cbusuttil
Active Member
To make sure that the +13V will never go up more than 13V (currently the output of the Pioneer regulator is around 14V) which, if for some bizarre reason it spikes over 15v, it will end up frying most of the chips found in the tuner (iirc one of the chip's maximum voltage input is 15v).... I have added a linear regulator, LM317; should any of the transistors fail, all of the 13V circuits would be protected. I bought this for a mere 3$ from ebay. Has a trimming pot too.
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