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10 votes

AD620 in Proteus: timestep too small

Try this. System --> Set Animation Options --> SPICE Options Change "Default Settings" into "Settings for Better Convergence" and load it.
Gon99999's user avatar
  • 101
9 votes

What's wrong with this circuit?

Problems: 1 and 2. Short circuits between V+ and V-. 3, 4, 5 & 6. Short circuits between inverter inputs and outputs. 7 and 8. LEDs with no current limiting resistors. It looks like you copied ...
Transistor's user avatar
  • 177k
9 votes
Accepted

What went wrong with this class A amplifier design?

You are forcibly feeding AC from AC source that is directly connected into transitor base, bypassing the DC bias resistors.
Justme's user avatar
  • 159k
8 votes
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Why doesn't my MOSFET work?

One problem that is immediately obvious from your schematic is that the arduino does not share a ground with your external circuit. Without such a common ground, (or some special circuitry) you cannot ...
Math Keeps Me Busy's user avatar
6 votes

DC voltmeter yields a value with 21% error

When a string of voltages does not add up to what you expect, you check each individual part to understand why. Vf for small Silicon diodes and Vbe near 1mA is around 0.65V. Note that just by ...
Tony Stewart EE75's user avatar
6 votes

How to cover vias with solder mask (solder resist) on Proteus

For you to cover the vias with the Solder Mask, you must disable the Guard Gap in the properties. For example, below, I drew the outline of the board and filled it with "DEFAULT" type vias. Next to ...
Cleisson's user avatar
6 votes
Accepted

LCD 16x4 is shifting the columns of the third and fourth lines

Not having the source of those libraries I can't tell you how to fix it, but I can help you understand the problem so you may be able to sort it out yourself. Here's a memory map for a typical 16x4 ...
Finbarr's user avatar
  • 5,836
6 votes

TL071 doesn't work like a generic op-amp

Firstly, you don't need to attach hierarchy module. This is used to edit the child sheet to turn the component into a module and attach subcircuits etc. Which can be useful when designing your own ...
MCG's user avatar
  • 12k
6 votes

What went wrong with this class A amplifier design?

What is the role of the input coupling capacitor? OP has neglected the input coupling capacitor (not shown in their schematic; let's tentatively call it C1). So it would be good to clarify what its ...
Circuit fantasist's user avatar
5 votes

Serial monitor not appearing

Normally the terminal window is shown by default when you simulate the circuit but if you don't see it you can click on Virtual Terminal in the Debug menu.
alexan_e's user avatar
  • 11.2k
5 votes

LED in series is not working in Proteus simulation

It may be because the voltage is too low. Red LED have a forward voltage of at least 1.7 V. So to power 4 LED in series you need at least $$4\cdot 1.7 V = 6.8 V$$ So if the simulator takes forward ...
Jiří Maier's user avatar
  • 1,294
5 votes

What is the problem in this op-amp oscillator that oscilloscope does not show any oscillations?

There is no feedback in your circuit. The op-amp output is only connected to the oscilloscope (note the missing dot).
Sim Son's user avatar
  • 2,803
5 votes
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How do I calculate THD?

So my problem is to find the rms value of each frequency component. I know the magnitude of each frequency component from this graph, but how can I convert this magnitude to rms value? Remember the ...
Rohat Kılıç's user avatar
4 votes

DC voltmeter yields a value with 21% error

The difference seems to be close to a ~ 0.7 V drop across the diode. Could that be the source of the error? Ideal diodes are almost always modeled as having a constant 0.7 V drop regardless of the ...
rtclark's user avatar
  • 344
4 votes

DC voltmeter yields a value with 21% error

It's pretty clear that the diode is accounting for (I assume) a simulated voltage reading in Proteus. I can't speak to how "ideal diode" applies to your simulator, as I don't have or use it. But ...
jonk's user avatar
  • 78.3k
4 votes

How to get size of PCB in Proteus

There's a mode called Dimension Mode. You can access this mode by clicking the button with a diagonal two-headed arrow symbol from the toolbar on the left: At this mode, if you draw a line, it will ...
Rohat Kılıç's user avatar
4 votes
Accepted

