Questions tagged [output]

A signal or power being generated by one system for consumption by another, or a connection for that purpose.

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How can I boost the output current of this pulse generator (LF353, supplied with ±15 V) to above 25 mA?

I have a pulse generator design. Everything works fine, but it is required that the output current is above 25 mA. (The 9.69 kΩ is just a variable resistance to modify the output frequency.) ...
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Question regarding IBIS models

I have the IBIS models for this SY75603 PCIe clock buffer IC. However, the available IBIS model is only for the SY75603A with 85 Ω outputs; I'm using the SY75603B with 100 Ω outputs. What should I do ...
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Problem with output oscillation of voltage regulator

I am somewhat new to electronics and am trying to get the output of an LM350T_NOPB voltage regulator to have less than 50mV line noise at all loads <= 3A. Please refer to the schematic, ...
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Can a Zener diode protect an input pin that is driving low?

I am trying to protect a +5V Digital Output pin from miswiring to +12V, using a Zener diode. When I simulate a simple protection circuit, the zener clamps the voltage as expected: However this ...
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NOT gate output question

Newbie here with a very basic circuit question. I believe I understand how the transistor portion of the NOT gate depicted below works. What I am unclear about is why the output voltage Y changes from ...
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Combine two circuits in Multisim

I have two circuits, two separate simulations in Multisim, which work fine until I try to combine them. I tried a common ground, on-page connectors, added the voltage follower, but that didn't help. ...
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I can't get output voltage from flip-flop in PSpice

I'm simulation a flip-flop in PSpice, but it doesn't show an output voltage. This is testing a flip-flop; look at Q output. It shows X(undefine). I don't know if I'm missing anything in PSpice.
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What is the difference of summing left and right channel vs using just one of the two?

Speaking about the sound levels, which is the correct way to connect a stereo output to a mono input? Will the signal in case one be lower in amplitude, or is it not sessizable?
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Audio processing from Arduino

The project is to design a device with multiple audio inputs and multiple audio outputs. The device should be capable to map input and output audio channels. Output almost same as the input. At what ...
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Where does the finite output impedance of an op-amp model come from?

I often see op-amp's modelled with a finite output impedance or resistance as follows: Let's assume that the op-amp above is implemented with the following structure: From the transistor level ...
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Op-amp clarification in table

I'm using this Op-amp with Vcc of 5V and GND, voltage follower configuration. Input to the non-inverting terminal is 0-2V (from a DAC). Output pin is connected to the inverting terminal. Since, it's a ...
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4 answers
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Is an op-amp's output current limited by the supply (+/- Vsupply)?

As above. I'm looking at the OPA548. The max. output current is 3 A, but reading the datasheet, I'm unsure if that's from the +/- Vin or the +/- Vsupply.
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Does this phone charger circuit meet the USB port's 1 A current rating safely?

Vp = 170 V; Vrms= 120 V. I'm using a 9-0-9 1 A step-down transformer, a full-wave bridge rectifier, a 1000 μF capacitor, and an 800 Ω resistance to convert the input voltage to 7.4 V approximately. ...
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Questions regarding this power module

I'm looking at this power IC module. I assume it's a buck converter. In that case, on page 16 of the datasheet, Equation 4.1, there's this formula: Rvout = 8.2 kΩ * TRIM. If TRIM is 5, then what would ...
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How is the voltage split?

Can anyone please explain how from +VO which is 5V and -Vo which is -5V, at the output VDDL is +6V and VEEL is -4V?
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Two GPIOs sharing the same hardware IO with 12V

I have a project where due to hardware restrictions I had to incorporate two MCU GPIOs under one wire. Both serve the input and output for a 12 V signal. While the output is being pulled low, the I/O ...
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500 mV p-p noise in two stage photodiode amplifier output

I have problem with power supply noise finding its way to op-amp output. Power line (+ and -) noise is 40 mV p-p. Is this due to poor pcb layout or poor filtering and what to do to make it better. I ...
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Need to change output voltage on MIC5891 driver

I have an LED control panel that uses the MIC5891 driver. I measured the VBB load voltage at 9.05 V, however, the outputs (1 through 8) all register at 1.96 V. What could be controlling this output ...
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2 answers
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STM32F078 I/O voltages

I'm working on a project right now and I'm building a schematic using the STM32F078. It's 1.8V. I know it has the analog/digital separate power supply of 3.6V max which on the data sheet is called ...
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Operational amplifier using power supply current as output [closed]

I have come across a circuit (I am not allowed to share it) with an opamp that uses a special output. The opamp's output is loaded with a resistor and has no other connection. It is the current drawn ...
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How to check output voltages?

I'm attempting to repair a Dell P2210 PC monitor. I've traced the fault to a faulty diode on the power supply board. As part of the repair I would like to check the output voltages. The service manual ...
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1 answer
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Converting current sources to voltage sources

Are the circuits in the figure equivalent?
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1 answer
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Designing a system with desired transfer function

Suppose we have a transfer function H(s) = 1/s+1. Is there a general method by which using electric components we can construct such a system?
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How does the common emitter configuration offer higher output impedance?

I know that the base-collector region is reverse biased and because of that it offers high resistance but it is the resistance due to biasing. In a video, the person was explaining the hybrid-pi model ...
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1 answer
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Trying to determine kWh used to run a pump on hydronic boiler

Pump is BA Armstrong CV 60, HP 1/12 , RPM 1725, VOLTS 115, AMPS 2.3 SERIAL # 7802
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Dual LED Configuration [closed]

I'm looking for a dual color red/green LED that is not common-anode, not common-cathode, but common anode-cathode (anode of one LED shares a pin with the cathode of the other LED). Can anyone list a ...
2 votes
1 answer
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VERILOG: why Xilinx AXI Slave declares all output signal as a wires and not reg?

