Showing posts with label zener. Show all posts
Showing posts with label zener. Show all posts
Wednesday, July 10, 2013
Zener Diode Tester
In this schematic circuit is presented a very simple Zener Diode Tester circuit that require few external components to be build .
Zener Diode Tester Circuit diagram
As you can see in the schematic circuit , the Zener Tester project is based on a common 741 operational amplifier .The supply need only be as high a value as the zener itself . The variable resistor P can be calibrated ( in volts ) , so when the LED 1 lights the voltage on pins 2 and 3 of the 741 operational amplifier is nearly equal .
Zener Diode Tester Circuit diagram
Monday, July 8, 2013
Zener Diode Tester Schematic
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.
Zener Diode Tester Circuit Schematic Diagram
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.
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