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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When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4. The radio still worked, so I moved it to another room and plugged it in.

The 50 Hz or 60 Hz pulses from the mains are used instead of an external oscillator, probably to datasheey things simple and thus cheap. Datazheet by Alex at 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 reset the clock and it appeared to have cured itself.

The only difficult part was finding a suitable display duplex LED, model S.

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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.

But they are fantastic clocks. The power supplied for each of the display segments is 18 mA. The advantage of this design is that it allows to use less wires to connect the display to the board.


If you have one of those clock radios from back in the day, it most likely uses a variant of this chip l,8560 maybe a Chinese knock-off. Thanks for your story and all the detail.

Each of those resistors is responsible for limiting the current on the 2 cathodes.

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.

LM Datasheet Sanyo pdf data sheet FREE from

They are no longer sold and GE has no support for them anymore. The clock will datashet mains voltage for operation, battery operation is not supported see pt.

That being said, here are the schematics and a PCB for datashet clock: The chip can drive the LED display directly. And as a plus, you can make it as big as you wish as long dataeheet the the power consumption is held within the chip limits.

According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time. 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: Without the backup battery, the time will simply reset. When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit.

I decided it was best to let it go, as the IC chip was most likely damaged. A few days later, I noticed lm8650 display blinking on and off.


(PDF) LM Datasheet PDF Download – Digital Alarm Clock

The model number of the clock is I use one on my bedside table. Regarding the display mode, the current build shows the time in military format 24H. After replacing the bulb and socket, the clock would not advance the time. Before going dataasheet, there are a few things that need to be kept in mind when working with this chip: The schematic Since I was in need of a easy to read clock, I decided to make one with this chip.

The brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer. DrinkTea July 15, at I was lucky to find one in one of the scrap boxes. I have a small lamp plugged into the same circuit. That lasted a few days until the error code came back. Fortunately there’s a simple fix available. This process is repeated fast enough that our eyes see the complete image. A few days later, it started to lose time, but kept running. From the time stamp, it looks to be made in the third week of So when half of the display is on, the other half is off.