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Sci.Electronics.Basics
Sci.Electronics.Basics is a worldwide Usenet news group for discussion of electronics where there is no such thing as a stupid question. Beginners questions. Discussion of electronics education. Requests for other sources of information.

We found 102 threads matching "ttl"
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We found 102 threads matching "ttl".

Re: Driving two transistors with same signal
BobW - 23:40 09-05-08
"vic" wrote in message news:48250145$0$5055$426a74cc@news.free.fr... > BobW wrote: > > "BobW" wrote in message > > news:B7mdnSJSKb17P77VnZ2dnUVZ_obinZ2d@giganews.c... Read More
Re: Substituting a digital pot for a mechanical pot in an AC voltage control circuit
eljainc - 14:23 02-05-08
Is there any AC motor controller that is computer controlled? (RS-232/ USB or TTL) I guess the Maxim/Dallas parts won't work. I see that even AD digipots wont work (some will ... Read More
Re: Need to generate sequence 001, 010, 100, 001, 010, 100, ...
Clint Sharp - 17:42 30-04-08
In message , John Fields writes > More specifically, a 4017, which is one chip less than shown in my > earlier post. Spot on, clock source? Personally if I was using a 40... Read More
Re: Should I add a resistor the the base...?
BobW - 23:22 02-04-08
"John Larkin" wrote in message news:loh8v395sn5sl3j7jgl0c48cuabncbvdpi@4ax.com... > On Wed, 2 Apr 2008 18:21:26 -0700 (PDT), Kasterborus > wrote: > > > I'm working... Read More
Re: accurate timing/clock for microcontroller? (for measuring bpm)
Bob Monsen - 11:46 11-03-08
wrote in message news:9c27d683-95c3-4c38-b4b7-fd8b46ca2660@n36g2000hse.googlegroups.com... > I would like to build a drum machine/metronome > using a BASIC Stamp 2 (maybe l... Read More
Re: What software to draw schematics?
Paul E. Schoen - 16:39 07-03-08
"John Larkin" wrote in message news:vah1t315eub9d3rpo0eemh10lksa43ne2t@4ax.com... > On Thu, 06 Mar 2008 12:08:54 -0600, George > wrote: > > > Is there a good, smal... Read More
Re: Line Driver Question
Lord Garth - 15:42 03-03-08
wrote in message news:97d6a409-8ac7-4a4d-b88f-270ef78d2a21@s8g2000prg.googlegroups.com... > > Can you include the part number so that the datasheet can be studied? > > ... Read More
Re: 9's Complement BCD Thumbwheel Switches
Mark Zenier - 23:43 11-02-08
In article , Tom2000 wrote: > > I'm helping a guy with a microcontroller project. > > He's going to use some BCD thumbwheels to set a time delay. He > purchased some... Read More
Re: Simple transistor NOT gate
Allen Bong - 19:54 03-02-08
On Feb 4, 2:29=A0am, John Larkin wrote: > On Sun, 3 Feb 2008 08:18:12 -0800 (PST), Chris > wrote: > > > > > > > On Feb 3, 1:52=A0am, Allen Bong wrote: > ... Read More
Re: Binary to BCD converter IC?
02:54 17-01-08
"Bob Monsen" writes: > How much does the programmer cost? I looked into CPLDs a while back, > and the programming algorithm was proprietary, meaning I'd have to > shell ... Read More
Re: Home-use microcontroller purchase
11:54 13-01-08
Tom2000 writes: > I like the idea of micros that you can program with free development > systems and no requirement for dedicated programming hardware such as > the Pica... Read More
Re: woot: ROM tradgedy revisited
Ian Malcolm - 18:58 10-01-08
robb wrote: > woot and and hardy THANKS ! to all the help, > > more small problems with questions at the bottom if you want to > skip the story .... > > short version... Read More
Re: microcontroller ROM copy trouble ?
Ian Malcolm - 06:41 30-12-07
Eeyore wrote: > > robb wrote: > > > > but when i went to recheck i found that the other > > microcontroller board was using a 8051 with internal programand > > not ev... Read More
Re: Parking Sensors
default - 11:26 25-12-07
On Mon, 24 Dec 2007 23:09:00 GMT, "Michael" wrote: > Hi, > > I'm looking at parking sensors and can't work out why there aren't lists of > sites on Google telling you h... Read More
Re: [Followup] 8051/8031 series MCU replace/upgrade ROM issues ?
