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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Fortunately there’s a simple fix available. When the power is out, the chip will activate an internal Hz oscillator that uses Datwsheet and R4. They are no longer sold and GE has no support for them anymore. That lasted a few days until the error code came back.

The model number of the clock is They are a hot item on eBay. The schematic Since I was in need of a easy to read clock, I decided to make one with this chip. The chip’s absolute maximum power dissipation is mW.

(PDF) LM8560 Datasheet download

The chip can drive the LED display directly. 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. Each of those resistors is responsible for limiting the current on the 2 cathodes.

So when half of the display is on, the other half is off.

Some other details The chip can work with both 50 Hz this is what I used or 60 Hz mains frequency. 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.

These are great clocks and if my lamp had not damaged it, it may have kept running forever. Thanks for your story and all the detail.


The only difficult part was finding a suitable display duplex LED, model S. While the power is out, screen output will also be off. It shouldn’t be too hard to use normal leds instead of a display.

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. Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. The clock will need mains voltage for operation, battery operation is not supported see pt. Info on the code is no longer available. This will prevent oxidation of the copper. It’s best to keep the power consumption to a minimum, especially if discrete LEDs are used for the display for details consult the datasheet available here: The power supplied for each of the display segments is 18 mA.

When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. The one in the picture was cut from a broken floppy disk ribbon cable. The radio still worked, so I moved it to another room and plugged it in.

That being said, here are the schematics and a PCB for the clock: I used a 2 x 6V one, rated at mA so it doesn’t get too hot. 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: I decided it was best to let it go, as the IC chip was most likely damaged.

The maximum input voltage for the chip is V so make sure to use a suitable transformer. But they are fantastic clocks. And it’s old, really old. The brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer.


Without the backup battery, the time will simply reset. Increasing them will minimize overall power consumption and make the datasheett run cooler. The 50 Hz or 60 Hz pulses from the mains are used instead of an external oscillator, probably to keep things simple and thus cheap.

LM Datasheet Unisonic Technologies pdf data sheet FREE from

Newer Post Older Post Home. I played around with it a bit more and it finally started keeping time again. 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 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.

LM Datasheet(PDF) – Sanyo Semicon Device

Parts soldered on the board. Posted by Alex at One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value.

I was lucky to find one in one of the scrap boxes.

I use one on my bedside table. A few days later, I noticed the display blinking on and off.