Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it ;-)

You have a granddaughter with that circuit lab kit. Eventually you will
explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease did.

On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it ;-)

You have a granddaughter with that circuit lab kit. Eventually you will
explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease did.


Grand_son_... 8 years old... the same one who's on the All Star Inline
Hockey Team and was just awarded a trophy for best defensive player of
the whole league ;-)

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

The touchstone of liberalism is intolerance

Jim Thompson wrote:
On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it ;-)

You have a granddaughter with that circuit lab kit. Eventually you
will explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease
did.


Grand_son_... 8 years old... the same one who's on the All Star Inline
Hockey Team and was just awarded a trophy for best defensive player of
the whole league ;-)

Well then just pretend that he's going to be an engineer and not a
goalie.

On Mon, 16 May 2016 07:29:45 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it ;-)

You have a granddaughter with that circuit lab kit. Eventually you
will explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease
did.


Grand_son_... 8 years old... the same one who's on the All Star Inline
Hockey Team and was just awarded a trophy for best defensive player of
the whole league ;-)

Well then just pretend that he's going to be an engineer and not a
goalie.


He's super with math, and loves the circuit lab upgrade I gave him at
Christmas. But he's struggling with reading... a bit of dyslexia...
time to hire a tutor (I would do it, but he needs an authoritarian
type to keep him from deviating from work and controlling the
conversation... he's a charmer... seeks out the girls in the crowd...
and he's only 8 ;-)

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Liberalism: Dictatorship By The People Who Think They Know Best

Jim Thompson wrote:
On Mon, 16 May 2016 07:29:45 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it
;-)

You have a granddaughter with that circuit lab kit. Eventually you
will explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease
did.


Grand_son_... 8 years old... the same one who's on the All Star
Inline Hockey Team and was just awarded a trophy for best defensive
player of the whole league ;-)

Well then just pretend that he's going to be an engineer and not a
goalie.


He's super with math, and loves the circuit lab upgrade I gave him at
Christmas. But he's struggling with reading... a bit of dyslexia...
time to hire a tutor (I would do it, but he needs an authoritarian
type to keep him from deviating from work and controlling the
conversation... he's a charmer... seeks out the girls in the crowd...
and he's only 8 ;-)

I first kissed a girl at 7, and was made fun of more for that than for
doing experiments.

On Mon, 16 May 2016 11:22:24 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Mon, 16 May 2016 07:29:45 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it
;-)

You have a granddaughter with that circuit lab kit. Eventually you
will explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease
did.


Grand_son_... 8 years old... the same one who's on the All Star
Inline Hockey Team and was just awarded a trophy for best defensive
player of the whole league ;-)

Well then just pretend that he's going to be an engineer and not a
goalie.


He's super with math, and loves the circuit lab upgrade I gave him at
Christmas. But he's struggling with reading... a bit of dyslexia...
time to hire a tutor (I would do it, but he needs an authoritarian
type to keep him from deviating from work and controlling the
conversation... he's a charmer... seeks out the girls in the crowd...
and he's only 8 ;-)

I first kissed a girl at 7, and was made fun of more for that than for
doing experiments.

Today, you'd be expelled (for either).

On 5/16/2016 9:22 AM, Jim Thompson wrote:
On Mon, 16 May 2016 07:29:45 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Fri, 13 May 2016 09:11:16 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:
On Thu, 12 May 2016 15:09:45 -0400, Phil Hobbs
wrote:

How about writing that book I've been bugging you about?

I ponder that, but I'm not sure I'd be good at writing... circuit
design is so easy for me I'm not sure I can explain how I do it ;-)

You have a granddaughter with that circuit lab kit. Eventually you
will explain things. Just think about how you will do that.

Or occupy your time by riding a bike over the Himalayas like Pease
did.


Grand_son_... 8 years old... the same one who's on the All Star Inline
Hockey Team and was just awarded a trophy for best defensive player of
the whole league ;-)

Well then just pretend that he's going to be an engineer and not a
goalie.


He's super with math, and loves the circuit lab upgrade I gave him at
Christmas. But he's struggling with reading... a bit of dyslexia...
time to hire a tutor (I would do it, but he needs an authoritarian
type to keep him from deviating from work and controlling the
conversation... he's a charmer... seeks out the girls in the crowd...
and he's only 8 ;-)

...Jim Thompson

Maybe he is gay. At that age, I doubt he is horny.

bitrex wrote:

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.

I wonder it the required components could be squeezed into a
daughterboard that would fit the space available. Might require
some vertical mounting hack.

The amps in old Tek scopes also go bad, and there's a market for
replacing them too. I suggested years ago that somebody should make a
DIP module to replace them. Today's standard op-amps could do it I bet.

On 06/04/2016 09:41 AM, Tom Del Rosso wrote:
bitrex wrote:

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.

I wonder it the required components could be squeezed into a
daughterboard that would fit the space available. Might require
some vertical mounting hack.

The amps in old Tek scopes also go bad, and there's a market for
replacing them too. I suggested years ago that somebody should make a
DIP module to replace them. Today's standard op-amps could do it I bet.



A lot of Tek scopes use weirdly high supply voltages.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

On 5/12/2016 1:51 PM, Jim Thompson wrote:
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


Did you complete the audio compressor/limiter you were working on for
a bit?
Mikek