AN: LInks to Lancaster Classics Project Reprints...

[kinyo]

kinyo wrote [without context]:

That's cool, Keith!
Frank

http://groups-beta.google.com/group...-on-Google+show-options+click-THAT-Reply-link

now I can see the difference ... thanks Jeff

 

[Jasen Betts]

=========================

BTW, Tektronix also released their rights to legacy equipment tech docs.
The big question is when HP will do likewise.

as a further aside at least one pubblisher encourages free distribution
of many of their their books in electronic form.

If you line science fiction hit http://www.baen.com/ or borrow a booke with
an enclosed CD-rom from a library

Bye.
Jasen

 

[Terry Given]

In college (early '70s) I built a quadrature smiley face generator
(known as "Ozzie") for credit. It used a two op-amp quadrature
oscillator to generate the Lissajous and logic/amplifiers to shift it
around to draw the face/eyes/eyebrows/nose/mouth. It had a built in
intercom so it could "talk" to the kiddies at the Engineering Open
House. The mouth vertical signal was modulated by the amplitude of the
remote person (usually hiding in a darkened adjacent room above the
transom). It was a fun bunch of college credits. ;-)

Very nice indeed.

I designed a digital logic lab experiment (for a lab paper....), part of
which was a circuit that drew K-maps (2-6 variables) on an analogue
scope. All digital, cobbled together on evil plug-in breadboards, and
done entirely with green wire - hey, I did it at home, its all I had. I
programmed an EPROM for the character generator. The circuit provided
the excitation signals, the circuit under test fed back into my
box-of-junk, and voila, up came the K-map. I used a 2nd EPROM to hold
"worked examples" and a switch toggled between their circuit and my
K-map. That was back before I realised how easy it was to count to 1,
and switched to analogue electronics.

Cheers
Terry

 

[John Woodgate]

I read in sci.electronics.design that Keith Williams <[email protected]>

In college (early '70s) I built a quadrature smiley face generator
(known as "Ozzie") for credit. It used a two op-amp quadrature
oscillator to generate the Lissajous and logic/amplifiers to shift it
around to draw the face/eyes/eyebrows/nose/mouth. It had a built in
intercom so it could "talk" to the kiddies at the Engineering Open
House. The mouth vertical signal was modulated by the amplitude of the
remote person (usually hiding in a darkened adjacent room above the
transom). It was a fun bunch of college credits. ;-)

I saw one of those when I was about 12 years old (1949) at the Brimar
(Standard Telephones and Cables, later ITT Components Group) valve/tube
factory. Many 6SN7s. No talking, though.

 

[Tim Shoppa]

if you happen to have a copy of an old

circuit of Lissajous Pattern Generator
which features some bit of complicated waves
instead of the usual simple sine waves?

IIRC it was on the cover so if you find a stack it ought to be easy to
find. It was some sort of polar function generator as best as I can
recall - there are chapters on this in the MIT Radiation Lab series
volume on Waveforms.

A sure way to make patterns which are substantially more complicated
than the "usual simple sine waves":

http://frank.harvard.edu/~paulh/misc/lorenz.htm

I did this and added ten-turn pots to control the s, r, and b
parameters, and a 3-pole switch to select different integration time
constants. Bought a biggish (11" diagonal") X-Y scope on ebay for a
few bucks to watch it. Neat stuff.

Tim.

 

[Keith Williams]

I read in sci.electronics.design that Keith Williams <[email protected]>


I saw one of those when I was about 12 years old (1949) at the Brimar
(Standard Telephones and Cables, later ITT Components Group) valve/tube
factory. Many 6SN7s. No talking, though.

The original "Ozzie" that I replaced was from about that period. The
one I made had far more 741s than the original had tubz though. ;-)
Mine had more features (eyebrows, winking/crossed eyes, intercom) and
741s were cheap.

 

[Keith Williams]

That's cool, Keith!

I'd be very interested to see the schematics if you still have it. I'm
sure, even 30 years later, that project would still amuse kiddies. This
time we have the capability to project the signals to a wall with toy
led lasers using mirrors, which i currently have. I do intend to use my
laser+mirror setup for the lissajous pattern generator ... and I have a
kid to amuse!

Believe it or not, I had them until very recently. After not using
them for over 30 years... :-(

It wouldn't be too hard to resurrect though. The quadrature oscillator
was two integrators solving the sine-cosine equations for 1KHz (with a
couple of zeners across one to lightly clamp the amplitude). The zero
crossings were detected to switch a state machine through the different
features. Each feature generator had a gain and offset to draw it the
appropriate size and location on the 'scope. The mouth and eyebrows
used an absolute-value circuit for the vertical. Winking and crossing
eyes was a matter of killing the vertical or alternating
vertical/horizontal. All-in-all, it was rather straightforward. The
mechanics were probably as difficult as the rest (a half dozen PCBs in
a lucite box to make it look "high-tech .

