Electronics Forum (Circuits, Projects and Microcontrollers)

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Message History

Noisy on amp output12 mins

How do I get rid of 50mV of crap on the output of my op amp amplifier?

I have a 220uf capacitor and a 0.1uf capacitor across the supply rails.

I am using an LM358 device.

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Op amp gain12 mins

I am correct in saying Rf divided by R1 will give me the gain of the op amp but if I know the gain I need, what is the equation for that?

How do I calculate for a specific gain?

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logic behind conversion method of single ended to differential filter7 hrs

Hello There is this manual and a guidance I got regarding how to convert a single endded filter into differential one.
Two questions:
1.Is there some more theoretical explanatio I could follow regarding how this method was developed?

2.also there is the input and output impedance which is missing.
How do I make sure my 50 ohm input impedance of the filter st...

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Circuit sensitivity14 hrs

I built this circuit and i get ~200mV signal from the output of the first op amp if i blow onto the mic but almost nothing when i talk or play music from my phone into the mic, I don't know what the problem is, can anyone shine some light on this issue please?

Could it be i need a second op amp in there for more amplification? I am using an LM358 as i have an abundance ...

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