Re: Hum on new build
Hello Curt KB5JO,
When I solder a project, I always do it one component at a time, and
my solder joints bleed through to the top of the PCB a wee bit. Then I
clip the leads and check the soldered part with a magnifying glass
before I place the next part. I checked all the parts with test
equipment before they were soldered. All of them were well within
tolerances, AFAIK. Anyway, I checked again, and I did not miss any
solder joints. The BNC connector is soldered to the PCB very well, as
are the battery terminals, and the audio jack.
I suspect the part of the circuit with the headphone driver to be the
culprit? I did not solder the IC directly to the PCB, I soldered an
8-pin DIP socket to the PCB, then attached the IC to the socket. That
is the only thing I did that deviated from the assembly guide. Which
component(s) do you think might be suspect?
I can probe (circuit-bend?) parts on the Pixie and get different
things to happen. I have not probed the Cricket 40 (yet). I get the
background hum when I use a 9V battery AND when I connect the Bench
Power Supply to the battery terminals.
I think I can live with the background hum. I bought the kit because I
think it is beautiful. It was not that difficult to put together, and
I had an enjoyable time doing so. I was really just curious to know if
that background hum was normal? Is your Cricket silent except for the
Ken, KM4NFQ "Not Fully Qualified"
On Mon, Feb 17, 2020 at 7:49 AM Curt via Groups.Io