Electronics > Beginners
Convert one output into another for 7 seg. display
mikerj:
--- Quote from: Spemo on June 16, 2019, 05:18:40 pm ---This seems to me like a good option - 2 chips per counter, and some LED driver (transistors?) - that should simplify the whole thing.
Pretty easy to get for me aswell, which are named CD4511BE and CD74HC147E here., will const me about 1.50€ for the pair, 9€ for the whole clock.
The question is, do they work with less than 10 inputs?
Thanks a lot for your help
--- End quote ---
Note that the 74HC147 has inverted outputs so it is not directly compatible with the CD4511BE without an extra inversion stage. The inputs also also inverted, so ensure that works for your application.
pwlps:
--- Quote from: mikerj on June 17, 2019, 10:55:16 am ---Note that the 74HC147 has inverted outputs so it is not directly compatible with the CD4511BE without an extra inversion stage. The inputs also also inverted, so ensure that works for your application.
--- End quote ---
Good remark indeed, so finally a 7447 or similar open-collector driver IC with active-low logic will be simpler. This will likely be more than 1.50€ for the pair though.
Spemo:
hmmm, are there any chips that are easily compatible with each other, without the need for an inversion stage?
I mean this is what it looks like now, if I have to do this with 3 chips, then I might not find a place for them on the circuit board....
It would come out tho 18 chips in total...
as you can see it's pretty crowded.... the arrows and the orange lines mark the positions of the diodes.... the white wires connect them to the counter modules on the outside of the circuit board
oh and board size is 18x30cm
soldar:
I am not sure how the relay clock is designed or what the purpose is but if you could get it to output BCD instead of 1 of 10 it would simplify things a lot. And you could probably save some relays as well.
Spemo:
it's a clock circuit designed to be a clock - for seconds, minutes, hours. it counts in decimal, basicly what you see on a normal digital clock is what it's actually counting. makes some nice noises... sure a lot of relays, but alt least you know by the noise if just a minute went by or an hour...
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