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TTL
Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 180 threads matching "ttl"
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The most relevant threads are listed first
Testing a TTL chip
2009-02-15 16:39:00
I am trying to figure out if a TTL chip of mine (for my science fair -
see "Vacuum Tube Calculator Schematic" for more) to see if I burned it
out. It's a 7474, and I've connected the ~PRESET inputs directly to
+5V because I do not want to be setting it (only reseting it). Did I
do something wron...
TTL signal
2008-12-09 15:11:00
I'm trying to convert an analog signal, 150mV, 3-5nS pulse width to a
TTL signal.
...Re: reg + reference
krw@att.bizzzzzzzzzzzz - 2010-04-01 18:52:00
On Thu, 01 Apr 2010 09:27:59 -0400, Phil Hobbs
wrote:
> On 3/31/2010 11:53 PM, krw@att.bizzzzzzzzzzzz wrote:
> > On Wed, 31 Mar 2010 22:14:16 -0500, "Tim Williams"
> > wrote:
> >
> > > "John Larkin" wrote in message
> > > news:2vt7r5p5qcrd78neuabj8b9gu837pecbt2@4ax.com...
> > ...3 phase motor driver
GregS - 2008-11-26 10:50:00
I have been fishing through drivers hoping to find something.
Anyone know of a 3 phase mosfet driver module
with TTL in and the old board used a 170 VDC supply or rectified 120 line.
probably less than 10 amps. I have seen pieces, but
looking for an integrated module. The control circuitry
is i...Re: 8 Bit number to 3 seperate 7-segment LED displays
Paul Burke - 2008-01-08 11:44:00
Sean Brown wrote:
> Good afternoon,
>
> I was wondering if anyone can give me some ideas on how to take an 8-
> bit number and display it on 3 LED displays.
>
> I would be extremely grateful if you could give me a push in the right
> direction.
I used to know several methods of do...Re: Compuserve closing, need to relocate website
Nobody - 2009-04-24 18:42:00
On Fri, 24 Apr 2009 09:53:57 -0700, Joel Koltner wrote:
> > I don't imagine there can be more than one location for any domain
> > name, so if I want to move someplace else, do I have to close the old
> > account first and then setup the new?
>
> The important thing to know here is that...LVTTL to RS-232 adaptor
2008-05-29 06:16:00
Hello,
I am looking for a LVTTL to RS-232 adaptor.
I found a similar adaptor http://www.hvwtech.com/products_view.asp?ProductID=289
But this adoptor does TTL to RS-232.
Since I plan to convert the LVTTL output from a Virtex-4 FPGA to
RS-232 signal, I need LVTTL to RS-232 adaptor.
Virtex-...Re: AN: GuruGram #106 newly available for free download...
Bitrex - 2010-05-06 19:19:00
Don Lancaster wrote:
> ... as
>
> Sourcecode is separately available as
>
>
> Additional GuruGrams at
>
> This is the eighth release in a series of eBay strategy and tactics
> tutorials.
>
The secret is to sell used copies of the "TTL Cookbook" for $3.04! :)
...Simple SD Interface
FyberOptic - 2010-01-07 11:09:00
Hi folks. Maybe I'll try this here since the electronics.basics
newsgroup is fairly inactive these days apparently.
Anyhow, I want to do something fairly simple, but I want the advice of
someone who actually knows more about this stuff to make sure I don't
do something wrong that I'm not taki...Re: MAx232 unused inputs
petrus bitbyter - 2010-01-06 09:29:00
"lighthouseman" schreef in bericht
news:9885e2a0-1802-483c-b9e8-147d1a110a1c@j14g2000yqm.googlegroups.com...
> Here's a nice simple one for you....
> If my design has 5 CMOS serial ports, and I use something like 3 x
> MAX232, which have 2 drivers/receivers on each chip, then what shoul...Re: A digital design question
Bob Eld - 2010-01-13 11:11:00
"Bitrex" wrote in message
news:Qq6dnXrFS-I2KtDWnZ2dnUVZ_s2dnZ2d@earthlink.com...
