Simple amplifier circuit
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Simple Amplifier Circuit. Beth Keswani, Les Murphy, and Steve Wilt. What is an amplifier?. An amplifier is an electronic device that enlarges or extends power, current, or voltage. We are using the amplifier for sound. . Amplifiers In Action.

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Simple amplifier circuit l.jpg

Simple Amplifier Circuit

Beth Keswani, Les Murphy, and Steve Wilt

What is an amplifier l.jpg
What is an amplifier?

  • An amplifier is an electronic device that enlarges or extends power, current, or voltage. We are using the amplifier for sound.

Amplifiers in action l.jpg
Amplifiers In Action

  • Audio amplifiers are used in stereo systems, car systems, and personal radios. Bands also use amplifiers to create a louder sound.

I have an amp in me!

Whoa! That’s loud!!!

This is Les

What do we need l.jpg


Op amp


Wave generator for voltage input

Variable Resistor

What Do We Need?

  • Op Amp- LM386

  • Variable Resistor- 102

  • Capacitors- 10μF and 250μF

  • Voltage Input- 1KHz

  • Low Impedence Resistor- 4Ω, 8Ω, 16Ω, 32Ω

How to read the results l.jpg
How to Read the Results

  • The yellow wave is the output.

  • The blue wave is the input.

  • We can tell this worked because there is a gain, so it shows that the amplitude was increased.

  • To calculate the gain, we used

    channel 1 (yellow wave) peak to peak

    channel 2 (blue wave) peak to peak.

The tektronic results are in l.jpg
The Tektronic Results Are In…

  • This is using a 4Ω resistor.

  • The gain is 154.

More fun graphs l.jpg
More Fun Graphs…

  • This is using the 8Ω resistor.

  • The gain is 205.

Keep the fun coming l.jpg
Keep The Fun Coming…

  • This is using the 16Ω resistor.

  • The gain is 170.

Aw the fun is almost over l.jpg
Aw…the fun is almost over

  • This is using the 32Ω resistor.

  • The gain is 189.

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PSpice and Tektronic Team Up!

  • These results will show the PSpice results and the Tektronic results compared together. Each PSpice result includes a graph similar to the Tektronic results and also a graph showing the frequency.

Using the 4 resistor l.jpg
Using the 4Ω resistor

Percent Error is 54%

Using the 8 resistor l.jpg
Using the 8Ω resistor

Percent Error is 2.5%

Using the 16 resistor l.jpg
Using the 16Ω resistor

Percent Error is 15%

Using the 32 resistor l.jpg
Using the 32Ω resistor

Percent Error is 16%