Square + triangle = sine (almost) - Page 6

 

On Fri, 12 Mar 2010 09:29:27 -0500, Phil Hobbs


For FM it's hard to beat the old analog way... discriminator.  I used
an active filter version on my very first modem design (300 Baud,
"muff" coupled to a telephone :-)
        
                                        ...Jim Thompson
--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
            
      The only thing bipartisan in this country is hypocrisy

 

MooseFET wrote:

This is indeed a very cute circuit, in fact I had built something similar,
but with one more opamp.

ciao Ban

 


<SNIP to here>


  A little over a decade ago, I worked along with 2 partners on what we
hoped would be a patentable significant on an "electric guitar fuzzbox".
As in able to get a patent for improvement over prior art in US patents
by Pittman and Scholz (sp).

  "Our" device received rave reviews where we showed it off.

  "We" abandoned the project after determining that "we" could make a
majority as much money working at entry level at a big-name fast-food
restaurant as "we" could getting this device manufactured and selling it,
even should (unlikely) sales volume get the cost of patenting it to be
negligible-per-unit, let alone battling whoever tries their hand at
infringing "our patent" in a case likely costing upper 10's of kilobucks
to hundreds of kilobucks (I can't rule out megabucks) in a court battle.

  One of "us" (we 3) even schmoozed the likely examiner of the
prospective patent application to extent of hearing from the likely
examiner that a patent would likely be granted.

  This "improved fuzzbox" never went to any actually filed patent
application.  It was since published on the web, at least significantly
where web searching for it or major segments of it are best found by
AND-ing search terms of "LXH2" and either of the 2 major brands of British
electric guitar amplifiers - Fender or Marshall.

 - Don Klipstein (don@misty.com)

 

On Tue, 09 Mar 2010 23:36:12 -0500, Bitrex


wrote:

done.

think

Yep, It's the sort of circuit arrangement where you can continue
pretty much forever :-)


Possibly.
        
                                        ...Jim Thompson
--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
            
      The only thing bipartisan in this country is hypocrisy

 

Jim Thompson wrote:

wrote:

   Yup! Good 'ole analog DFGs..