Power Amplifier

Description

The Power Amplifier allows you to drive loads with ±10 V and up to 1 A current.

• Utilizes internal feedback for accurate AC waveforms and DC levels.
• Can provide a steady, linearly-controlled DC output for driving loads like DC motors, and precise AC waveforms for driving things like speakers.
• Current-limited to protect against overload and shorting.
• Current monitor function allows you to log real-time load current with any Vernier interface.
• Class A-B Push-Pull Amplifier provides low distortion with good efficiency.
• Supports LabQuest as a standalone device or a computer with Logger Pro 3.8 or newer and a LabQuest, LabPro, or SensorDAQ interface.

Specifications

Technical Details of Power Amplifier Operation

• LabQuest Audio (3.5 mm connector) input
• DC coupled between tip and sleeve of 3-conductor connector
• Frequency range: DC to 15 kHz.
• Overall gain: 10X
• Input impedance: 10 kΩ.
• If using this input with a source other than LabQuest, use a mono cable so the PWM input on the ring will be grounded.

LabQuest Pulse Width Modulation Input

• Pulse Width Modulation (PWM) signal input between ring and sleeve of 3.5 mm connector.
• This is used for producing a DC offset or pure DC output with a LabQuest.
• This input is designed for the LabQuest PWM output only.

BTA Analog Input

• DC coupled and has a total gain of 2X to the output.
• Input impedance is 50 kΩ.
• Maximum input ±12 V without damage.
• This input is on pin 1, or the yellow wire, of the BTA Cable

BTA Current Sensing

• There is a 0.1 Ω resistor between the black terminal and ground. Current measurements are based on the voltage drop across this resistor.

Experiments and Lab Ideas

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