Something put into a system or expended in its operation to achieve output or a result

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30 views

Operational Transconductance Amplifier Input Configurations

I recently purchased several OTAs (Lm13700) but have had quite a bit of trouble using them. Going through the TI datasheet and a Nuts & Volts tutorial it's occured to me that transconductance amps ...
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42 views

Compressor capacity vs input power, Kelvins law

Have got a silly confusion regarding efficiency calculation of AC & Ref. compressors. Here is a sample of specs of an Aspen miniature compressor. ...
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1answer
27 views

“Differential Input Voltage” of “Fully Differential I/O Audio Amplifier” (OPA1632)

I want to use an OPA1632 as a symmetric signal receiver. The datasheet states: Supply Voltage, \$±V_{S}\$: ±16.5 V Input Voltage, \$V_{I}\$: \$±V_{S}\$ V Differential Input Voltage, ...
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1answer
34 views

Enable connected to unpowered regulator on another board

I have an ARM board which uses a VIO of 1.8V and requires that no i/o line be driven before it is fully powered up. It signals this readiness by asserting its "SYSEN" line. My design has SYSEN from ...
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0answers
25 views

Square wave oscillator (up to 5kHz) from -40V to -10V (approximately)

I want to test a depletion mode TFT which has a turn on gate voltage of about -35V and consequently I want to show that this TFT can be used as an inverter and find the maximum frequency at which it ...
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1answer
67 views

PIC 18F PORTA pins as input

I am working on PIC18F4550. I have configured PORTA Pin0-Pin3 as inputs using following code PORTA=0X00; LATA=0X00; ADCON1=0x0F; CMCON = 0x07; TRISA =0XCF; and ...
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1answer
47 views

Relay driver circuit with input referenced to positive

I built a standard relay driver circuit as shown in the first schematic here: It works as expected, but I now realized my input is between the positive terminal instead of ground. How can I adjust ...
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2answers
60 views

TTL to CMOS Different Supply voltages

I am designing a circuit using a CD4011 Nand Gate 5 volt Vcc and a CD4555 using a 15 volt vcc. Will the Nand gate High output have enough voltage to drive the input of the CD4555 to a High Output? ...
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0answers
30 views

Explain to me how values are read with pullup resistors [duplicate]

In the above picutre, it seems to me as if when the switch is open, a voltage of VCC is on the input pin (i.e., voltage comes in through the resistor, to the input pin then back to GND through the ...
2
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2answers
74 views

Temperature measurement into USB [closed]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
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1answer
59 views

How do I read my AC Adapter label. [duplicate]

My AC adapter reads... Output: +12V DC symbol 12.5A Input: 100-240V~ 50-60Hz 2.5A I would like some clarification on if i'm reading/understanding this ...
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4answers
101 views

Input and output resistance of an opamp circuit

Recently we have been working with opamps in the lab and I never can understand how to determin the output and input impedance of a circuit with op-amps (not the input and output inpedance of the ...
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2answers
79 views

Outputting 10V from 7 ports, low current

I'm working on a school project with a lighting unit that has seven inputs that read between 0-10VDC. I need some sort of microcontroller, relatively inexpensive, that can be programmed to output what ...
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0answers
38 views

Problem with Operating ATmega16 in Differential ADC mode

I have used ATmega16 in differential mode by configuring ADMUX as 01001111 for (Reference Voltage at AVCC and external capacitor at ARef, Left Adjustment, ADC3 as Positive Pin, ADC2 as Negative Pin, ...
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1answer
40 views

Number of possible IOIO pulse inputs

Looking at this page it mentions that double precision digital pulse input (32-bit timer) can be divided into 2 single precision 16-bit timers. https://github.com/ytai/ioio/wiki/Pulse-Input It says ...
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1answer
56 views

tramsformer input output

I have one machine with transformer from 208 3 phase to 400 3 phase, what will happen if I connect the transformer to 360 V 3 phase as input is it will be okay or not? Because the machine comes from ...
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1answer
43 views

Selectively outputting 2 inputs based on a third input

I currently have 2 inputs that can be on or off, they could be 00, 01, 10, or 11. I want to output them only if a third input is active. I figured BJT transistors would do the job, but they seem ...
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1answer
54 views

Enable pin with maximum 3.0v

I've an Enable pin active-high that have maximum voltage rating of 3.0v, but I use a 3.3v MCU outputs. I've also a 3.0v voltage regulator on board. Should I use resistor voltage divider or there is a ...
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2answers
305 views

Is there a way to find the transfer function from only your input and the steady state response?

