3 Nov
2018
3 Nov
'18
2:59 a.m.
On 3 Nov 2018, at 01:27, Paul Berger via cctalk
<cctalk at classiccmp.org> wrote:
Are you saying that there is a capacitor between input? output? of the 79L05 and the
ground pins of the chips? If so that would seem pretty normal as it is usually
recommended that you have capacitors to ground on both the input and output side of a 3
terminal regulator. Are the ground pins on the three chips you mentioned isolated from
the ground of the rest of the board?
Hi Paul,
The trace goes from power socket to pin 2 of the 79L05 and a small value cap which is
connected to the GND plane along with pin 1 of the regulator. Pin 3 goes directly to a
decoupler then straight to those 3 chips which are isolated. Today I?ll break out the ?tin
foil covered sponge? method of tracing any other points on the board that I might have
missed last night.
Cheers,
--
adrian/witchy
Owner of Binary Dinosaurs, the UK's biggest home computer collection?
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