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1answer
44 views

Basic questions on biasing

I have some trouble understanding a basic concept. Here is my question. This is from a document which can be found on the website, http://www.ti.com/lit/ug/tidu765/tidu765.pdf The text ...
0
votes
1answer
64 views

Bias resistor in opamp circuit

For the circuit below, what is the purpose of the 2 bias resistors. They are said to detect breaking, what does it mean.
-3
votes
4answers
181 views

How do I reverse-bias a resistor?

We all know that a photo diode can be used as a light detector and as a light emitter (although the way that it's built will usually make it specialized to prioritize one application over the other); ...
0
votes
1answer
97 views

Why Use a Biased Resistor?

As a school project I was wiring up an IR LED in series with a biasing resist. I was using a breadboard and a vex cortex controller. I understand that a resistor is important because it prevents the ...
0
votes
2answers
206 views

BJT Transistor Biasing Problem

If I have the circuit where I have Vcc = 30V and Vee = -30V. Transistor's beta equals 300. I want my Ic to be around 10mA and Vce = 25V, Vrc = 25V, Vre = 10V. I want to bias the base of transistor ...
1
vote
2answers
2k views

Setting the bias for the power amp section of an audio amplifier?

I've been working on the internal amplifier of SW-12 active subwoofer. I started suspecting its power amp section may not be working properly. (I get musically coherent sound out of the attached ...
1
vote
3answers
187 views

What is the voltage drop across resistor in this circuit?

There is an example in the book 'The art of electronics - 3rd edition' that I can't understand. The issue is: How the voltage 0.6V goes to the diode D2 without a drop across R1. This question is ...
-1
votes
2answers
188 views

Calculating resistor values for an amplifier

How do we calculate the value of the resistors Rb and Re? The information given are limited: (β = 600) Ic = 10mA. It is always preferred to have a symmetrical output voltage swing.
4
votes
1answer
1k views

Does biasing of address pins require a resistor?

I'm a total newbie fooling around with a project of mine. I want to use an MCP23017 I2C port extender (Data sheet) for my Arduino project. The chip has three hardware pins that must be externally ...
1
vote
1answer
991 views

Is Rg, calculated in the linked PDF calculating the pulldowm/pullup resistor for a MOSFET gate?

I stumbled upon the following paper while looking for ways to calculate a specific value for the pullup/pulldown resistor for the gate of a MOSFET. I see several calculations for Rg. Is that the ...
1
vote
5answers
10k views

Pull-up resistor over a microphone

What is the reason of that 1 kilo ohm connected to the microphone? Why always too high resistors are used? I couldn't find any explanation. How do we calculate these values?
6
votes
6answers
29k views

What is the purpose of a bias resistor?

Could someone explain what "bias" is. And why do some devices need an external bias resistor?