Electronics > Beginners

Everything goes wrong in my analog circuit

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Wimberleytech:
You need to break this thing into subcircuits and prove out each one alone rather than building the whole thing and throw up your hands when it does not work.  Divide and conquer.

CatalinaWOW:
My local stores are non existent, so your bad store is better than mine.  I have to order everything on line.  You say Digikey and Mouser are out for you.  Are there any online options?  Ebay or Alibaba or ?.  Another thing to try is to see if your electronics store can order or perhaps a local school or university.  I know that regulations in some places make things harder, but there is usually some way to make things happen.

Eldi4:

--- Quote from: Audioguru on March 10, 2019, 01:44:00 am ---The TL08x opamps have the "Opamp Phase Inversion Problem" which is why they need a negative supply in addition to its positive supply. If an input voltage gets within a few volts from its negative supply voltage (ground in this circuit) then its output suddenly goes as high as it can. The inputs in this circuit always go near ground so the problem occurs often.

--- End quote ---

Wow, this is new to me, thanks for sharing the knowledge!



--- Quote from: Wimberleytech on March 10, 2019, 03:02:05 am ---Try this

You will need to make your own autogenerated model for the simulation...using the model file I provided.

--- End quote ---

Using your schematic
By changing the resistor on integral output to 20k, the amplitude is getting bigger, and by changing the supply voltage to 12V the output swing is getting better, using 5V will give me output swing of (1.7V to 3.3V) and by using 12V it gives (1.8V to 10.2V), well probably i will use a higher supply voltage for my TL084.

but when i tried to rebuild my trianglewave generator it gives me square wave output instead of triangle  :-DD

Thanks a lot for your suggestion


--- Quote from: CatalinaWOW on March 10, 2019, 04:59:44 am ---My local stores are non existent, so your bad store is better than mine.  I have to order everything on line.  You say Digikey and Mouser are out for you.  Are there any online options?  Ebay or Alibaba or ?.  Another thing to try is to see if your electronics store can order or perhaps a local school or university.  I know that regulations in some places make things harder, but there is usually some way to make things happen.

--- End quote ---

Yep but you have more complete component to order, from the oldest to the newest, while mine are only old component. There are some local online stores, which is better than local stores, but it is not as complete as digikey or mouser, and sometimes the part are extremely costly compared to digikey or mouser,
I can't order on ebay, but i can order on aliexpress, but the shipping take a loong time (1 month), because i always take the free shipping option. You know, i don't want to buy a thing when the shipping is more costlier than the cost of the order itself, even when the shipping is fast  :-DD.

Wimberleytech:

--- Quote ---
but when i tried to rebuild my trianglewave generator it gives me square wave output instead of triangle  :-DD


--- End quote ---
What frequency?

Eldi4:
Ahh... never mind the Vref is swapped, it's supposed to be on non-inverting input of hysteresis and on inverting input of integrative but on my schematic it's swapped, the frequency is around 500Hz, don't really know how to read frequency on LTSpice, i'm so noob on LTSpice  :-[

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