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I remember that, but things were a little simpler then too.
Today with some of my clients, I get schematics that have 38
capacitors all shown in a string in the upper left hand corner.
They are the bypass capacitors for all the IC's. I think they do
that to make the schematic less cluttered, especially when you have
a 100 pin FPGA.
But...when I was designing and working with the draftsmen to make
printed wiring boards, I trained them that the schematic told a
If I placed a bypass capacitor directly to the pins on an integrated
circuit, that told them, place it right at the pins. If the
capacitor connected to one pin and had a ground symbol on the other,
it said put it near.
On 9/9/2019 9:36 AM, James Daldry W4JED
Back in tube days you commonly found all the filaments in the
lower right hand corner of the schematic. In many cases the
power transformer 6.3 volt winding ended in 2 arrows. It was
assumed that if you were working on the equipment you knew what
a filament was.
On 9/9/19 9:29 AM, Fred Piering
Any schematic that does not show all connections is incomplete
On 9/8/2019 9:59 PM, Bob Macklin
It's common practice with solid state
electronic not to show the power pins on the chips.
"Real Radios Glow In The Dark"
----- Original Message -----
Sent: Sunday, September
08, 2019 10:00 AM
Subject: Re: [QRPLabs]
Persistence seems lacking...
One of the problems with the schematics given with
the kits is not all of the connections are shown... For
instance, on the QLG1 GPS board for the U3s, there are
no connections shown for power and ground for IC1. On
the Relay-switched LPF kit there are a gaggle of
connections marked with X for jumpers/external
connections, etc that make it very unsuitable for
debugging... Although most commercial radio schematics
have a whole lot more detail, they are much easier to
read as all the connections to any plugs/jacks are
routed to the side and grouped by the plug/jack in
numerical number, and jumpers are shown in the default