On 09/29/2017 07:19 PM, Ethan Dicks wrote: > On Fri, Sep 29, 2017 at 4:20 AM, Francesco Messineo > <firstname.lastname@example.org> wrote: >>> I will also change the timing resistor and tantalum capacitor on the >>> 555 reset circuit, I've noticed the reset signal isn't very well >>> behaved (it resets randomly and sometimes doesn't release the reset >>> line). I think the tantalum capacitor is shorting randomly to ground >>> or the 1M resistor is intermittent. > > It _should_ be a ceramic cap there (not all hard-shell shiny caps are > tantalums) but if it's a large value and electrolytic, it's probably a > tantalum. I'd be less worried about the resistor failing, but that's > an easy test. > > Either way 555-based reset circuits do age poorly. Do they? So far I didn't have a broken 555 reset circuit in a C64 or similiar. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2017-09-29 18:03:34
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