 3.3V,1A power supply ...
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2answers
61 views

How to connect the ground in this common base schematic to a breadboard? [duplicate]

I just want to know how do I connect the ground in this common base circuit. I know how to connect two DC sources but I'm confused on how to connect the ground. I have adept knowledge about the ...
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1answer
45 views

(Basic) How to connect the ground in this schematic to a breadboard?

I just want to know how do I connect the ground in the circuit. I know how to connect DC source but I'm confused on how to connect the ground. I have adept knowledge about the concept of ground, I ...
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1answer
47 views

What is a digital common?

I am working with Benthowave BII-7186 Miniature Probe Hydrophone. In its datasheet I have come across the following information about wiring: I am not sure what is Digital Common, and how different ...
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4answers
633 views

Voltage divider bjt biasing with thevenin theorem

Say I have this circuit: I am confused as to how using Thevenin's theorem yields correct results. Say I choose a bias point on an I-V characteristic curve at the IC = 16mA. If this transistor has a ...
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1answer
126 views

CE power amplifier design

I am trying to further my knowledge in discrete transistor design so I am designing a CE power amplifier to drive a speaker. What I have trouble with is determining where to bias my BJT at. I can't ...
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1answer
40 views

Establishing common ground between attiny and 24v motor, and between attiny and 12v logic circuit, without connecting 24v motor and 12v logic grounds

I have a coin hopper which has a 12V logic circuit and a 24V motor. It also has 2 brass plates which sense the amount of coins in the unit, one plate has high voltage, and second has low. These plates ...
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2answers
116 views

Did I get this BJT configurations correct?

I'm trying to learn what kind of BJT transistors are this: Did I get them right?
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1answer
102 views

Do all common grounds end up to the chassis ground?

I'm new to electronics, and still wrapping my head around "common" and "ground." The schematic is: My question is if ALL the solid black grounds/commons end up at the one going to the cap/resister ...
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1answer
227 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 ...
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1answer
92 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 ...
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1answer
70 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 ...
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1answer
165 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 ...
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1answer
204 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 ...
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2answers
377 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 ...
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1answer
100 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 ...
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1answer
393 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=...
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1answer
773 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?
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1answer
170 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 ...
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1answer
77 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 ...
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1answer
700 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 ...
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3answers
2k 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 ...
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1answer
137 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 ...
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1answer
317 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 ...
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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, ...
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2answers
19k 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 ...
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2answers
319 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 ...
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1answer
128 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\$ ...
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1answer
212 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 ...
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2answers
3k 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 ...
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2answers
452 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 ...