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 radio still worked, so I moved it to another room and plugged it in.
A few days later, it started to lose time, but kept running. Fortunately there’s a simple fix available. After replacing the bulb and socket, the clock would not advance datwsheet time.
They are a dataeheet item on eBay. The one in the picture was cut from a broken floppy disk ribbon cable. The chip can drive the LED display directly.
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Datasgeet my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the datashee.
I used a 2 x 6V one, rated at mA so it doesn’t get too hot. Before going further, there are a few things that need to be kept in mind when working with this chip: The clock will need mains voltage for operation, battery operation is not supported see pt.
You can also go with a 2 x 7. This will prevent oxidation of the datashedt. Ready board The next step was to solder all the parts and find a cable to connect the screen.
When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4. I have a small lamp plugged into the same circuit. Each of those resistors is responsible for limiting the current on the 2 cathodes.
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 model number of the clock is Thanks for your story and all the detail.
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. Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder. 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 brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer. The chip’s absolute maximum power dissipation is mW. But they are fantastic clocks. I played around with it a bit more and it finally started keeping time again. DrinkTea July 15, at From the time stamp, it looks to be made in the third week of datasheef So when half of the display is on, the other half is off.
Without the backup battery, the time will datsheet reset. The chip needs a center datasueet transformer for multiplexing the display and also for keeping the time.
One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value. Parts soldered on the board. It also damaged my clock.
LM Datasheet Sanyo pdf data sheet FREE from
The only difficult part was finding a suitable display duplex LED, model S. I decided it lm860 best to let it go, as the IC chip was most likely damaged. And it’s old, really old. According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time.
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The power supplied for each of the display segments is 18 mA. I use one on my bedside table. That lasted a few days until the error code came back. They are no longer sold and GE has no support for them anymore. Posted by Alex at 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: A few days later, I noticed the display blinking on and off. It shouldn’t be too hard to use normal leds instead of a display.
That being said, here are the schematics and a PCB for the clock: I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code. Regarding the display mode, the current build shows the time in military format 24H. I reset the clock and it appeared to have cured itself. Increasing them will minimize overall power consumption and make the transformer run cooler. Some other details The chip can work with both 50 Hz this is what I used or 60 Hz mains frequency.