Dave Platt - 15:19 01-12-07
In article , robb wrote: > should there be any circuit pre-cautions to wiring /EA to Vcc ? > > should i wire direct to closest Vcc source or should i put some > comp... Read More
Re: Darlington Arrays
Peter Bennett - 13:39 01-12-07
On Sat, 01 Dec 2007 16:39:55 GMT, "Michael" wrote: > > "ian field" wrote in message > news:WFf4j.633$yZ4.22@newsfe4-gui.ntli.net... > > > > "Michael" wrote in ... Read More
Re: how to find compatible component ? search made me bleary brained
Eeyore - 12:15 30-11-07
robb wrote: > so i have a **DM7496** (DIP16) that is fried (obsolete), and i > need compatible replacement The vital piece of info*7496*. DM is simply a manufacturer... Read More
Re: RS-232 electrical levels
John Fields - 09:14 21-11-07
On Wed, 21 Nov 2007 03:39:16 -0800 (PST), MarioGL wrote: > Hi all, > > My question es very short: concerning RS-232 ports, why bit-1 is > represented as a negative pulse... Read More
Re: Question: Learning How To Use Hand Held Oscilloscope
Chris L - 18:04 18-11-07
On Nov 17, 9:00 pm, Peter Bennett wrote: > On Sat, 17 Nov 2007 15:51:49 -0800 (PST), Chris L > wrote: > > > Can the below information solve the problem? > > > Chr... Read More
Re: A simple question
John Larkin - 16:04 18-11-07
On Sun, 18 Nov 2007 18:16:54 GMT, "ian field" wrote: > > "Ved" wrote in message > news:abf53904-2433-4ccb-b975-def3d3a875c7@s36g2000prg.googlegroups.com... > > Hi a... Read More
Can someone explain this (simple) schematic
Kasterborus - 09:29 16-11-07
Hi, This is a schematic I've been given for a laser detector circuit. The laser is being pulsed at about 600Hz and the 'PD' (photodiode) is supposed to detect reflected light ... Read More
Re: troubleshooting method for micro-controller board ?
James Sweet - 22:24 05-11-07
> > > I use a low ohm meter (Kelvin), it's very good at > tracking down the nearest point of the short on the > board. > You may want to look at capacitors. Especially... Read More
Re: Mosfet switch issues
ian field - 12:34 31-10-07
"Jamie" wrote in message news:dgPVi.50$Qd1.47@newsfe02.lga... > Jon Slaughter wrote: > > > "ian field" wrote in message > > news:KFNVi.11323$6v.8868@newsfe2-gui.... Read More
Re: HCT/TTL output current and supply current
Grant Stockly - 19:39 25-10-07
On Oct 25, 12:32 pm, Rich Grise wrote: > On Thu, 25 Oct 2007 00:30:04 -0700, Grant Stockly wrote: > > I am trying to compare some standard series and LS parts to HCT parts.... Read More
Re: Atmel AT89C51ED2 in 40 pin DIP package
21:57 22-10-07
Just wanted to update ... I received good news from Atmel this evening. They are coming out with a new component, more advanced then the AT89C51ED2 - and it will be offered i... Read More
Atmel 8051 micro: AT89C51-ED2 in 40 pin DIP package - HELPPPP
12:24 20-10-07
I volunteer with a hobby group on weekends teaching kidfs simple TTL concepts as well as a little programming ... to try to encourage them to enter technology related careers. ... Read More
Re: Component names, packaing, etc..
Wim Lewis - 03:17 18-10-07
In article , Jon Slaughter wrote: > I have a part SN74LVC8T245 that I'm trying to find a footprint for. > > I know the part is ssop so I assume its a sop in general. On t... Read More
Re: Mismatched voltage wired in parallel. What is resulting voltage?
Thomas G. Marshall - 18:25 17-10-07
DJ Delorie said something like: ...[snip]... > No, current ratings are maximums, not absolutes. If those are the > real maximums, the result is a 6V 1mA source. Actual c... Read More
Re: Coil driving
14:13 13-10-07
On Oct 13, 10:58 am, Nuby wrote: > What's wrong with this picture? > > TTL control lines with small current sinking capability (say 20ma) > need to activate electrom... Read More
Need help to modify circuit to work with scanning laser
07:34 09-10-07
Hi, This circuit was designed for me a couple of years ago to detect an interruption in a static laser beam by a photocell. +5> ---+-------------+ | | ... Read More
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