> I'm playing around with some 7400 series logic, trying to teach myself
> the basics of digital design. I've been able to come up with a working
> circuit for a 24 hour digital clock easily, but I'm strugg...Re: Cascading two 74LS90's doesn't work (needs deglitching)
Arie - 2008-04-26 07:52:00
"Rocky" wrote in message
news:68d837c4-9528-4982-872f-2d90a7943691@h1g2000prh.googlegroups.com...
> So now I need to alleviate reflections causing the multiple triggers.
> Do people have suggestions as to how I do that ?
ALWAYS use buffers and terminators to drive cables (or "electrical...SPDIF to TTL
Dirk Bruere at NeoPax - 2010-06-07 18:10:00
There are a number of circuits on the Net to do this. For example:
http://sound.westhost.com/project85.htm
In Fig 5 should that IC be a 74HC04 as stated, or 74HCU04?
--
Dirk
http://www.transcendence.me.uk/ - Transcendence UK
http://www.blogtalkradio.com/onetribe - Occult Talk Show
...Re: current-mode opamps
Jim Thompson - 2008-02-27 09:58:00
On Tue, 26 Feb 2008 21:30:20 -0800, John Larkin
wrote:
> On Tue, 26 Feb 2008 20:48:30 -0800, "Jim Thompson"
> wrote:
>
> >
> > "John Larkin" wrote in message
> > news:4te8s3h7h4037d3mgmqcroh4a9au5npndk@4ax.com...
> > > On Tue, 26 Feb 2008 11:29:06 +0100, Fred Bartoli wrote:...High Speed Driver?
Vladimir Vassilevsky - 2009-03-17 10:10:00
I need to generate the accurate waveform from TTL input. The swing
should be ~20Vpp, slew rate > 1kV/us, load current ~5mA, top and bottom
tied to the reference voltage. The switch like that can certainly be
done with few discrete components, however I wonder if there is a single
IC solut...looking for a transistor
2008-01-01 16:48:00
I need to switch some GE #44 lamps from a TTL output. #44 lamps are 6.3 volts
at 250 ma, so I'll need a transistor to do the real work. Unfortunately, it's
just a hair too much power for one of the hundreds of surplus 2n2222's I keep
around to do almost everything else here. Can someone sugges...Re: D82C55AC-2
Rich Grise - 2008-05-20 20:05:00
On Tue, 20 May 2008 12:09:03 -0700, aleksa wrote:
> I've bought 10 pcs of "82C55" through mail, and received D82C55AC-2.
>
> The problem is that the output high voltage of any pin is not 5V, but
> 3.8V.
>
> Nothing is connected to the port pins, VCC is 4.85V.
>
> Am I wrong thin...6800 clock generator circuit
rombios - 2009-01-19 23:23:00
curse the 6800 the 6802,6803 were much easier to play with. Onboard clock
generators for phase1 and phase2, I simply had to provide a ttl
compatible signal as clock input or rig up a crystal
does anyone have a clean/simple clock generator logic for the 6800 thats
meets its requirements (no...SPDIF to AES/EBU
Dirk Bruere at NeoPax - 2010-03-02 16:49:00
Looking for a reliable circuit for the level conversion from SPDIF to
TTL. I then intend to feed it to an RS485 driver and into a transformer
for transmission via CAT5e
--
Dirk
http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http:/...Re: Non-Scientific Survey of Scientific Calculators
John Fields - 2008-02-01 18:35:00
On Fri, 01 Feb 2008 12:39:56 -0800, John Larkin
wrote:
> Right about that time I got an HP35 for $400. I still have it.
---
Back then, I got one of these:
http://www.hpmuseum.org/3qs/973q.jpg
which I also still have.
