James Finnegan Profile Topics Started Replies Created Engagements Search replies: Forum Replies Created Viewing 1 post (of 1 total) Author Posts June 23, 2014 at 10:47 am in reply to: Automotive Zener Diode Protection #11846 James FinneganParticipant Thanks for replying….Yes but I’m concerned about spikes and voltage transients above 15v which might damage the 555 timers. Cheers Author Posts Viewing 1 post (of 1 total)