Re: Need help with constant tone in audio output
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try large capasitor ie ?50uf ?25 volt working ? ? across power supply.............
On Monday, 20 February 2017, 13:51, Raj vu2zap <vu2zap@...> wrote:
FIrst I am suspecting the power supply.
Second disconnect the volume plug and see, I would suspect the tone will
be there if the PS is at fault.
Third If the tone stops then suspect the preamp transistor or
earlier.
As you said you have disconnected the rest.
Raj
At 20/02/2017, you wrote:
Good morning Jerry and the
group,
Had to stop last night, having probed for nearly 10 hours. Jerry, my
trouble shooting is hampered by not having an up-to-date schematic. My
board is a Bitx40 V3. It's interesting to note that when I power the '40
up the tone is immediate and the rcvr comes on about a second later. I
have all the components taken out of the '40 except the volume control...
still the tone. I wonder if India could replace the board given the
amount of time spent trying to get it working? I'll continue to trouble
shoot today and will keep you and the group updated. BTW, the tone
encountered is not a clicking noise.
73,
Chuck K3VPZ
From: "Jerry Gaffke via Groups.Io"
<jgaffke@...>
To: [email protected]
Sent: Sunday, February 19, 2017 4:59:53 PM
Subject: Re: [BITX20] Need help with constant tone in audio
output
Did you enable the analog vfo by adding L4?
If the tone is still there with no vfo, that's a hint
On Sun, Feb 19, 2017 at 01:07 pm, <chucke2@...> wrote:
- Have disconnected the Raduino, tone still there.
?
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