345__LINEAR POTENTIOMETER TO LOGARITHMIC OR ANTILOG.

#1 · January 7, 2024, 2:57 pm

Quote from Defran on January 7, 2024, 2:57 pm

345_LINEAR POTENTIOMETER TO LOGARITHMIC, THREE STRUCTURES AND ITS DYNAMIC CURVES (Simulide R2116 or higher.)

This is a conversion test from a linear potentiometer to LOGARITHMIC, ANTILOGATITHMIC or BOTH at the same time. This type of potentiometers is manufactured in reality with a carbon track with a non-linear concentration following a mathematical law, in our case with a variation logarithmic, which gives a resistivity proportional to the concentration (More concentration - lower resistivity). These are potentiometers for specific applications, for example in audio due to the logarithmic behavior of hearing.

SCHEME:

In our example the conversion is done by adding resistors with a value proportional to that of the potentiometer connected between its cursor and GND or 5V, these resistors have a variable resistor in series for a certain modification of the curve and a switch to switch between LINEAR and NON-LINEAR operation.

The oscilloscope shows the curves of each type. We obtain the curves by simulating the rotation of the potentiometers using a DC-MOTOR whose rotor is linked simultaneously to the three axes of the potentiometers. The rotation speed is controlled by the motor feeding. To be able to see the curves well, a power supply of around 2 volts is appropriate in conjunction with the configuration of the oscilloscope.

SUBCIRCUITS:

This example integrates several subcircuits located in the "data" folder into the ZIP attached. This folder must always be next to the "sim1" scheme so that it can be executed. A subcircuit is a “custom” circuit that accumulates a set of Simulide base components (primitive function) to obtain a new or an adapted function. These subcircuits are treated by Simulide as another component of its own structure. User can create his own subcircuits or use the ones published here in your own designs once the procedure is known, explained in detail in the Simulide tutorials: https://simulide.com/p/subcircuits/

* Communication with the author: Simulide/User/Messages/Defran

345_LINEAR POTENTIOMETER TO LOGARITHMIC, THREE STRUCTURES AND ITS DYNAMIC CURVES (Simulide R2116 or higher.)

This is a conversion test from a linear potentiometer to LOGARITHMIC, ANTILOGATITHMIC or BOTH at the same time. This type of potentiometers is manufactured in reality with a carbon track with a non-linear concentration following a mathematical law, in our case with a variation logarithmic, which gives a resistivity proportional to the concentration (More concentration - lower resistivity). These are potentiometers for specific applications, for example in audio due to the logarithmic behavior of hearing.

SCHEME:

In our example the conversion is done by adding resistors with a value proportional to that of the potentiometer connected between its cursor and GND or 5V, these resistors have a variable resistor in series for a certain modification of the curve and a switch to switch between LINEAR and NON-LINEAR operation.

The oscilloscope shows the curves of each type. We obtain the curves by simulating the rotation of the potentiometers using a DC-MOTOR whose rotor is linked simultaneously to the three axes of the potentiometers. The rotation speed is controlled by the motor feeding. To be able to see the curves well, a power supply of around 2 volts is appropriate in conjunction with the configuration of the oscilloscope.

SUBCIRCUITS:

This example integrates several subcircuits located in the "data" folder into the ZIP attached. This folder must always be next to the "sim1" scheme so that it can be executed. A subcircuit is a “custom” circuit that accumulates a set of Simulide base components (primitive function) to obtain a new or an adapted function. These subcircuits are treated by Simulide as another component of its own structure. User can create his own subcircuits or use the ones published here in your own designs once the procedure is known, explained in detail in the Simulide tutorials: https://simulide.com/p/subcircuits/

* Communication with the author: Simulide/User/Messages/Defran

Uploaded files:

345_LINEAR-POTENTIOMETER-TO-LOGARITHMIC_ANTILOG.zip

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