---
> I also
> got a PDP-11, which taught me how to think...Re: How to interface a microcontroller to fibre optic?
StoneThrower - 2009-03-30 15:11:00
> Where can I find more information about interfacing microcontroller to
> fibre optics?
A possible solution - TTL-to-FO link or converter
1st read this: Cypress, AN13853, http://www.cypress.com/?docID=2349
then look after FO drivers mentioned in above AN, from OPTEK Technologies,
http://w...Re: reg + reference
Tim Williams - 2010-03-31 23:14:00
"John Larkin" wrote in message
news:2vt7r5p5qcrd78neuabj8b9gu837pecbt2@4ax.com...
> DEC loved wire-wrap, but as logic got faster the impedance and
> crosstalk issues became untenable. PCBs were cheaper anyhow.
Ironically, ECL came out before TTL.
They routed those with twisted pair. ...Re: Z80 CP/M SBC design project
Frank Buss - 2008-07-28 15:58:00
lynchaj wrote:
> It is a opportunity to educate people about home brew computing and
> the history of computing electronics.
Real men don't use boutique chips like Z80, but only standard TTL for
building a computer:
http://www.homebrewcpu.com/backplane1.htm
--
Frank Buss, fb@frank-...Re: Using CMOS logic for amplifying small signals
Vladimir Vassilevsky - 2008-01-04 12:30:00
Mr. B wrote:
> Something has occurred to me, and I was wondering if anyone knew more about
> this. Could a CMOS logic inverter, like a 4049, be used as a very high
> gain amplifier if it were properly biased?
Using TTL and CMOS logic IC as the linear amplifiers used to be a
textboo...Re: Driving a piezo sounder
Scott Seidman - 2008-06-05 19:47:00
Martin Griffith wrote in
news:00dg449i60rbpcch0qr51n4qcij1de4mfv@4ax.com:
> I've just got back to thinking how to drive piezo sounder, and was
> wondering if something like the Natsemi LM4908 headphone amp working
> in bridge mode would be ok.
> The piezo has a 18nF capacitance
> T...Re: Influenced by Science Fiction
Jasen Betts - 2009-01-04 04:33:00
On 2009-01-03, Frank Buss wrote:
> Dirk Bruere at NeoPax wrote:
>
> > As they say in the script: "It's a VR simulation in the cyberspace
> > representation of the networked microprocessor GPS system PCB." Or
> > something.
>
> And why do they throw some wires in the box, first, wh...Re: Which type of volatile RAM has the least duration of data remanence when power-offed?
MooseFET - 2010-05-13 09:27:00
On May 12, 8:07=A0pm, GreenXenon wrote:
> Hi:
>
> Which type of volatile RAM has the least duration of data remanence
> when the power is offed?
Some TTL RAM chips wake up with the same pattern just about every
time no matter what they had in them at power off. Many low power
CMOS o...Favorite jellybean ~HF BJT?
Tim Williams - 2009-12-17 13:33:00
2N2369 is an old standby... kind of high current (200mA), like a '3904 sped
up about 2-3 times. Not well specified though, I suppose because it's so
old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you
wanted to make old school RTL circuits that run as fast as 74S TTL. ...Re: PWM dsPIC33F
Pasquale - 2008-05-21 19:26:00
> You want *code* now? Sorry, posting code would be completely off-topic
> here and I could be strung up by my bolo tie. Hint: You can usually
> change the PWM to regular port pins (and back) on the fly.
>
>
> Best regards,
> Spehro Pefhany
I don't want any code. I agree with your ...Tiny logic-controlled high-voltage buffers?
