AW: [sdiy] mc1496 app note questions

[Czech Martin]

It took me three times until I finally saw the short to ground.
The funny thing is: I simply did no see what you described.
My brain saw that this solder dot is wrong and therefore
did not pass this information on to me.

So far about "reality".

m.c.




> -----Ursprüngliche Nachricht-----
> Von: Christian Oncken [mailto:Christian at dslab.com]
> Gesendet: Dienstag, 6. November 2001 21:15
> An: synth-diy at dropmix.xs4all.nl
> Betreff: [sdiy] mc1496 app note questions
> 
> 
> I found a circuit for a simple SSB modulator on the web some 
> time ago, built
> it up on a breadboard and stuck it away... yesterday I found 
> the breadboard
> with the circuit still intact and wanted to build it onto 
> perfboard, but
> have lost the schematics.  I searched on the web and couldnt find the
> original schematic, but they were taken directly from the 
> mc1496 app notes
> anyway, so I looked there... I found 2 sets of app notes... 1 
> from motorola,
> and 1 from philips...
> 
> The motorola one looks right, however the philips one looks a 
> bit strange to
> me...
> 
> http://www.semiconductors.philips.com/acrobat/applicationnotes
/AN189.pdf

is it my imagination or is it not good to connect -v directly to ground?  Is
that what is going on in this schematic?  I dont understand... could one of
the list gurus clarify this for me?  figure 5 "double suppressed carrier
modulator"

Anybody looking for a freeked out effect for cheap should build one of these
things... I dig listening to foreign language shortwave broadcasts tuned
slightly out... it sounds so "alien".

Christian Oncken.