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Wednesday, 26 October 2016

Test a Diode - Zener Diode



Test a Diode - Zener Diode
Here you can get the diode analyzer circuit for broadly useful utilizing diode. You can likewise test a zener diode by the utilization of this circuit as well. The circuit graph of the diode analyzer here is made of basic Transistors and resistors. Any sort of IC is not utilized as a part of this circuit so it will be simple for the hardware novices for comprehension the working primary of diode analyzer in this circuit. 


CIRCUIT DESCRIPTION
Here we utilized the 12-0-12 stage down 500mA power transformer. The yield of the transformer is supply to the scaffold rectifier made of D2 , D3, D4, D5 which is use to change over the Ac supply to the DC supply. Capacitor C1 is utilized as a channel the DC yield. We utilized 470 μF capacitor yet you can utilized any. Progressively the estimation of capacitor more immaculate DC can be acquired. Resistor R2 of 2.2K is utilized as bleeder. Here you can see the transistor T1 [BC147B] and transistor T2 [SL100] are use for controller compressor. The DC yield is nourished to these transistors. T1 goes about as an arrangement pass driver or an ebb and flow controller. Base inclination for transistor T1 is accomplished from the supply through resistor R3 of 680 ohms as resistor R2 of 10k is a base bleeder and capacitor C2 1 μF channels base potential. At the point when the test is completely open with no zener associated, the base capability of transistor T1 is around 32V that is crosswise over resistor R4 or capacitor C2. 

  

Transistor T1 [BC147B] gives the base potential to transistor T2 [SL100] which goes about as a arrangement pass controller, giving the net DC voltage proportional to T1 base potential which is sustained to the voltmeter. Presently, the voltmeter peruses around 30V with no zener diode associated over the test. Whenever a zener diode is associated over the test, the base capability of transistor T1 tumbles to zener diode breakdown voltage. With this, the base possibilities for transistor T2 and transistor T1 ended up equivalent. The meter now demonstrates the genuine zener voltage. A change of 0.6 V can be done on the meter scale by moving the needle with zero conformity screw on the meter. 

PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon) R1 = 100 Kω; R2 = 39 Kω; R3 = 2.2 Kω; R4 = 680 Ω; R5 = 100 Ω; VR1 = 4.7 Kω; VR2 = 10 Kω 

Capacitors
C1 = 27 KPF (273); C2, C4 = 2.2 μF/16 V; C3 = 22 μF/16 V; C5, C10 = 100 μF/16 V; C6 = 10 μF/16 V; C7 = 100 KPF (104); C8 = 47 KPF (473); C9 = 220 μF/16 V
Semiconductors T1 = BC147B; IC1 = LM386 control speaker Random L1 = Pick up Coil Speaker 8ω SW1 = On/Off switch

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