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 process is repeated fast enough that our eyes see the complete image. The one in the picture was cut from a broken floppy disk ribbon cable. That being said, here are the schematics and a PCB for the clock: When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4.

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

Before going further, there are a few things datashedt need to be kept in mind when working with this chip: One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value. Newer Post Older Post Home.

If you have one of those clock radios from back in the day, it most likely uses a variant pm8560 this chip or maybe a Chinese knock-off. DrinkTea July 15, at I have a small lamp plugged into the same circuit. The chip can drive the LED display directly. The maximum input voltage for the chip is V so make sure to use a suitable transformer.


I reset the clock and it appeared to have cured itself.

According to the datasheet, it it a 4-digit clock IC that uses a om8560 LED display to show the time. Regarding the display mode, the current build shows the time in military format 24H.

Some other details The chip can work with both 50 Hz this is what I used or 60 Hz mains frequency. I played around with it a bit more and it finally started keeping time again. They are no longer sold and GE has no support for them anymore. So when half of the display is on, the other half is off. Ready board The next step was to solder all the parts and find a cable to connect the screen.

Thanks for your story and all the detail. Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency.

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. The radio still worked, so I moved it to another room and plugged it in.

The advantage of this design is that it allows to use less datashet to connect the display to the board. This will prevent oxidation of the copper. A few days later, I noticed the display blinking on and off. They are a hot item on eBay. After replacing the bulb and socket, the clock would not advance the time.


The 50 Hz or 60 Hz pulses from the mains datashet used instead of an external oscillator, probably to keep things simple and thus cheap. You can also go with a 2 x 7. The brightness of the display can be adjusted by changing R1 and R2 increase their value to lm5860 it dimmer.

The power supplied for each of the display segments is 18 mA. I used a 2 x 6V one, rated at mA so it doesn’t get too hot.

Digital Alarm Clock

It also damaged my clock. A few days later, it started to lose time, but kept running. 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. Info on the code is no longer available.

Posted by Alex at The chip needs a center tapped transformer for multiplexing the display and also for keeping the time.

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