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Load Cell Signal Conditioning Circuit with Dual Op-Amp and PNP Transistor

Image of Load Cell Signal Conditioning Circuit with Dual Op-Amp and PNP Transistor

Circuit Documentation

Summary of the Circuit

The circuit in question appears to be an analog signal processing circuit that utilizes a PNP transistor, resistors, tantalum capacitors, a load cell, and a dual operational amplifier (TLC272CP). The circuit may be designed for measuring and amplifying signals from the load cell, with the PNP transistor acting as a switch or amplifier. The capacitors could be used for filtering or stabilizing the voltage supply. The TLC272CP op-amps are likely used for signal conditioning, such as amplification or filtering. The multimeter suggests that the circuit is set up for testing or measurement purposes. The presence of two DC power sources indicates that different parts of the circuit may require separate voltage levels.

Component List

PNP Transistor (EBC)

  • A PNP transistor with emitter, base, and collector pins.

Resistor

  • A resistor with a resistance of 220 Ohms.

Tantalum Capacitor

  • Two tantalum capacitors with a capacitance of 1 nanofarad (1e-9 Farads).

GND (Ground)

  • A ground reference point in the circuit.

DC Power Source

  • Two DC power sources, each with a ground and a positive voltage output.

Multimeter

  • A multimeter with common (COM), voltage (V), and current (A) measurement capabilities.

TLC272CP

  • Two TLC272CP dual operational amplifiers, each with pins for output, inverting input, non-inverting input, ground (GND), and power supply (VCC).

Load Cell - Red/white/black/green

  • A load cell with excitation positive (E+), amplifier negative (A-), excitation negative (E-), and amplifier positive (A+) pins.

Comments

  • Three comment components, which are likely placeholders or notes for the circuit designer.

Wiring Details

PNP Transistor (EBC)

  • Emitter connected to the positive side of a DC power source, a resistor, and the non-inverting input (IN 2+) of a TLC272CP op-amp.
  • Base connected to another resistor and the inverting input (IN 1-) of a different TLC272CP op-amp.
  • Collector connected to the inverting input (IN 2-) of a TLC272CP op-amp and the amplifier positive (A+) of the load cell.

Resistor

  • One side (pin1) connected to the base of the PNP transistor and the inverting input (IN 1-) of a TLC272CP op-amp.
  • The other side (pin2) connected to the emitter of the PNP transistor, the non-inverting input (IN 2+) of a TLC272CP op-amp, and the positive side of a DC power source.

Tantalum Capacitor

  • One capacitor with the positive pin connected to the non-inverting input (IN 2+) of a TLC272CP op-amp and the positive side of a DC power source. The negative pin is connected to ground.
  • Another capacitor with the negative pin connected to ground and the positive pin connected to the non-inverting input (IN 2+) of a TLC272CP op-amp.

GND (Ground)

  • Connected to the ground pins of the TLC272CP op-amps, the negative pins of the tantalum capacitors, the excitation negative (E-) of the load cell, the common (COM) of the multimeter, and the ground side of both DC power sources.

DC Power Source

  • One power source with the positive output connected to the emitter of the PNP transistor, a resistor, and a tantalum capacitor. The ground output is connected to ground.
  • Another power source with the positive output connected to the ground (GND) of a TLC272CP op-amp. The ground output is connected to ground.

Multimeter

  • The common (COM) connected to ground.
  • The voltage (V) measurement connected to the power supply (VCC) of a TLC272CP op-amp.

TLC272CP

  • One TLC272CP with the inverting input (IN 1-) connected to the base of the PNP transistor and a resistor. The non-inverting input (IN 2+) connected to the emitter of the PNP transistor, a resistor, and a tantalum capacitor. The ground (GND) connected to ground and the output (OUT 1) connected to the negative pin of a tantalum capacitor.
  • Another TLC272CP with the inverting input (IN 2-) connected to the collector of the PNP transistor and the amplifier negative (A-) of the load cell. The non-inverting input (IN 1+) connected to the excitation positive (E+) of the load cell. The power supply (VCC) connected to the voltage (V) measurement of the multimeter.

Load Cell - Red/white/black/green

  • Excitation positive (E+) connected to the non-inverting input (IN 1+) of a TLC272CP op-amp.
  • Amplifier negative (A-) connected to the inverting input (IN 2-) of a TLC272CP op-amp.
  • Excitation negative (E-) connected to ground.
  • Amplifier positive (A+) connected to the collector of the PNP transistor.

Documented Code

No code has been provided for the microcontrollers in the circuit. If there are any microcontrollers or programmable devices in the circuit, their code would be documented in this section. Since no code is available, this section remains empty.