I am reading the code for an AXI Slave provided by Xilinx (here below). I am wondering why they declare all outputs as wire and then assign them to an internal ...
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Power Supply Module Internal Trimmer circuit / Remote Programming Resistor Value?

I am looking to incorporate a 45V supply into a design. These PFE1000-48V supplies have a trimming ability to get +/- 20%, based on +/- 20% variable resistor. I am trying to confirm what this resistor ...
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Is a pull-up on open drain required when output is not used?

On a LTC3886-1 I can read this: I see that all open-drain outputs are tied to VDD on the following application schematics: Is there a reason why pull-ups seem required when the output is not used?
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Design with IC ADP5091 for energy harvesting in Proteus

I want to design this IC ADP5091 using Proteus. But I'm still a newbie and not much understand about this software and this IC. Can anyone help me? Is it right I'm doing this simulation circuit? ...
3 votes
1 answer
809 views

Headphone output - what is the function of these resistors going to ground between the decoupling capacitors and headphones

The Korg Monotron Duo synth uses the TPA6111A2 headphone amp. The circuit they use is largely the same as the one from the datasheet - except for R78, the 470ohm resistor going to ground right after ...
2 votes
1 answer
107 views

Digital buffer/driver (74LVC1G07) not outputting signal. MIDI output circuit

I am expericing difficulties with a simple MIDI output circuit. I have checked the input of the buffer and signal is there. However, there is not signal at ouput. . At first I thought that I blew up ...
4 votes
2 answers
317 views

The output amplitude of the C class amplifier I designed has a larger amplitude than the voltage source. How did this happen?

I designed a class C amplifier. I used a signal generator for the input signal. For the resonance circuit, I used a 3.3uH coil and a 480pF capacitor. The transistor is BC547-C. The resonance ...
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Sensor output resistance

I want to design a circuit using a Hall sensor (reference is SS49E, see datasheet). I want to size the output resistance of the sensor. The block diagram of the sensor is: The output current of the ...
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1 vote
1 answer
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VOH vs CMOS VOH

I'm new to circuit design. I'm trying to design a clock for a circuit containing 8 SPI to CAN devices. However, I'm not sure if it's possible with a single clock (perhaps this reference). As I'm not ...
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555 timer emits tone regardless of reset value

I made a microcontroller circuit on a PCB and I attached a typical timer circuit to it. The IC of the timer is an 8-pin DIP texas instruments NE555 Resistors are 5% tolerance. Output capacitor is ...
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2 answers
166 views

ADC output and voltage resolution question

I've made an attempt at this question, but the answer was wrong. Could someone please tell me where I was wrong in my calculation?
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1 answer
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Mathematical function a of an integrator in series with a non inverting op amp

I am trying to understand the circuit given below so I can make a mathematical model of it. The circuit consists of an integrator with a reference (offset) voltage and a non inverting op amp ...
4 votes
4 answers
708 views

Why do you suppress the input when finding the output impedance of an opamp circuit?

In most derivations of the output impedance of an (non-ideal) non-inverting opamp circuit, the input terminal is grounded (e.g. page 5/6 here or page 76 here). It also seems to be a common procedure ...
1 vote
3 answers
242 views

Discrete headphone amplifier output stage

What is the role of R13? I tried simulating this circuit using the Falstad simulator and removing it changed nothing. It is a circuit from Small Signal Audio Design by Douglas Self, second edition.
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323 views

Microcontroller 24V digital output

For a microcontroller generating a 20mA industrial digital output. What kind of setup is best? I'm considering: Microcontroller pin driving a low current N-FET to pull a 24V signal to ground. But ...
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Why is the output of this instrumentation amplifier not constant?

So here's the circuit and output voltage, the model is AD620: So according to theory (Vout = 49400/49400 +1)*(2-1) ) i should obtain 2V as the output voltage. Well what i got in LTSpice was a value ...
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LDO Outputs wrong voltage

I am working with a very low profile LDO, TCR5RG18A and I'm having issues at the regulators output. It's outputting 0.9V which is half its nominated value (nominal value = 1.8V) The LDO is operated at ...
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Capacitive load in inverter

I'm trying to understand the effect of a capacitive load at the output of an inverter. And how does it affect the output signal when this capacitive load is high and when it is low? Could anybody ...
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1 answer
125 views

Headphones on a line output (vs. headphones output)

I'm designing a device using a DAC (TI PCM 2704 like this one to be precise,) and optionally a headphones amplifier. I noticed that connecting (32 Ohms, closed-back Beyerdynamic) headphones to the ...
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2 answers
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Output state of the AM26LS32AIDR

We are using AM26LS32AIDR in our design, as per the datasheet when input is open/floating, output should be high, but the output is in low state. We are unable to trace out the issue. We followed the ...
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Output of filter is a pulse sequence

Like I have been advised in this question, I revised and updated the circuit to a more workable model, but at the end Im getting this output(the blue is the input and the red is the amplified and ...
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BJT common emitter output conductance

I constructed in multisim a common emitter circuit from the following diagram where the lower Keithley is used to supply VBE and the upper Keithley is used to supply VCE. I obtained the IC- VCE ...
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MM74C933N Output-enabled pin

Studying the datasheet of the MM74C922N 4x4 matrix keypad and I am lost on what the output-enabled pin does, its function, and why it is needed. Any help is appreciated.
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Voltage across capacitor measured in parallel, why not showing Vc?

I am trying to understand something and missing something. In a low pass RC filter, the output is connected in parallel with the capacitor, right, and is phase shifted, because the current in a RC ...
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