Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
7805 heats
Thanks for the reply.
I'm not very sure that switching power supply would do good in circuits with microcontrollers in them. Isn't there too much noise or interference in such supplies?
7805 smps
Hi,
I made a circuit I'm going to use in my car which is supplied through a 7805. The input voltage is as high as 14V sometimes and the current it has to deliver goes near 250-300mA. The heatsink reaches 60°C and it is in a closed and tight environment.
Is this safe for the circuit...
Hi!
I would like to modify this design (picture attached) so it can drive three 7seg LED displays. What do I do?
Also, I'd like to make the readout update rate some 200ms. Code attached.
Thanx!
Re: 7-seg display fader
Sorry I got u confused, my bad! That's just stupid what I wrote!
I meant I get a brighter display when it's dark, when it should be the opposite. Man, I hope I got it right this time, let me read it again.
Yeah, that's it. So how can I reverse the effect? There are no...
How can I fade the 7-seg displays using the blanking input on 14513 & photo-resistor?
Hi!
How can I fade the 7-seg displays using the blanking input on the 14513 and a photo-resistor?
So far I did a trick with an oscillator to lower the duty-cycle using one of the 74C14 NOT gates but I need...
Hi, sorry if I repeat any of some previous topics, couldn't find anything by search.
Anyway, I can't find my way around speeding up the display on my digital speedo that I've recently put together.
The driver is a 4553 and 14513 combo (multiplex) and the update rate is currently about 1 sec. As...
halogen transformer 12v
Thanx xxargs! I'll keep those things in mind. Are you sure though, that the voltage won't drop under the hum level under heavy load if 12V transformer is used?
Should I use a higher voltage input i.e. 15V or so? And if so, do the diodes do the trick in dropping the...
halogen hum
Can anybody describe a transformer used for halogen lightbulbs (interior lighting). Actually I would use it in a way it wasn't ment to be used... I bought a portable refrigerator based on a Peltier device with a brushless fan similar to computer cooling fans, rated 12V/55W to be...
bascom 7 segment 4511
Hi!
I came across a schematics which I would like to build, but the original design uses LED displays (3 pcs - 7-segment, 13mm), not LCD what I would prefer. So, my question is: how can I alter the circuit so it can drive the LCD display (3½ or 2½ 7-segment digits). Thanx...
74247 ic
Right. Then what would be the adequate replacement, in other words - I want tails on the 6's and 9's, that's why I want to replace the 4511. Is there a possibility or do I have to redesign the circuit?
ca3162 replacement
I have a simple and dumb question: can I replace the 4511 with a 74247? The pinout seems to match and I don't see any other difference...
Sorry, except the "6" and "9" with a tail, but then again, that's why I want to replace the 4511.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
