28-08-2016, 08:33 PM
Just flip one of the diodes.
Having not seen any schematics (always useful if people post them when asking questions), I'm assuming it's bring used as a limiter - not allowing an AC signal to exceed a certain value.
So on the positive-going peaks, one zener will be acting as a regular diode, with 0.6V dropped across it. Meanwhile, the other zener will be being a zener, holding 2.7V across it - giving a total of 3.3V, give or take.
On the negative-going peaks, the diodes switch roles...
It's crude, but basically works.
Having not seen any schematics (always useful if people post them when asking questions), I'm assuming it's bring used as a limiter - not allowing an AC signal to exceed a certain value.
So on the positive-going peaks, one zener will be acting as a regular diode, with 0.6V dropped across it. Meanwhile, the other zener will be being a zener, holding 2.7V across it - giving a total of 3.3V, give or take.
On the negative-going peaks, the diodes switch roles...
It's crude, but basically works.
