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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"

You are looking at page 1 of 5.

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...Testing a TTL chip

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. ...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... > > ...Re: reg + reference

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...3 phase motor driver

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: 8 Bit number to 3 seperate 7-segment LED displays

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...Re: Compuserve closing, need to relocate website

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-...LVTTL to RS-232 adaptor

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! :) ...Re: AN: GuruGram #106 newly available for free download...

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...Simple SD Interface

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: MAx232 unused inputs

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: A digital design question

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...Re: Cascading two 74LS90's doesn't work (needs deglitching)

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 ...SPDIF to TTL

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:...Re: current-mode opamps

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...High Speed Driver?

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...looking for a transistor

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...Re: D82C55AC-2

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...6800 clock generator circuit

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:/...SPDIF to AES/EBU

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: Non-Scientific Survey of Scientific Calculators

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: How to interface a microcontroller to fibre optic?

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: reg + reference

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: Z80 CP/M SBC design project

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: Using CMOS logic for amplifying small signals

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: Driving a piezo sounder

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: Influenced by Science Fiction

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...Re: Which type of volatile RAM has the least duration of data  remanence when power-offed?

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. ...Favorite jellybean ~HF BJT?

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 ...Re: PWM dsPIC33F

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 ...Tiny logic-controlled high-voltage buffers?

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 ...200 volt SPDT solid state switch needed

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) ...fast pulse radio transmission

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: Thermostat + Timer

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: Blew the fuse in my multimeter, wanted to replace it, grabbedit,but

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: C-multiplier again

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: SD-24 guts

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: OT:  SLR Cameras

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: Advice on Logic Analyzer

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: High to Low voltage shifter

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...Re: AN: Classic PosrtScript Video remastered to web
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