 

[Keith Williams]

Very nice indeed.

I designed a digital logic lab experiment (for a lab paper....), part of
which was a circuit that drew K-maps (2-6 variables) on an analogue
scope. All digital, cobbled together on evil plug-in breadboards, and
done entirely with green wire - hey, I did it at home, its all I had.

Ick! I did a bunch of that in college. Never again! The "Ozzie" was
on "PCBs". They weren't exactly "printed", rather "turned" on a lathe.

I programmed an EPROM for the character generator. The circuit provided
the excitation signals, the circuit under test fed back into my
box-of-junk, and voila, up came the K-map. I used a 2nd EPROM to hold
"worked examples" and a switch toggled between their circuit and my
K-map.

Output to a X-Y scope was rather the hard way, or did you raster-scan
it?

That was back before I realised how easy it was to count to 1,
and switched to analogue electronics.

I went from analog to digital after graduation. My employer had this
crazy idea that there was more money in "counting to 1". ;-)

 

[Terry Given]

Ick! I did a bunch of that in college. Never again! The "Ozzie" was
on "PCBs". They weren't exactly "printed", rather "turned" on a lathe.




Output to a X-Y scope was rather the hard way, or did you raster-scan
it?

raster scan. prior to uni I had spent 3 years fixing monitors, smps and
videogame boards, and had an unhealthy fascination with graphics cards
(6845 anyone?).

I went from analog to digital after graduation. My employer had this
crazy idea that there was more money in "counting to 1". ;-)

was he right?

Cheers
Terry

 

[Keith Williams]

raster scan. prior to uni I had spent 3 years fixing monitors, smps and
videogame boards, and had an unhealthy fascination with graphics cards
(6845 anyone?).

Using a graphics controller is cheating. ;-) Pong was quite the thing
then. Several of my friends built pong games out of TTL for their TVs.

was he right?

With a market cap of $131B, I suppose so. ;-)

 

[Terry Given]

Using a graphics controller is cheating. ;-) Pong was quite the thing
then. Several of my friends built pong games out of TTL for their TVs.

nice. I was a tad young for a DIY pong when it came out, but am pleased
to say my K-map monstrosity was LS-TTL all the way.

With a market cap of $131B, I suppose so. ;-)

I'll take that as a very definite yes. I'm picking your share was a bit
less though (aint that always the way).

Cheers
Terry

 

[Keith Williams]

I'll take that as a very definite yes. I'm picking your share was a bit
less though (aint that always the way).

Drop the 'B', and you're close. ;-) No, I don't get any real "profit
sharing", just a salary. I don't even own any stock, though I briefly
(10 weeks - picked up 11%) had a good deal of it in my 401K.

 

[John Woodgate]

I read in sci.electronics.design that Terry Given <[email protected]>

I was a tad young for a DIY pong when it came out,

I don't think you CAN be too young for that, not if you're actually
born. (;-)

 

[keith]

I read in sci.electronics.design that Terry Given <[email protected]>


I don't think you CAN be too young for that, not if you're actually
born. (;-)

The "DIY" part was what I think he was referring to. Not too many
designed PONG themselves.

 

[John Woodgate]

The "DIY" part was what I think he was referring to. Not too many
designed PONG themselves.

Since people say you are a robot, I would be wrong to expect a sense of
humour, or much imagination. Very young people are expert at DIY pongs.

 

[Pig Bladder]

Since people say you are a robot, I would be wrong to expect a sense of
humour, or much imagination. Very young people are expert at DIY pongs.

<RIMSHOT!>

 

[keith]

Since people say you are a robot,

Only the commies, kids, and other jack-booted liberals. ...but I love you
too. ;-)

I would be wrong to expect a sense of
humour, or much imagination. Very young people are expert at DIY pongs.

Sorry, the language doesn't compute. I've learned what a POM is here,
but PONG is a video game from the early '70s. DIY PONG is a home-built
video game, likely the last in its class.

 

[John Woodgate]

Sorry, the language doesn't compute.

Pong = bad smell. English word, you know?

 

[Jasen Betts]

I would be wrong to expect a sense of

Sorry, the language doesn't compute. I've learned what a POM is here,
but PONG is a video game from the early '70s. DIY PONG is a home-built
video game, likely the last in its class.

"pong" as in stink, I have a & month old expert living here, she makes pongs
all by her self...

Bye.
Jasen

 

[krw]

Pong = bad smell. English word, you know?

No, in fact I don't. I'm 'merican, not English (only 1/4 English by
ancestry) so... BTW, it is not listed in Webster's (m-w.com).