Timeline for Circuit simulation is not functioning properly
Current License: CC BY-SA 4.0
18 events
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| May 20 at 19:23 | history | edited | Boldumus | CC BY-SA 4.0 |
Added some missing information in the post, clarified image names
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| May 20 at 19:17 | comment | added | Boldumus | 3-The transistor base out is the voltage (and current)that goes into the transistor base. 4-Unfortunately, I've tried contacting the lab where I borrowed the parts but to no avail. Since I don't have them currently, I can't answer this question. 5-You are right, it is indeed a 100-ohm resistor. | |
| May 20 at 19:11 | comment | added | Boldumus | Hello. The material I used for the construction of the circuit is no longer in my possession, as it was lent to me for the duration of my project class, but I had to return it and am left with only pictures. I indeed used the CD40106B on the breadboard, not in the simulation, since it was the only inverting Schmitt trigger the software offered. I understand this can create issues with the simulation. Sorry for the confusion, the caption for this image was meant to be "oscillator out," and it’s connected to the cathode of diode from the oscillator module. | |
| May 20 at 16:22 | vote | accept | Boldumus | ||
| May 19 at 4:54 | answer | added | Fabio Barone | timeline score: 2 | |
| May 19 at 1:58 | comment | added | Fabio Barone | Question 5: please check the resistor connected to the collector of the 2N3904 on the proto-board, are you sure it is 1k and not 100r? (The photo is not clear enough). | |
| May 19 at 1:49 | comment | added | Fabio Barone | Question 4: What are the diodes you used in the proto-board? They seem to be different types. | |
| May 19 at 1:24 | comment | added | Fabio Barone | Question 2 re: photo of scope marked "Oscilloscope out". Which pin of the Schmitt-trigger is this on, the input or output? Question 3 re: photo of scope marked "transistor base out". Is this the voltage at the base of the NPN transistor? Are both of these photos with, or without, the 1uF polarised capacitor installed? | |
| May 19 at 1:05 | comment | added | Fabio Barone | Is the Schmitt-trigger inverter you used on the prototyping board a CD40106B (as per the question), or 74HC14 as per your comment? This is important, compared to the CD40106B, the 74HC14 is much faster, has different trip thresholds, has lower output resistance, and its power supply voltage is limited to 6V maximum. | |
| May 18 at 14:28 | comment | added | Finbarr | Unused CMOS inputs always need to be tied to GND or Vdd otherwise they can float to a state where both output transistors turn on and pass a lot of current from the supply. As the inputs are high impedance this can turn into oscillations. | |
| May 17 at 23:07 | answer | added | John Birckhead | timeline score: 1 | |
| May 17 at 21:31 | history | edited | JYelton | CC BY-SA 4.0 |
Spelling/capitalization
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| May 17 at 20:50 | comment | added | Boldumus | Indeed, all other entries of the schmitt trigger have been connected to ground. This is something I did in the breadboard version to remove some noise in the oscillation caused by the other inverters entering into oscillation (this is my theory at least, but whatever the case may be, connecting the other entries to the ground caused the noise I was getting to stop). Anyhow, I've tried to remove the grounds on the other entries and the same problem still happens. I have no idea what could even be pumping the 111mA into the chip. I thought it could have been the transistor or something, but no. | |
| May 17 at 20:41 | comment | added | Finbarr | Those error messages would suggest you've got the outputs of the schmitt trigger IC connected to GND or Vcc.. Are you sure it's all been entered correctly? | |
| May 17 at 17:49 | history | edited | Boldumus | CC BY-SA 4.0 |
added 110 characters in body
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| May 17 at 17:26 | comment | added | Boldumus | I managed to make a more functionnal version of the circuit on the falstab simulator. I still am having issues with the oscillator signals. The waveform that comes out of the oscillator is not the same as what I got experimentally and I am not totally sure why. The tension at the base of the transistor is also negative, and I have no idea why, and I am very confused towards why the rest of the simulation still seemingly works. Here is the simulation | |
| May 17 at 16:04 | comment | added | Boldumus | Oh and I forgot to mention, I know the parts used in the tinkercad simulation are not the same as the ones used in the actual circuit. This is because I was limited in terms of part options on the software. The actual circuit ran on 9V, whilst the simulated circuit runs on 5V, due to the limitation of the 74HC14 inverting schmitt trigger. For the same reason, I was unable to add a 100W speaker and simply used a 8k Ohm resistor and I was unable to add a 5W 50 Ohm resistor so I used a 50k Ohm resistor. All that matters on the simulation is that the oscilloscope wave parton look the same. | |
| May 17 at 15:59 | history | asked | Boldumus | CC BY-SA 4.0 |