Jim Thompson
Wrote in message:
I sit here bored out of my skull with nothing to do but play Solitaire
until the next project start on July 5 ;-)
I'm noted for custom Analog/Mixed-Signal Design and Spice Behavioral
Modeling, but I also do designs using off-the-shelf components.
No project is too small... I've even done one-day designs from
time-to-time.
Drop me an E-mail (*)
(*) Do not include attachments in your first E-mail... An E-mail not
matching an entry in my addressbook and with an attachment drops your
E-mail into a black hole.
...Jim Thompson
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| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
In the mid 1980s, Roland had International Rectifier design a
custom chip called the IR3R05 for their analog synthesisers. I
think it was a 14 pin package...it basically consisted of 4 OTA
stages like the Lm13700 configured as a 24 db/octave resonant low
pass filter with inputs for voltage controlled frequency and
resonance, along with a VCA with both linear and exponential
inputs, all on the chip. The 4 filter capacitors were mounted off
chip on the board.
What kind of job would it be to design a chip or maybe a
daughterboard that performed an equivalent function? These chips
often fail in vintage equipment and there seems to be a decent
sized market for replacements that dont require scrounging for
NOS or cannibalizing old units.
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