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How to build a zener diode tester

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;Discharging
 
;Discharging
320V is a high voltage and can be dangerous. So its important to lower the voltage to a safe level before you touch the contacts. R3 is used to discharge the bottom capacitor, and R2 is used to quickly discharge the lower capacitor when power is switched off. R1 is used to discharge the top capacitor and the neon lamp discharges the top capacitor when its voltage is above 80V. So when the switches are turned off the bottom capacitor quickly discharges and the output voltage is almost instantly lowered to around 160V. The upper capacitor discharges more slowly. It takes about 2–3 seconds to lower to 80V and the lamp turns off, and it takes about 7 seconds to drop to 10 Volts. But when the lamp turns off its safe to touch, and add/remove the diode.
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320V is a high voltage and can be dangerous. So its important to lower the voltage to a safe level before you touch the contacts. R3 is used to discharge the bottom capacitor, and R2 is used to quickly discharge the lower capacitor when power is switched off. R1 is used to discharge the top capacitor and the neon lamp discharges the top capacitor when its voltage is above 80V. So when the switches are turned off the bottom capacitor quickly discharges and the output voltage is almost instantly lowered to around 160V. The upper capacitor discharges more slowly. It takes about 2-3 seconds to lower to 80V and the lamp turns off, and it takes about 7 seconds to drop to 10 Volts. But when the lamp turns off its safe to touch, and add/remove the diode.
   
 
==How to use==
 
==How to use==
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** If the voltage is not relatively constant, the zener diode is bad, or its not a zener diode
 
** If the voltage is not relatively constant, the zener diode is bad, or its not a zener diode
 
* If you need to test it with more current, press the button, and the current will be tripled.
 
* If you need to test it with more current, press the button, and the current will be tripled.
** If you are testing high voltage zener diodes, you will probably need to use this
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** If you are testing high voltage zener diodes , you will probably need to use this
 
** If you are testing lower voltage zener diodes, the voltage should only change a little.
 
** If you are testing lower voltage zener diodes, the voltage should only change a little.
   
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