I have two power supplies that supply 3.3VDC at up to 2A, 5.0VDC at up to 3A, and 12VDC at up to 5A. Unfortunately, I have now lost two Raspberry Pi and a host of chips in my circuits before realizing that my expensive power supplies are spiking up to 12V when first turned on. Can I use Zener diodes to protect my circuits and equipment from these spikes? If so, what value/part# for each range? Yes, I can buy new power supplies but I really don't want to loose my investment in the ones I have. Also, any suggestions on in-line fuses? Any help would be greatly appreciated. TIA
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