Search found 316 matches

by Gorgon
Sun Mar 16, 2014 3:45 pm
Forum: General Discussion
Topic: need suggestions - GPS clock
Replies: 21
Views: 3582

Re: need suggestions - GPS clock

If you need to drive 7 segment LED displays you could use ICM7211A (4 digits) or ICM7218 (8 digits) to drive the display. The microcontroller just write the pattern into the chips, like 4 or 8 byte memory, and they take care of all the multiplexing of the displays. It was Intersil that came with the...
by Gorgon
Tue Oct 30, 2012 6:57 am
Forum: General Discussion
Topic: WHERE ARE THEY?
Replies: 32
Views: 6392

Re: WHERE ARE THEY?

I'm hanging around several forums doing electronics, not posting too much any more. From what I see, you can put the average advice concerning building electronics in two buckets. If you can't us a 555 to solve the problem, you need a microcontroller (picaxe/ arduino/ plain PIC processor) to solve i...
by Gorgon
Tue Oct 30, 2012 6:02 am
Forum: General Discussion
Topic: Decimal to seven segment conversion...
Replies: 9
Views: 1885

Re: Decimal to seven segment conversion...

If you have found your solution, good. If not, I will come back with my old idea of using some old eproms if you got them. A 2716 2k eprom would do what you need if programmed correctly. The address lines are the inputs(10(11)) and the data lines the outputs(8). So if you have some 2716 or higher la...
by Gorgon
Tue Feb 28, 2012 4:39 am
Forum: General Discussion
Topic: Battery Shock!!
Replies: 16
Views: 5179

Re: Battery Shock!!

I had a friend stop over recently with an old portable tube radio. You old timers will remember, the IU4, IT4, 3V4... He was interested in getting it operating again just for grins. That quickly got shelved when we looked for the batteries. The 'B' battery, 67.5V is $60+ and the 7.5V 'A' battery we...
by Gorgon
Sat Jul 02, 2011 3:43 pm
Forum: General Discussion
Topic: is everyone on vacation ?? no activity here since the 19th
Replies: 26
Views: 3863

Re: is everyone on vacation ?? no activity here since the 19

I'm also around at uneven intervals. I've been without a private PC for some months, but are now up and running again. One thing I see is that this forum tends to become an exclusive US dominated forum. I think it was a bit more diverse before, but I may be wrong. As a foreigner, the discussions of ...
by Gorgon
Thu Jan 13, 2011 4:07 am
Forum: General Discussion
Topic: What is the "complement" to the 74LS154?
Replies: 5
Views: 999

Re: What is the "complement" to the 74LS154?

You could make the 16 to 4 decoder yourself with a eprom(or flash) with 16 address lines, like the 27(8/9)xx512. Program it for the different values and get whatever combination outputs you want. I have never heard about a 16 to 4 bit decoder or priority encoder type chip.

TOK ;)
by Gorgon
Wed Nov 10, 2010 7:05 am
Forum: General Discussion
Topic: Is this forum dying?
Replies: 30
Views: 4894

Re: Is this forum dying?

I have to admit that I only occationally take a peep in here. We had a period of repeated 'trolling' here, and I think that turned me off. I used to like to be here, but from what I see now there are little activity with the general themes we had before. Living in Europe I have little knowledge and ...
by Gorgon
Fri Aug 27, 2010 6:52 am
Forum: General Discussion
Topic: Nuts and Volts vol 1. No. 1
Replies: 10
Views: 2112

Re: Nuts and Volts vol 1. No. 1

Have you guys thought about making a CD collection on all the old volumes of NV?

I would love to have a copy since I never saw these distributed in Norway at the time.

We can't all just pop in and have alook ourself :cool:

A digital library of NV so to speak?

TOK ;)
by Gorgon
Sun Sep 06, 2009 11:45 am
Forum: General Discussion
Topic: What Microcontroller Language do you prefer?
Replies: 19
Views: 7165

Re: Microcontroller Language Poll

I've used assembler for embedded projects at work and private for 30+ years, and I'm starting on C now, at least at work. If you use assembler, you get closer to the hardware. If you are programming an 8-bit micro you'll always need to get very close to the hardware anway, and any higher level langu...
by Gorgon
Tue Apr 21, 2009 11:17 pm
Forum: General Discussion
Topic: "Counters" day coming soon...
Replies: 10
Views: 1510

Re: "Counters" day coming soon...

I really have to remember this, since I have my birthday the 9.9.09 :smile:

TOK ;)
by Gorgon
Mon Jun 16, 2008 2:07 pm
Forum: General Discussion
Topic: Early Microcontroller Info
Replies: 5
Views: 1868

TMS1000 was normally used as a custom programmed ROM device, as far as I remember. This means that it is specially designed for this game, and nothing else. I think there was special versions with piggyback external eprom sockets for development, but I might be wrong.

TOK ;)
by Gorgon
Thu Nov 15, 2007 9:10 am
Forum: General Discussion
Topic: Ice detector
Replies: 20
Views: 5621

I suppose you have a thermostat on the heater. Combining the heater ON power with lack of current should get your alarm going off. If you know the temperature is below 3 C you also know the danger for freezing exist, depending on the pollution in the water, and wind chill.

TOK ;)
by Gorgon
Thu Jun 21, 2007 2:38 pm
Forum: General Discussion
Topic: Measuring 220 AC with an ADC
Replies: 21
Views: 5150

The 1N4007 is the rectifier.

TOK ;)
by Gorgon
Thu May 03, 2007 2:53 pm
Forum: General Discussion
Topic: Assembler Reference Z180
Replies: 2
Views: 1322

Try this, http://www.zilog.com/download/default.asp?email=na&from=download&server=www.zilog.com&scriptname=default.asp&FAM=200,203,205,206,213,214,215,216,217,218,219,220,224,225,226,227,228,229,230,231,232,233,234,235,236&DT=10,11,13,14,17,19,21,22,23,25,28,30,31,33,34,42,43,44,45,46,47,48,49&id=11...
by Gorgon
Mon Apr 30, 2007 5:46 am
Forum: General Discussion
Topic: Rookie Frequency Divider Question
Replies: 17
Views: 3645

You could also solve this with an old eprom and a binary counter. Make a sequence 1609 cycles long and program the eprom to let out 1000 cycles during this sequence and use oneof the outputs to reset the counter on the correct number of cycles. This way you increase the accuracy too.

TOK ;)