I have the NE612 version with frequency range 30-60kHz which I use outside.
Your design, Rogs, is fundamentally the same as what I'm attempting to do, I believe, just with different components. Would you agree?........ You used a multiplexer for the mixing whereas I'm using the double balanced NE612 mixer - was your method balanced or did you not find this to be necessary?
I was looking at this article and noticed a few things that didn't seem correct or needed.
33K across the 4069, Normally recommended as 10M.It is not a low current higher voltage 4069, instead it is a higher current low voltage 74HC04 that works fine as a linear amplifier with a 33k negative feedback resistor.
It removes high frequency "hash" from the mixer.Also I don't see a need for the LP Filter.
His Design:
**broken link removed**
I wanted to contact the Designer in Japan about this, But I don't see any Contact Info for him.
So I did a Redesign of it, also using a 9 Volt Battery.
I also tested it, using a 24 Khz pickup. (.0022 Cap)
See My Design, ALSO Works REALLY GOOD.
His Email address is on the lower left corner on his page.I was looking at this article and noticed a few things that didn't seem correct or needed.
33K across the 4069, Normally recommended as 10M.
Also I don't see a need for the LP Filter.
Hi
**broken link removed**
I wanted to contact the Designer in Japan about this, But I don't see any Contact Info for him.
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