I know that a transfer function has the general form of $$ G(S) = Y(S)/U(S) $$ where \$Y(S)\$ is the output and \$U(S)\$ is the input. However, if given the output \$u(t)\$ and the steady state ...
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0answers
118 views

PSpice gives a crazy plot

I am simulating the following circuit The input voltage is a PWL voltage source that I configured to get a unit impulse input. From Matlab I know I am supposed to get this response But this is ...
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2answers
168 views

Pull up resistor on Schmitt trigger IC input?

I have two different circuits on two different boards. The output of board A, let's say, is optocoupler based and hence, it has a pull up on it. This signal is connected to board B through an ...
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0answers
69 views

Input sensing level of STM32F0 microcontroller

I am trying to work with PS/2 protocol. It gives 5V as data '1'. Voltage level of stm32f0 is 3.3V. I am trying to take 5V from PS/2 protocol as input. But whenever I am trying that, it shows nothing. ...
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3answers
354 views

Why do we need bulky filters at the input stage of SMPS designs?

I usually see costly and large filters at the input stage of switch mode power supplies. Isn't the AC signal already filtered by the large capacitor (the 100\$\mu\$F one in this example) after the ...
3
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2answers
169 views

Verilog data input

Hello I am relatively new to verilog and need help on part of a project am working on. I need someone to guide me as to how you read data from an analog device. I bought an analog temperature sensor ...
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4answers
208 views

Can an opto-isolated input be analog?

Title says it all: can an opto-isolated input be analog or are they intrinsically digital? Why: I am looking to purchase a relay control board and am deciding between a few options. Here is my ...
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3answers
237 views

What are the mechanisms at work in a pull-up or pull-down resistor circuits with a push-buttons and a GPIO?

I have a question regarding the GPIO (from a Arduino board for example). How does it work exactly when you use it as an input pin? What are the mechanisms at work when you use it in a pull-up and ...
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1answer
112 views

24 volt on microprocessor input pin

I have got my hands on a Intel Edison system on chip. I would like to use it to detect non-zero voltage. For example I have a test point that could be either 0 volt or 24 volt and I want to detect ...
2
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1answer
114 views

Transfer function of a real opamp circuit

I know how to calculate the transfer function of an ideal opamp. But when calculating for a real opamp, should I use the Input Bias Current values specified in the ...
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0answers
158 views

Differences between MIPI-CSI1 and MIPI-CSI2

I'm trying to find what makes a difference between MIPI-CSI1 and MIPI-CSI2. From what I understand on this specifications document, they both work the same way, except that MIPI-CSI2 offers up to ...
2
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3answers
102 views

ESD protection for pH measurement electrode input

I want to puild a pH meter, which uses a normal glass electrode. Such an electrode behaves as a pH dependend voltage source (<+-500mV) with very high internal resistance (10MOhm - 1GOhm, depending ...
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1answer
105 views

When setting pin as input it getts pulled high, why?

I've hooked up a push button to GP1 and a LED to GP2 on my PIC12F683 and this is my code: ...
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2answers
95 views

How does one implement the following function with these tools provided?

Suppose I have a function defined as follows, such that it is expressed in POS form, with the product of the following max terms of 4 variables (A,B,C,D): 0,3,4,7,9,10,12,15 and I only have a 4 to 1 ...
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1answer
103 views

Input 5V 100mA, output 200mA

I am new to electronics. I have come across a problem which I face. Will need some advice from here, as I am a student and would like to know: is there any way I can increase current in a circle. ...
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1answer
50 views

Input protection with MAX366 exhibits very slow falling edge. Why?

