[Elecraft] CW Zero-Beat Indicator

[Sverre Holm]

> Sverre LA3ZA did produce a CMOS version of the device using 
> an LMC567. 

I have described the low power version on
http://www.qsl.net/la3za/QRP_Zero.html

I am more happy with it now that I changed the audio take-off point from
the loudspeaker in the original to before the AF pot. I had to add a 50X
amplifier for this, but as an added bonus I got an AF output for PSK31
etc. Also I am using the right-most LED for the indicator rather then
the LED in the button.


--
73, 
Sverre

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Sverre Holm, LA3ZA
www.qsl.net/la3za