Joel Koltner - 2009-01-19 16:48:00
We often have something like a 5V or 3.3V logic line coming from an FPGA or
microcontroller that needs to drive something like a 28V bias line to an RF
PIN diode or some RF amplifier's power supply or what-not... and in generally
we do this with a couple of FETs and a resistors or two, and it ...200 volt SPDT solid state switch needed
Steve - 2009-05-20 11:06:00
I need a SPDT solid state switch that can handle 200 volts on one pole
and 0 volts on its other and be switched by TTL. I have up to 10 mA
available to drive the switch. Switch output current is low ( < 1 mA)
and switching speed can be slow (1 msec). Ideally, 4 or 8 on one chip
would be nice ...fast pulse radio transmission
sergio108 - 2008-05-08 08:14:00
Hi All.
I want to find a transmitters-receivers or transceiver can be used in
our project.
We are developing a project where we need to send and receive random
asynchronous digital TTL pulses (5 to 10 microsecond wide) without
delay trough RF at a variable rate from 10000 (1e4) to 100000 (1e5)
...Re: Thermostat + Timer
ChrisQ - 2009-10-15 11:19:00
Jan Panteltje wrote:
>
> You can make a nice zero crossing power switch for 240 V with a MOC3041,
> driving a TIC263M triac, that one can do 25 A continuous (use heatink).
> The MOC3041 needs 15 mA, PIC can drive that, the MOC3042 10mA, and the MOC3043 needs only 5mA.
> Just did one las...Re: Blew the fuse in my multimeter, wanted to replace it, grabbedit,but
Michael A. Terrell - 2010-04-30 22:42:00
Grant wrote:
>
> Management software on my provider's site allows me to speed up the DNS
> updates while making changes, drop back to slower updates when stable,
> so updates go out in hours, not days.
Thak's ok if the new TTL has propogated around the world, before you
change ov...Re: C-multiplier again
John Larkin - 2010-05-27 09:56:00
On Thu, 27 May 2010 10:02:58 GMT, Jan Panteltje
wrote:
> On a sunny day (Wed, 26 May 2010 19:23:49 -0700) it happened John Larkin
> wrote in
> :
>
> > I could have used an LED, which would be cool -
> > they light up! - but I didn't want any stray light inside our box.
>
> Stick...Re: SD-24 guts
ChrisQ - 2009-11-03 16:37:00
John Larkin wrote:
>
> These Tek 11801-type scopes sometimes throw an error on powerup and
> while running. Many of them just go away.
>
> John
>
If they have microprocessor control, another thing to watch out for is
the static ram chips in some early micro controlled test gea...Re: OT: SLR Cameras
Jim Yanik - 2010-02-28 08:56:00
"Martin Riddle" wrote in
news:hmc6ef$ent$1@news.eternal-september.org:
>
>
> "Jim Thompson" wrote
> in message news:entio55mdsac2582pmna8liqea59iuee8u@4ax.com...
> > SLR Cameras... recommendations?
> >
> > ...Jim Thompson
> > --
> ...Re: Advice on Logic Analyzer
2008-04-14 20:29:00
On Apr 14, 1:55 pm, n...@puntnl.niks (Nico Coesel) wrote:
>
> I've used the logic port. It has way to little memory and it is not
> very straightforward to use. If it where my money I would get the
> janatek because it has 1mbit/channel memory.
>
I've experienced that too. It is a nice ...Re: High to Low voltage shifter
2009-05-27 03:45:00
On May 27, 3:44=A0pm, "Electronworks.co.uk"
wrote:
> Hi Jake
>
> When you say 'nmos switch' do you mean an N channel FET? If so, this will
> allow you to interface to a HIGHER voltage (limited by the drain source
> rating of the FET), so 3v3 logic can interface to, say 12V, 24V etc).
...Re: AN: Classic PosrtScript Video remastered to web
tlvp - 2010-08-09 23:54:00
On Mon, 09 Aug 2010 10:15:54 -0400, Don Lancaster wrote:
>
> Free download at < http://www.tinaja.com/videos/ps1.mp4 >
>
> Presently needs a three minute download.
> We eventually will get it on YouTube as well.
Heh ... here in coastal Connecticut, where the information superhigh...