I'm using the following circuitry to protect my microcontroller input pin from the dangers of the bad and ugly outside world (a trigger signal coming from an unknown source). The signal comes in from ...
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2answers
127 views

Phototelectric smoke sensor with microcontroller

I am trying to connect a photoelectric smoke sensor with Atmega328. The smoke sensor IC has pin 7 as the I/O pin which gives a 9V when smoke is detected. I have connected this pin to the input pin of ...
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1answer
100 views

Understanding the input specifications for a laptop adapter [closed]

The sticker on my laptop adapter claims the input should be INPUT: 100-240V~ 2.5A(2,5A) 50-60Hz What does all this mean? Here are a couple specific questions: Can the adapter accept anywhere ...
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0answers
118 views

Should my external analog input be isolated?

I want to build a device that samples analog signals from various measurement instruments via their analog outputs. The instruments have their own power supply, and all devices are powered from the ...
2
votes
1answer
203 views

What is the use of dual differential amplifiers in audio applications?

Why do audio amplifiers use dual differential pairs sometimes? Is there a mathematical justification and not just "the joy of symmetry"? Any hints, especially with some math would be of great help. ...
2
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3answers
554 views

What kind of metal are the legs of resistors made from?

Can anyone tell me what kind of metal is used in electronics to make wires going in/out to the elements? Can longer of this metal wire be found anywhere? Actually I am looking for sth like copper wire ...
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3answers
122 views

How should a SPDT switch be wired for a digital input?

I want to connect a switch to a digital input on a logic board and make it so that the input goes high when the switch is pressed. I'll be using a SPDT switch: Should I connect the digital input to ...
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2answers
76 views

Need an extra pin to control my driver board

I've been searching for a way to add an extra pin to a driver board. The MCU board that i'm using only has 8 pins on the left side and i'm already using all of them. 2 are for powering the driver and ...
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2answers
186 views

Inputs to a Wiimote using a microcontroller

I've seen various methods of grabbing inputs and sensor data from Wiimotes and Wii Nunchuks as standard Bluetooth HIDs into microcontrollers like the Arduinos, but is there a way of sending button ...
2
votes
2answers
101 views

What is the difference between digital input with low bias and digital input with high bias?

I have 3 inputs. Input #1 is low bias. I can hook up a 12V positive to input 1 and it will change it's state to 1 (or input is ON). Inputs #2 and #3 are high bias. Connecting a 12VDC to either of ...
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2answers
302 views

Invert PWM input with NOT gate

What practical advantages could there be in using a logic NOT gate IC (e. g. schmit trigger hex inverters) when compared to a simple NMOS + pull-up resistor inverter? I want to invert the PWM output ...
1
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1answer
228 views

How can I detect an open analog input pin?

Many of the Renesas micros have built-in support to precharge or discharge the sampling cap on analog inputs to be able to detect when the external circuit is disconnected. In the sample image, when ...
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6answers
210 views

Why is pin protection needed?

I have read this article about protecting input pins. One thing is still unclear to me — why is the protection needed at all with such a high resistance on the input pin inside of the ...
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2answers
115 views

How to create a circuit to reduce my H-Bridge Inputs from 4 to 2, much like the 4427 Dual Driver does?

My H-bridge is identical to the one here: http://www.robotroom.com/BipolarHBridge2.html I'm trying to reduce the number of inputs from 4-2 so I can control it with my arduino using the 2 inputs. In ...
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3answers
150 views

Custom PC input peripheral

I would like to somehow plug an extra button to my computer that when pressed would execute some shell script. Backstory: I'm a programmer and I very much wish I had a big red button to commence the ...
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2answers
738 views

Atmel Xmega ADC input voltage range - Can the ADC be damaged by exceeding it's reference voltage, if the input is still less then VCC?

I've been working with Atmels ATxmega parts a lot recently, and there is one question I still have that I have not been able to find a answer to, even after scouring the datasheets. Basically, The ...
2
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1answer
136 views

How to work out or calculate this circuit?

I'm not an engineer, I understand a lot but I fail to understand how it works and how to calculate this for a 24vdc input: