[Elecraft] QRP version of KR5L's CW zero beat detector

Sat Sep 14 14:52:00 2002

Hi

Tom has the Mouser part numbers on the website but you can most likely co=
nnect 2 10 or 22 uf capacitors in series back to back to make them non po=
larized. Connect the negative leads together. Note that the capacitance d=
oes not divide by 2 as when connecting capacitors normally in series so f=
or a 10 uf non polarized cap use 2 10 uf capacitors.

Don Brown
KD5NDB =20

----- Original Message -----
From: John McClain
Sent: Saturday, September 14, 2002 1:25 PM
To: [email protected]; Elecraft@Mailman. Qth. Net
Cc: [email protected]
Subject: Re: [Elecraft] QRP version of KR5L's CW zero beat detector

I have been trying to collect the parts for the Sidetone Zerobeat
Detector circuit and I am having a problem finding the 10ufd and 22ufd
Tantalum Capacitors.  The schematic indicates that they are
non-polarized.  I can find polarized Tantalums but not non-polarized
Tantalums.  What have the rest of you who have built the circuit used?

John
K7SVV
K2 #2569, SST 20, Rock Mite 20

----- Original Message -----
From: "Sverre Holm - LA3ZA" <[email protected]>
To: "Elecraft@Mailman. Qth. Net" <[email protected]>
Cc: <[email protected]>
Sent: Saturday, April 27, 2002 7:59 AM
Subject: [Elecraft] QRP version of KR5L's CW zero beat detector

> As one of the more or less tone-deaf CW operators, I have finally
> completed the installation of the CW zero-beat detector in my K2. I
have
> modified the KR5L original circuit in several ways that might
interest
> you:
>
> - QRP version using the CMOS version of 567, so it draws only 0.9 mA
@
> 8V compared to    20mA/8V
> - added an RC to output so it doesn't flicker that much (more of an
> FT1000 look)
> - use right-most K2 LED for display at 1/3-1/2 of intensity of
S-meter
> LEDs
>
> The circuit can be found at http://www.qsl.net/la3za/QRP_Zero.html
>
> 73, Sverre
>
>
>
> Sverre Holm, LA3ZA
> Asker, Norway (59.8N, 10.4E)
> ---------------------------------
> www.qsl.net/la3za
>
>
>
>
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