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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LM Datasheet Unisonic Technologies pdf data sheet FREE from

Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value.

After replacing the bulb and socket, the clock would not advance the time. I was lucky to find one in one of the scrap boxes. You can also go with a 2 x 7. The only difficult part was finding a suitable display duplex LED, model S. Each of those lm560 is responsible for limiting the current on the 2 cathodes.

Digital Alarm Clock

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. And it’s old, really old.


When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4. I used a 2 x 6V one, rated at mA so it doesn’t get too hot.

Info on the code is no longer available. It’s best to keep the power consumption to a minimum, especially if discrete LEDs are used for the display for details consult the llm8560 available here: Fortunately there’s a simple fix available.

I decided it was best to let it go, as the IC chip was most likely damaged. The advantage of this design is that it allows to use less wires to connect the display to the board.

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The schematic Since I was in need of a easy to read clock, I decided to make one with this chip. So when half of the display is on, the other half is off. I reset the clock and it appeared to have cured itself.

Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder. It also damaged my clock.

(PDF) LM Datasheet PDF Download – Digital Alarm Clock

DrinkTea July 15, at They are no longer sold and GE has no support for them anymore. They are a hot item on eBay. Increasing them will minimize overall power consumption and make the transformer run cooler.

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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. This will prevent oxidation of the copper. This process is repeated fast enough that our eyes see the complete image.

Newer Post Older Post Home. Parts soldered on the board.

According to the datasheet, datashewt it a 4-digit clock IC that uses a duplex LED display to show the time. Without the backup battery, the time will simply reset. From the time stamp, it looks to be made in the third week of That being said, here are the schematics and a PCB for the clock: The power supplied for dataseet of the display segments is 18 mA.

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. The chip’s absolute maximum power dissipation is mW. I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code.