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If one zener won't pull any current until the voltage reaches 104 Volts, that's okay unless you have one that conducts at 96 Volts in parallel with it. The 96-Volt part will pull all the circuit current, and the 104-Volt part will never kick in at all. Bear in mind that both of these parts are within 5% of 100 Volts. And if you use zeners rated at a 10% tolerance, the risk is just higher.

Ultimately, its just a risk. If one zener gets hot and the other one doesn't that pair are too far apart. And if they do share the load, they each had working voltages that were close enough.

And this is where fixing your own stuff is different from doing it for hire. A fix that "might" work is not professional grade. Can't charge pro price for a job that "might" be right. But if it turns out to work for you, it's all good. And if you have to turn around and buy two 50-Volt zeners, this is how you'll find out. Nothing ventured, nothing gained.

73

<blockquote data-quote="nomadradio" data-source="post: 812992" data-attributes="member: 22">If one zener won&#039;t pull any current until the voltage reaches 104 Volts, that&#039;s okay unless you have one that conducts at 96 Volts in parallel with it. The 96-Volt part will pull all the circuit current, and the 104-Volt part will never kick in at all. Bear in mind that both of these parts are within 5% of 100 Volts. And if you use zeners rated at a 10% tolerance, the risk is just higher.Ultimately, its just a risk. If one zener gets hot and the other one doesn&#039;t that pair are too far apart. And if they do share the load, they each had working voltages that were close enough.And this is where fixing your own stuff is different from doing it for hire. A fix that &quot;might&quot; work is not professional grade. Can&#039;t charge pro price for a job that &quot;might&quot; be right. But if it turns out to work for you, it&#039;s all good. And if you have to turn around and buy two 50-Volt zeners, this is how you&#039;ll find out. Nothing ventured, nothing gained.73</blockquote>

[QUOTE="nomadradio, post: 812992, member: 22"] If one zener won't pull any current until the voltage reaches 104 Volts, that's okay unless you have one that conducts at 96 Volts in parallel with it. The 96-Volt part will pull all the circuit current, and the 104-Volt part will never kick in at all. Bear in mind that both of these parts are within 5% of 100 Volts. And if you use zeners rated at a 10% tolerance, the risk is just higher. Ultimately, its just a risk. If one zener gets hot and the other one doesn't that pair are too far apart. And if they do share the load, they each had working voltages that were close enough. And this is where fixing your own stuff is different from doing it for hire. A fix that "might" work is not professional grade. Can't charge pro price for a job that "might" be right. But if it turns out to work for you, it's all good. And if you have to turn around and buy two 50-Volt zeners, this is how you'll find out. Nothing ventured, nothing gained. 73 [/QUOTE]

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