Search found 33 matches

by IRONMAN
Fri Jul 18, 2003 9:51 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

Greetings all; been a little busy latley with school etc.(I aced the silly little entrance exam!) no_vice ; I appreciate the offer, however I need to place a large order with a couple of supply houses anyway, I'll stock up on a few chips while I'm at it. stephen ; I think I was half asleep last time...
by IRONMAN
Wed Jul 16, 2003 11:36 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

You mean you cannot preset a 0001 and get them to count down to zero? Where are you getting data for these devices? I could only find limited(very limited.) data sheets from digi-key's web site. Do you happen to have a copy of the TTL cookbook? mine is the 26th printing, if yours is similar, look on...
by IRONMAN
Wed Jul 16, 2003 7:35 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

Damn stephen, you're good. I think I found an equally lazy way to achieve my silly little circuit though, a couple of CMOS 4018's, they are decade DOWN counters, which means simple hook-ups of a few BCD coded switches. However the data sheets were somewhat lacking, not explaining what the cascade pi...
by IRONMAN
Tue Jul 15, 2003 6:50 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

No I don't have any, I was trying to keep the circuit as simple as possible, and the 4016's have look ahead capability built in(I.E. only reloading the preset number when all units that are cascaded together hit zero simultaneously.).
I'll come up with another scheme, I was just trying to be lazy.
by IRONMAN
Tue Jul 15, 2003 2:13 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

I was planning something along the lines of an N and only N pulser, using three 4016's along with some BCD switches to pre-load a number from 1 to 999, I thought it would be handy to be able to step clocked circuits through a selectable number. However @ fifty bucks([email protected]#$%^G ouch! :eek: ) a pop I thi...
by IRONMAN
Tue Jul 15, 2003 12:17 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

Re: mc4016

desterline; Thanks for trying but see below.<p>Ron; the mc4016 is an MTTL device, not a cmos device. It's easy to confuse the two because they both have the 4016 in their part #'s. The device I'm looking for is a decade ripple down-counter, with presets.<p>[ July 15, 2003: Message edited by: IRONMAN...
by IRONMAN
Mon Jul 14, 2003 10:26 pm
Forum: General Discussion
Topic: mc4016
Replies: 15
Views: 3232

mc4016

I need a detailed data sheet(s) for this chip A.K.A. the 74416, I have limited info about it from the TTL cookbook. Looked around, CANNOT find it, I assume its been phased out? Even so surely there is still info somewhere?
Thanks guys.
by IRONMAN
Mon Jul 14, 2003 10:14 pm
Forum: General Discussion
Topic: ac/dc conversion and regulation
Replies: 12
Views: 2738

Re: ac/dc conversion and regulation

I understand that the supply is no more than 28 VAC, however when you rectify that 28 VAC with a bridge circuit and add a filter cap. you'll end up with very close to 40 VDC. Thats just about to much for a little 7805 to deal with. If you need any other voltages higher than 5 volts in the circuit, y...
by IRONMAN
Mon Jul 14, 2003 2:42 pm
Forum: General Discussion
Topic: ac/dc conversion and regulation
Replies: 12
Views: 2738

Re: ac/dc conversion and regulation

Rebel: You really should use a different transformer, as stephen pointed out dropping 35-40 volts down to five is extremely inefficient, Think about it lets say your circuit uses 1/2 an amp(not unreasonable.), @ a forty volt input thats 17.5 watts of power wasted across the regulator! Give in and bu...
by IRONMAN
Sat Jul 12, 2003 1:19 pm
Forum: General Discussion
Topic: ac/dc conversion and regulation
Replies: 12
Views: 2738

Re: ac/dc conversion and regulation

I agree with chris, the I.C. regulators are usually the cheapest most reliable way to go, however if you're talking about 24 VAC then be careful becuase when you run that through a bridge rectifier your out-put is about maximum for the 7805's input voltage(about 35 volts peak.), the higher the volta...
by IRONMAN
Fri Jul 11, 2003 9:22 pm
Forum: General Discussion
Topic: WTB for friend: Cheap 12V 20A supply
Replies: 10
Views: 2447

Re: WTB for friend: Cheap 12V 20A supply

Go to E-BAY do a search for "12 volt power supply"
I saw several reasonable units.
by IRONMAN
Tue Jul 01, 2003 7:37 pm
Forum: General Discussion
Topic: 2.4 GHz vs. 900 MHz Phone Technology
Replies: 20
Views: 5715

Re: 2.4 GHz vs. 900 MHz Phone Technology

I don't know a whole lot about the newer rf technologies, but I allways assumed frequencys in the GHZ range would travel further(at least line of sight.). To be honest, after having known and talked to several "engineers" , some of whom could'nt even build an audio freq. amp for thier guitars, I'm t...
by IRONMAN
Wed Jun 25, 2003 7:08 pm
Forum: General Discussion
Topic: MOSFET vs. Transistor
Replies: 21
Views: 3001

Re: MOSFET vs. Transistor

Ouch!! To be honest what you're wanting to do is both complicated and impractical, I'm not trying to be smart, it's just that what you require would be a tremendous amount of work if you built everything yourself, for instance you need voltages that are higher than the supply & you also need a negat...
by IRONMAN
Wed Jun 25, 2003 4:51 pm
Forum: General Discussion
Topic: MOSFET vs. Transistor
Replies: 21
Views: 3001

Re: MOSFET vs. Transistor

Question: what are you using as a source? I mean what are you getting your raw voltage from?
Sounds like you're wanting to use a car battery, is this correct?
by IRONMAN
Tue Jun 24, 2003 8:02 pm
Forum: General Discussion
Topic: MOSFET vs. Transistor
Replies: 21
Views: 3001

Re: MOSFET vs. Transistor

What you're trying to do is use a transistor in a series pass configuration to amplify the current capability of a regulator? I use to do that a lot, but I'm sure there are high current regulators on the market(why re-invent the wheel?), I originally thought you wanted to use mosfet in some kind of ...