Hi
In a simple 555 based pump driver circuit two smd diodes PJ5N (in parallel) are connected across the pump (12V). But after some time of operation the diodes are blown.
I have been replacing the two damaged diodes with a varistor successfully. I have a lot more of those unused pumps (with undamaged diodes) and I am thinking to add a varistor as a precautionary measure. My question is, is it okay to use diodes and varistor together as transient suppressor? Actually, I want to save time for the removal of the diodes.
In a simple 555 based pump driver circuit two smd diodes PJ5N (in parallel) are connected across the pump (12V). But after some time of operation the diodes are blown.
I have been replacing the two damaged diodes with a varistor successfully. I have a lot more of those unused pumps (with undamaged diodes) and I am thinking to add a varistor as a precautionary measure. My question is, is it okay to use diodes and varistor together as transient suppressor? Actually, I want to save time for the removal of the diodes.