That's exactly it, i was bypassing the regulator.

The PIC seemed to function fine at 9v, it was still doing its job, but
it did get a little hot to the touch. The 7414 got too hot to touch,
and didn't function. When i started messing around with the circuit,
trying to find out what went wrong, i shorted something which caused
the PIC and the 7414 to die. On my second attempt (with a new PIC and
7414, but still bypassing the regulator), i managed to kill the PIC
but not the 7414 (in midi learn mode, FWIW). At that point, i decided
to check the voltages: the input of the regulator was at 5V, and the
output was at 9V, which is the opposite of what it should have been.
That's when i realized my careless mistake. So I moved the 9V+ to the
input of the regulator, burned a new PIC, and boom- i had a fully
working MC2.

The thing that was confusing me was the fact that the PIC was working
the whole time, but not the 7414. In retrospect, the voltage is the
FIRST thing i should have checked!

-justin
= burnkit2600.com =


--- In lsdjmc2@yahoogroups.com, marco <marco@...> wrote:
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> Il giorno 04/lug/08, alle ore 19:22, Ove Ridé ha scritto:
> > Wait a minute... The schematic contains a 7805 regulator. I don't see
> > how you could possibly accidentally feed the PIC with mroe than 5 V
> > unless you feed the 7805 with 40 V or something like that.
> > Or did it happen when programming the PIC?
>
> as far as i understood he was sort of "bypassing" the voltage
> regulator and was feeding the circuit with 9 volt unregulated.
>
> marco
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