[sdiy] frequency tripler

[Neil Johnson]

Hi,

> Hi All ,can someone please help with this one.
>
> At website n4trb.com , there is a cct described as a freq. tripler(40
> uses for germanium diodes section 3.5 , page 26)

After some hunting around (grrrrr) I found this which I think is what
you mean:

http://n4trb.com/AmateurRadio/SemiconductorHistory/40%20Uses%20for%20Germanium%20Diodes.pdf

on this page:

http://n4trb.com/AmateurRadio/SemiconductorHistory/SemiconductorDocuments.htm

> I built it  , it didn't work.

I simulated it in SPICE (same value resistors, 1N4148 diodes) and after 
adjusting the potential divider I got something out that technically was 
three times the input frequency, with a 1kHz sine input.  But it 
certainly wasn't a sine output, so there'll be lots of harmonics.  And 
you'll need a difference amplifier to extract the signal between the two 
points indicated in the circuit.

I guess the two important questions are:
1/ HOW did you build it?
2/ WHAT were *you* expecting?

> Can anyone explain how it would /should or couldn't work ? BTW it
> wasn't dated April fools day.

In effect its a rather simple (crude) wave folder.

Cheers,
Neil
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