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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The brightness of the display can be adjusted daatsheet changing R1 and R2 increase their value to make it dimmer. Ready board The next step was to solder all the parts and find a cable to connect the screen. Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder.

LM datasheet(5/7 Pages) SANYO | Digital Alarm Clock

This process is repeated fast enough that our eyes see the complete image. Regarding the display mode, the current build shows the time in military format 24H. I decided it was best to let it go, as the IC chip was most likely damaged. I used a 2 x 6V one, rated at mA so it doesn’t get too hot. A few adtasheet later, it started to lose time, but kept running. Without the backup battery, the time will simply reset.

Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. The chip can drive the LED display directly. This is not much of a problem today, but back in the day especially dahasheet 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.


One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value. 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.

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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. While the power is out, screen output will also be off. When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4. From the time stamp, it looks to be made in the third week of The one in the picture was cut from a broken floppy disk ribbon cable.

Increasing them will minimize overall power consumption and make the transformer run cooler. They are a hot item on eBay. I was lucky to find one in one of the scrap boxes. The chip’s absolute maximum power dissipation is mW.

I unplugged and replugged the clock lm85560 it finally displayed what looked like a 4-digit code. Info on the code is no longer available. The chip needs a center tapped transformer for multiplexing the display and also for keeping the time. I reset the clock and it appeared to have cured itself. Before going further, there are a few things that need to be kept in mind when working with this chip: They are no longer sold and GE has no support for them anymore. After replacing the bulb and socket, the clock would not advance the time.


According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time. 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: A few days later, I noticed the display blinking on and off.

I have a datsaheet lamp plugged into the same circuit. Parts soldered on the board.

So when half of the display is on, the other half is off. When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. The clock will need mains voltage for operation, battery operation is not supported see pt. 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. The radio still worked, so I moved it to another room and plugged it in.

I played around with it a bit more and it finally started keeping time again. The only difficult part was finding a suitable display duplex LED, model S.