I want to make LED clock with alarm and sleep function. But, LM8560 datasheet confuses me. I dont know supply voltages (there is so many of them). Can anyone upload some shematics (other than those in datasheet)? Thanks.
Try http://images.google.co.uk/images?svnum=10&hl=en&lr=&safe=off&q=LM8560 that returns 3 schems all funny languages but you should be able to work something out Voltage appers to be anywhere between 6 and 14 volts so 9 would be ideal
Stefan, That clock chip was originally used for clock radios and uses a weird connection to the 7 segment displays. You will see there are multiple segments connected together to one pin on the IC as the display cathodes are split in 1/2. Unless you have 7 segment displays that have each individual pins without a common cathode connection, it will be very hard to build a clock with this ic. If you make your own displays with individual leds, then this is possible. If you look closely at the schematic, yo will see what I mean. A better 4 digit clock chip would be the MM5316, S1998 or the S7317B. These chips are a lot easier to wire up with standard displays. Regards, Sal Brisindi
Is there any schematic or wiring diagram for those duplex LED displays? I have usual LED displays (two of them, every has two digits). Every has one common cathode. And I'm interesting if I could use them.
Stefan, You will not be able to purchase the type of 7 segment display you need for this clock chip. If you really want to build a clock with this IC you will have to make the 7 segment display out of discrete leds. Lets say 4 per segment but instead of the display having a common anode or cathode, you will have to split it up with it having 2 anodes or cathodes. Just study the schematic from the link provided above and you will understand. Sal Brisindi
Post #2. You can figure out everything you need from the top left image. However, given that you plan on purchasing display parts, I think you would still be better off switching to another chip that is easier to use, as recommended above. The chips are not expensive. > Hey salb203... Is the Jersey Freeze still around?
If you are determined to utilize this chip, then you can simply AND your BCD outputs with the input frequency and then feed it into whatever standard 7-segment display you want. Make sure to take the compliment of the frequency by utilizing an inverter to feed into the other half of the segments. Case in point, this is just a de-multiplexer circuit.
CanaKit has kits with LM8560. Those are kits CK253, CK255 and CK118. Does anybody have schematics of any of these kits? Thanks.
I've just got to know the reasoning behind the determination to use this chip, when there are so many less difficult solutions Looks like the CK118 uses the hard to find led module referenced earlier, so won't be helpful. CK253 & CK255 use discrete led's rather than 7 segments. This is another solution that is kind of like the multiplexing... The problem with conventional 7 segment display's is that they share a common cathode, but this chip requires that the segments be divided between 2 cathodes. You can see on the schematic posted earlier how the segments are shared (A+F, B+G, C+D, E+E). It's hard to tell from the images if they are using transistor led drivers to handle the additonal current; you might have to include them.
So, do you have any schematic of clock with LM5316? I want to build it using 3mm LEDs instead of display.
