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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It shouldn’t be too hard to use normal leds instead of a display. The power supplied for each of the display segments is 18 mA. The maximum input voltage for the chip is V so make sure to use a suitable transformer.

I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code. 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. That lasted a few days until the error code came back. 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: 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.

And it’s old, really old. It also damaged my clock. The clock will need mains voltage for operation, battery operation is not supported see pt. They are a hot item on eBay. Info on the code is no longer available.

Digital Alarm Clock

The chip’s absolute datashete power dissipation is mW. According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time. But they are fantastic clocks. 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. The one in the picture was cut from a broken floppy disk ribbon cable.

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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. 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 dataseet Hz timebase circuit.

LM Datasheet pdf – Digital Alarm Clock – SANYO

I reset the clock and it appeared to have cured itself. When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit.

While the power is out, screen output will also be off. The model number of the clock is Each satasheet those resistors is responsible for limiting the current on the 2 cathodes. Without the backup battery, the time will simply reset. The only difficult part was finding a suitable display duplex LED, model S. They are no longer sold and GE has no support for them anymore.

I have a small lamp plugged into the same circuit. These are great clocks and datxsheet my lamp had not damaged it, it may have kept running forever. A few days later, I noticed the display blinking on and off. After replacing the bulb and socket, the clock would not advance the time. The radio still worked, so I moved it to another room and plugged it in. I use one on my bedside table. I played around with it a bit more and it finally started keeping time again.

Fortunately there’s a simple fix available.

lm datasheet & applicatoin notes – Datasheet Archive

Increasing them will minimize overall catasheet consumption and make the transformer run cooler. 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 dtaasheet accurate as these oscillations are close to the rated value. Parts soldered on the board. When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4.

Dataeheet when half of the display is on, the other half is off. The advantage of this design is that it allows to use less wires to connect the display to the board. That being said, here are the schematics and a PCB for the clock: The datazheet of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer. Regarding the display mode, the current build shows the time in military format 24H. Posted by Alex at The schematic Since I was in need of a easy to read clock, I decided to make one with this chip.

DrinkTea July 15, 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: Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the satasheet with solder. Before going further, there are a few things that need to be kept in mind when working with this chip: Thanks for your story and all the detail.

From the time stamp, it looks to be made in datxsheet third week of