Electronics > Beginners
Please help me understand this circuit
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Zero999:

--- Quote from: Doctorandus_P on January 27, 2019, 08:13:52 am ---I've added an PNP transistor and a resistor to drain the 1mF capacitor when the switch opens.
I've also attached the project in KiCad format.
So instead of everybody re-drawing the whole thing you can take this project, modify it a bit and post a screenshot :)

KiCad is fully Free and Open Source Software. No hidden agenda's, no misty stealing of your intellectual property, no artificial limits on for example board size or number of pins. No limited time edition.

And it is being improved significantly every year. Do not believe a 2 year old review :)

--- End quote ---
I haven't used KiCAD for a couple of years. The last time was a total fail. I tried to open a project posted by someone else here and it mangled it badly because the libraries on my install were different to theirs.

Original

https://www.eevblog.com/forum/beginners/best-way-to-amplify-a-sine-wave-without-distorsion/msg1125940/#msg1125940

What it looked like when I opened it.

https://www.eevblog.com/forum/beginners/best-way-to-amplify-a-sine-wave-without-distorsion/msg1126604/#msg1126604

I don't have KiCAD installed on this machine and will try opening your attachments later.
Moriambar:

--- Quote from: MarkF on January 27, 2019, 07:32:08 am ---If you use a SPDT switch, you can control both the turn on time (via R1) and the turn off time (via R2).
Maybe start with R1=10K, R2=1K and C1=100nF.

   OR

Just add a resistor in parallel with the capacitor in your original circuit. 
You would need to keep in mind the series current when the switch is on if you do this.


--- End quote ---

thanks, the spdt switch was actually one of the original ideas, but I was trying to build it without it, something more "automatic" in order to have a temporary pushbutton instead of a proper switch.

Nice idea though
Moriambar:

--- Quote from: Doctorandus_P on January 27, 2019, 08:13:52 am ---I've added an PNP transistor and a resistor to drain the 1mF capacitor when the switch opens.
I've also attached the project in KiCad format.
So instead of everybody re-drawing the whole thing you can take this project, modify it a bit and post a screenshot :)

KiCad is fully Free and Open Source Software. No hidden agenda's, no misty stealing of your intellectual property, no artificial limits on for example board size or number of pins. No limited time edition.

And it is being improved significantly every year. Do not believe a 2 year old review :)

--- End quote ---

thanks, I'll try this as soon as I can
Doctorandus_P:

--- Quote from: Zero999 on January 27, 2019, 10:10:08 am ---I haven't used KiCAD for a couple of years. The last time was a total fail. I tried to open a project posted by someone else here and it mangled it badly because the libraries on my install were different to theirs.

I don't have KiCAD installed on this machine and will try opening your attachments later.

--- End quote ---

KiCad has had it's share of bumps but inconsistencies are getting less.
KiCad has now reached V5 late last year which was a very big improvement, but as a consequence incompatibilities with some hardware have turned up, wich is why it's been bumped to V5.0.2 pretty fast after V5.0.

The little project above is made with only standard symbols from the library (which has expanded enourmously in the last few years, Even DigiKey is making libraries for KiCad).
https://www.digikey.com/en/resources/design-tools/kicad

In the zipped file there is a [projectname]-cache.lib in which the symbols which are used in the schematic are cached. So as long as you distribute this file with your project, the mess you showed should not happen anymore.
MarkF:
Just a note to forgo any confusion.
I use: 
   mF == milliF == 10-3
   uF == microF == 10-6
   nF == nanoF  == 10-9
   pF == picoF  == 10-12

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