2194A4-12V Optoelectronics

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2194A4-12V application field and working principle

The 2194A4-12V belongs to the range of Panel Indicators, Pilot Lights. These products are configured to utilize either LED or incandescent bulbs to produce the desired illumination to indicate power status, etc. Primarily used in industrial, military, aviation and other commercial markets, they are available in horizontal or vertical orientation with several colors, sizes and prices.

Working principle

The 2194A4-12V unit is based on a voltage reference that switches an embedded LED or incandescent light source when a certain voltage is reached. This voltage is determined by the resistor, a normally open switch and the voltage regulator (LM2940). The resistor is connected to the voltage supply and constantly resists current in the circuit, regulating the voltage at the same time. When the switch is activated, the voltage is applied to the resistance network, and this produces a higher voltage in the circuit, creating the necessary conditions for LED or incandescent bulb to operate when the voltage reaches a certain level. To illustrate this concept, consider the following circuit: voltage source, resistor, switch and light source.

When the switch is on, current passes through the resistor R1, creating a voltage as determined by the ohm’s law. As this voltage is applied to the light source, the bulb lights up. To create a higher voltage within the circuit, another resistor R2 can be added. When voltage is applied to the resistor R2, the current will draw from the voltage supply, increasing the voltage within the circuit. This increases the power applied to the LED or the incandescent bulb, allowing for a brighter light.

Application field

The 2194A4-12V is mainly used in industrial, military, aviation and other commercial applications. It can operate either as a panel indicator or as a pilot light. The unit is designed to provide a visible indication of the power supply status, machine control, etc. Typically, for industrial applications, the 2194A4-12V is installed in the control panel and its LED or incandescent bulb illuminates in green, yellow, red or white. It’s also employed in complex machines to indicate the power status of several functions at the same time. Manufactured for a maximum voltage of 12V, the unit can be safely used in aviation and other safety-critical fields.

The unit has several configurations available. Most popular are the 12mm & 15mm edge-lit (horizontal/vertical) versions and the 6 mm black box type. Additionally, the unit features a range of lighting options, including LED, polarity protected LEDs, wire-leaded incandescent bulbs, LED assemblies with built-in voltage regulator, and photo-resistive LED modules. The 2194A4-12V is suitable to operate in a wide temperature range from -30 to 85 C.

Conclusion

The 2194A4-12V is a versatile and reliable Panel Indicators, Pilot Light that can be utilised for a broad range of commercial and industrial applications. It features a high-performance voltage regulator powered by an LED or incandescent bulb to provide the necessary illumination for various applications. This unit is designed to be operated in harsh environments and can be mounted in several orientations. Built for a maximum voltage of 12V, it’s suitable for use in aviation and other safety-critical systemsfields.

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