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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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Presentation Transcript

### Simple Amplifier Circuit

Beth Keswani, Les Murphy, and Steve Wilt

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

• 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

Op amp

Resistors

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

• 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.

• This is using a 4Ω resistor.

• The gain is 154.

• This is using the 8Ω resistor.

• The gain is 205.

• This is using the 16Ω resistor.

• The gain is 170.

• This is using the 32Ω resistor.

• The gain is 189.

• 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 4Ω resistor

Percent Error is 54%

Using the 8Ω resistor

Percent Error is 2.5%

Using the 16Ω resistor

Percent Error is 15%

Using the 32Ω resistor

Percent Error is 16%