zener diode tester schematic
The Zener diode tester circuit comprises several essential components, including resistors, transistors, and switches, which work together to facilitate accurate measurements of the Zener diode's breakdown voltage. The core of the circuit is the Zener diode, which is connected in parallel with a voltmeter to enable direct voltage readings. When switch S1 is closed, current flows through the circuit, allowing the Zener diode to operate in its breakdown region.
Transistor T1 plays a crucial role in the circuit by regulating the current through the Zener diode. The base of T1 receives voltage from the power supply through resistor R4, which ensures that T1 remains in the 'on' state, allowing current to flow. The current through the Zener diode is influenced by the base-emitter voltage of transistor Q2, which is in turn affected by the value of resistor R1. This relationship allows for precise control of the Zener current, making it possible to measure different current levels accurately.
The circuit is designed to operate with a supply voltage of 25 volts, and by adjusting the configuration of resistors R1, R2, and R3 through switches S2 and S3, the current through the Zener diode can be varied. This adaptability enables the tester to measure Zener diodes with different specifications and characteristics. The ability to switch between different resistor combinations allows for a constant current to flow through the Zener diode, ensuring that the voltage readings obtained are stable and reliable.
Overall, this Zener diode tester circuit is a practical tool for electronics enthusiasts and professionals, providing a straightforward method for evaluating the performance of Zener diodes in various applications.Using electronic scheme below can be designed a zener diode tester using few electronic parts. Using this zener tester and a multimeter can be measured and determined with a high precision threshold voltage of a zener diode. Zener voltage can be read with a DC voltmeter connected in parallel with zener diode. If contact S1 is closed, the resistance R1, T1 and Zener diode current flow. Base transistor T1 is connected to power supply trough the R4, so the transistor conducts. Zener current is equal to the ratio of base-emitter voltage of Q2 and the resistance value R1. With a supply voltage of 25 volts at the actuation keys S1-S3, the current through zener diode take values of about 2. 2, 6 and 22mA. Resistances R2 and R3 or a combination of R1, R2, R3 can be connected in place of R1 with S2-S3 so that through the zener diode constant current flow.
🔗 External reference
Related Circuits
You do not need access to advanced testing equipment to check and troubleshoot computer data cables. Instead, this simple device will provide a quick indication of the status. This device functions as a basic cable tester, designed to assess the...
Create a 555 timer-based circuit where the output pin of the 555 timer is held low by default when powered on, and the input pin is held high at power on. The main requirement is that the output pin...
This circuit utilizes two quad op-amps to create an eight LED audio level meter. The op-amp employed in this circuit is the LM324, a widely used integrated circuit that is readily available from numerous electronic component suppliers. The 1K...
Instead of using a 555 timer integrated circuit, this design employs two transistors configured back-to-back to function as a multivibrator. This arrangement modulates the direct current sufficiently to traverse the magnetic field of a transformer. It represents one of...
This metal detector circuit requires a power supply of 9 volts (DC) or a 9-volt battery. The circuit includes a variable capacitor C1 valued at 365 pF, a 100 pF silver mica capacitor C2, a 0.05 µF disc capacitor...
The schematic for controlling the motors is divided into three main sections, each serving a distinct function. The primary components featured in the schematic include the PIC 18F252 microcontroller, the SN754410 motor driver, and 2N2222 transistors. At the top...