Category. Description, Digital Alarm Clock. Company, Sanyo Semiconductor Corporation. Datasheet, Download LM datasheet. Quote. Find where to buy. LM datasheet, LM circuit, LM data sheet: SANYO – Digital Alarm Clock,alldatasheet, datasheet, Datasheet search site for Electronic Components . datasheet search, datasheets, Datasheet search site for Electronic Components and LM Datasheet(PDF) 5 Page – Sanyo Semicon Device.
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This is not much of a problem today, but back in the day especially in eastern Europethe mains had probably around Hz so electronics engineers either avoided using this IC or made separate oscillator blocks with quartz crystals search for 50 Hz timebase circuit.
(PDF) LM Datasheet PDF Download – Digital Alarm Clock
This process is repeated fast enough that our eyes see the complete image. In case you want to build the project and you can’t source a suitable common cathode duplex display, here’s the electrical schematic of one that’s tested to work: Fortunately there’s a simple fix dataaheet. But they are fantastic clocks.
Thanks for your story and all the detail. It shouldn’t be too hard to use normal leds instead of a display. I reset the clock and it appeared to have cured itself. Regarding the display mode, the current build shows the time in military format 24H. And it’s old, really old. You can leave pin 26 disconnected for 60 Hz, or leave it grounded to use it at 50 Hz with care, as ground is VSS here.
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One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value. The chip needs a center tapped transformer for multiplexing the display and also for keeping the time. Info on the code is no longer available. The one in the picture was cut from a broken floppy disk ribbon cable. I have a small lamp plugged into the same circuit. I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code.
I played around with it a bit more and it finally started keeping time again. Some other details The chip can work with both 50 Hz this is what I used or 60 Hz mains frequency.
They are no longer sold and GE has no support for them anymore.
And as a plus, you can make it as big as you wish as long as the the power consumption is held within the chip limits. While the power is out, screen output will also be off. A few days later, it started to lose time, but kept running. I use one on my bedside table.
Without the backup battery, the time will simply reset. I used a 2 x 6V one, rated at datadheet so it doesn’t get too hot.
The advantage of this design is that it allows to use less wires to connect the display to the board. You can also go with a 2 x 7.
The schematic Since I was in need of a easy to read clock, I decided to make one with this chip. Putting it all together First the PCB was built datashewt the photo-transfer method then etched.
Before going further, there are a few things that need to be kept in mind when working with this chip: These are great clocks and if my lamp had not damaged it, it may have kept running forever. The only difficult part was finding a suitable display duplex LED, model S. Posted by Alex at DrinkTea July 15, at If you have one of those clock radios from back in the day, it most likely uses a variant of this chip or maybe a Chinese knock-off.
This will prevent oxidation of the copper. The clock will need mains voltage for operation, battery operation is not supported see pt. The radio still worked, so I moved it to another room and plugged it in. The chip’s absolute maximum power dissipation is mW. So when half of the display is on, the other half is off.