Automotive voltage tester schematic

Description: This is a simple spanniningszoeker that is very suitable for car, for connection of alarm systems, handsfree kits, radios, etc. At rest, the yellow LED because the path of least resistance. If the probe with a positive or negative pole connected is coming and the red or green and yellow LED light goes out. The yellow LED also serves as a check or put pressure on the circuit state. More: The circuit has a 12 V power supply just that the car is tapped. The best you can do with a cord with a cigarette lighter plug on it. The housing of the tester itself, for example the case of a standard voltage tester.

The described circuit functions as a voltage tester, specifically designed for automotive applications. It is capable of detecting the presence of voltage in various automotive systems, such as alarm systems, hands-free kits, and radios. The circuit operates on a 12V power supply, which is typically sourced from the vehicle's electrical system. A practical method for powering the circuit is to use a cord with a cigarette lighter plug, allowing for easy connection to the vehicle's power source.

The circuit includes three light-emitting diodes (LEDs), which provide visual feedback regarding the voltage status detected by the circuit. The yellow LED serves as an indicator of the circuit's operational state. When the circuit is at rest, this LED illuminates due to the path of least resistance. Upon connecting the probe to a positive or negative voltage source, either the red or green LED will light up, indicating the presence of voltage and effectively signaling the user that the circuit is active.

Resistors R1 and R2, both rated at 680 ohms, are employed to limit the current flowing through the LEDs, ensuring that they operate within safe limits and prolonging their lifespan. The diodes D1 and D2, specified as 1N4148, are used for signal rectification and protection within the circuit. These diodes help to prevent reverse polarity connections that could damage the circuit components.

The housing of the tester can be constructed from a standard voltage tester case, which provides a sturdy and portable enclosure for the circuit. This design not only ensures the durability of the tester but also facilitates ease of use in automotive environments. Overall, this simple spanniningszoeker is an effective tool for automotive technicians and enthusiasts alike, enabling quick and reliable voltage detection in various applications.This is a simple spanniningszoeker that is very suitable for car, for connection of alarm systems, handsfree kits, radios, etc. At rest, the yellow LED because the path of least resistance. If the probe with a positive or negative pole connected is coming and the red or green and yellow LED light goes out.

The yellow LED also serves as a check or put pressure on the circuit state. The circuit has a 12 V power supply just that the car is tapped. The best you can do with a cord with a cigarette lighter plug on it. The housing of the tester itself, for example the case of a standard voltage tester. R1, R2 = 680 ? D1, D2 = 1N4148 D3-D5 = LED, yellow, green, red