Modular Synthesizer Design

flux

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Below is a table listing the typical components you'll need to assemble the schematic with a Wheatstone bridge, a gauge (galga extensiométrica), and an op amp for signal amplification:

Table

DesignatorComponentDescription
R1ResistorFixed resistor for one branch of the Wheatstone bridge
R2ResistorFixed resistor for the opposite branch of the Wheatstone bridge
R3ResistorFixed resistor in the remaining branch of the Wheatstone bridge
R_GGalga ExtensiométricaStrain gauge acting as the variable resistor in the Wheatstone bridge
U1LM358 (Op Amp)Operational amplifier to amplify the bridge's differential voltage
R_fResistorFeedback resistor for U1 to set the amplifier gain, as part of the feedback network (defines gain: A=1+fracRfRg\Large A = 1 + \\frac{R_f}{R_g})
R_g (gain)ResistorResistor from the inverting input of U1 to ground to complete the gain network
C1100nF CapacitorDecoupling capacitor placed near U1 for power-supply stability
V+ SupplyPower SupplyVoltage source for the bridge and op amp (e.g., +5V or as required by your design)
GNDGroundCommon reference node for the circuit
You can adjust specific resistor and capacitor values based on your desired sensitivity and gain settings. This list serves as a basic starting point for the design. Let me know if you would like to add or modify any component details!
385 days
marlonacosta

marlonacosta

podemos usar resistencias de 1k
385 days

flux

0:21

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Sí, podemos utilizar resistencias de 1kΩ para las ramas fijas del puente de Wheatstone. Utilizar resistencias de igual valor ayuda a equilibrar el puente y mejorar la precisión en la medición de la galga extensiométrica.
Recuerda también que para la red de ganancia del op amp:
  • La ganancia en una configuración diferencial simple se define como:
    A=1+RfRg\Large A = 1 + \frac{R_f}{R_g}
  • Si utilizas 1kΩ tanto para el resistor de realimentación R_f como para el resistor de ganancia R_g, la ganancia resultante será:
    A=1+1kΩ1kΩ=2\Large A = 1 + \frac{1kΩ}{1kΩ} = 2
Si la ganancia de 2 es adecuada para tu aplicación, entonces puedes mantener 1kΩ para ambos. Si necesitas una mayor amplificación, deberás ajustar estos valores (por ejemplo, para obtener A=10, podrías usar R_f = 9kΩ y R_g = 1kΩ).
¿Te gustaría ajustar o profundizar en alguna otra parte del diseño?
Use 1kΩ resistors
Calculate op amp gain
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