Beginner PIC question

Your loop takes 3 instruction cycles to execute. Not every instruction on the PIC takes exactly one instruction cycle. See Table 7-2 in the PIC16F84A datasheet. ...
Los Frijoles's user avatar
  • 2,252
4 votes
Accepted

Down counter using 4510 IC

Unfortunately the PE input to this counter is asynchronous. In other words it preloads the registers when it goes to a high level and is not synchronized with the clock. When the input to your 0 ...
RoyC's user avatar
  • 10.1k
4 votes
Accepted

How to calculate phase shift of a low-pass filter's output?

Well, we know that: $$\mathscr{H}\left(\text{s}\right):=\frac{\text{V}_\text{out}\left(\text{s}\right)}{\text{V}_\text{in}\left(\text{s}\right)}=\frac{ \displaystyle\frac{1}{\text{sC}}}{\displaystyle\...
Jan Eerland's user avatar
  • 7,989
4 votes

The circuit with 74HC138 is working, but with 74LS138 it is not, why?

The 74ALS138 device that you found was unable to drive the output LEDs is operating (more than likely) correctly - the output high drive current is only specified at 400 uA in the data sheet. ...
Andy aka's user avatar
  • 465k
4 votes
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Unable to generate AM wave using opamp log antiog multiplier

Your circuit idea might be flawed and I can't understand what your waveforms are in relationship to your circuit AND, your inputs into R4 and R5 don't appear to be sourced from anywhere so, start ...
Andy aka's user avatar
  • 465k
4 votes
Accepted

I am trying to make 3bit counter with an arbitrary sequence but it gets stuck in a loop (Proteus8)

Let me suggest some thoughts to consider. First off, let's look over the states you need to output: $$\begin{array}{c} \text{State}\\\\ {\begin{smallmatrix}\begin{array}{ccc} C & B & A\\\\ ...
jonk's user avatar
  • 78.3k
4 votes
Accepted

Digital logic design /circuit

The boolean expression A'BC+AB'C+ ABC' corresponds to the following K-Map: As you can see, there are no adjacent 1 values in the map, therefore the S.O.P expression above is in fact, the most ...
uriyabsc's user avatar
  • 493
4 votes

Why does the astable multivibrator using transistor not work when I use the same value of resistance for the collector of both the transistors?

You can usually cause the simulation to work okay if you use the initial conditions card, .IC, in your schematic project to set an unusual node voltage as a starting point. (You could also add a ...
jonk's user avatar
  • 78.3k
4 votes

Some of my LEDs managed to light up but the others just won't work no matter what I do, what could be the reason for this?

The GPIO pins for the lower LEDs are connected to GND.
PStechPaul's user avatar
  • 7,475
4 votes

How to find the hidden pin?

There is no problem. The STM32 you added in Proteus is not a module, it's the bare chip. Your other picture shows a module which contains an STM32 plus all the other components needed around it to ...
Justme's user avatar
  • 159k
4 votes

LED to the carry out pin of my 7483 IC doesn't glow in Proteus

This data sheet for a similar IC shows pin C0 as an input ("Carry Input"), and pin C4 as an output ("Carry Output&...
toolic's user avatar
  • 8,561
3 votes

How to simulate a PIC microcontroller using Proteus

If you are using Proteus Demonstration, they won´t run. In Proteus Demonstration you only can run Samples and change the code, but the schemmatic.
Rômulo's user avatar
  • 31
3 votes
Accepted

DC voltmeter yields a value with 21% error

The diode is not ideal. If you right click the diode and select "Display Model Help", it will show you the model parameters used for simulating the diode:
Chi's user avatar
  • 936
3 votes

RF Ground Stitching in Proteus Ares 8

Use Pads instead of Vias. Create a component with one pad called Ex: stitchingVia. Place as many as you want in the schematic. and connect them to GND. in the PCB part View the pad properties and ...
555's user avatar
  • 369

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