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 one in the picture was cut from a broken floppy disk lm8506 cable. 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.

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.

LM Datasheet Unisonic Technologies pdf data sheet FREE from

That lasted a few days until the error code came dataeheet. It also damaged my clock. Posted by Alex at 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. 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. The model number of the clock is Without the backup battery, the time will simply reset.


The advantage of this design is that it allows to use less wires to connect the display to the board. I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code.

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

Digital Alarm Clock

These are great clocks and if my lamp had not damaged it, it may have kept running forever. The chip’s absolute maximum power dissipation is mW. I used a 2 x 6V one, rated at mA so it doesn’t get too hot. 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.

It shouldn’t be too hard to use normal leds instead of a display. Fortunately there’s a simple fix available. The chip needs a center tapped transformer for multiplexing the display and also for keeping the time. A few days later, it started to lose time, but kept running. One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value.

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. You can also go with a 2 x 7. While the power is out, screen output will also be off.

That being said, here are the dataseet and a PCB for the clock: They are a hot item on eBay.

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The chip can drive the LED display directly. Thanks for your story and all the detail. 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: I decided it was best to let it go, as the IC chip was most likely damaged. 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.


Newer Post Older Post Home. Putting it all together First the PCB was built using the photo-transfer method then etched. The radio still worked, so I moved it to another room and plugged it in.

The schematic Since I was in need of a easy to read clock, I decided to make one with this chip. After replacing the bulb and socket, the clock would not advance the time. From the time stamp, it looks to be made in the third week of Parts soldered on the board. Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. Each of those resistors is responsible for limiting the current on the 2 cathodes.