Single Supply

166

00:50:21

Single Supply Signal Amplification:
We are going to build a signal amplifier with a single power supply; four op amps, where one is used to create a fortified half‐supply, and the other three are used as three stages of amplification. We will use a 5V single‐supply for a set of four (MCP6004) op amps.  Use one the op amps in this package to create a steady 2.5V (A simple voltage divider with two ~10k resistors fortified by a voltage follower.) We are going to name this potential “signal ground”.  a.We will use the signal generator (1kHz sine, 50mVpp as the model for our input). We will connect the signal through a 100nF series coupling capacitor. The first stage of amplification is an inverting set‐up, with an input resistance of 100k and an amplification factor of 5. Connect the signal’s ground and the V+ of the amplifier to the “signal ground”. Since signal ground is connected to the scope’s common, observe the VDD and VSS with the scope (what do you see?). Check the output signal. 

published 6 years ago

fatcat2

6 years ago

I have never seen such a circuit with some sort of strange unity gain negative feedback. If you wanna amplify a signal, use an opamp inverting or non inverting amplifier. This is a buffer not an amplifier; current amplifier.

jxa3128

6 years ago

I am not done YET xD, thank you though

fatcat2

6 years ago

You're always welcome.

hurz

6 years ago

@jxa3128, you do the effort to create an virtual ground at 1.25V above the EC ground, but the nothing of your circuit does reference to it or does use it! You do not need this extra "ground".

jxa3128

6 years ago

Y'all I think i did it haha

fatcat2

6 years ago

Actually speaking, is this an amplifier or a sine to square convertor?

hurz

6 years ago

here we go, that easy http://everycircuit.com/circuit/5718594238021632

fatcat2

6 years ago

But why do want to amplify a clipped waveform? Better use a schmitt trigger?

hurz

6 years ago

overengineered !

fatcat2

6 years ago

Flawy.... Floppy.... One.... 😑

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