LM8560 DATASHEET PDFJune 17, 2020
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 model number of the clock is They are no longer sold and GE has no support for them anymore. But they are fantastic clocks. They are a hot item on eBay. I use one on my bedside table. I have a small lamp plugged into the same circuit.
When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit.
It also damaged my clock. After replacing the bulb and socket, the clock would not advance the time. I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code.
Info on the code is no longer available. The radio still worked, so I moved it to another room and plugged it in. A few days later, I noticed the display blinking on and off.
I reset the clock and it appeared to have cured itself. That lasted a few days until the error code came back. I played around with it a bit more and it finally started keeping time again. A few days later, it started to lose time, but kept running.
I decided it was best to let it go, as the IC chip was most likely damaged. These are great clocks and if my lamp had not damaged it, it may have kept running forever. Thanks for your story and all the detail. And it’s old, really old. From the time stamp, it looks to be made in the third week of According daatasheet the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time. 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.
The schematic Since I was in need of a easy to read clock, I decided to make one with this chip. The only difficult part was finding a suitable display duplex LED, model S. I was lucky to find one in one of the scrap boxes. 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: Datasheeet when half of the display is on, the other half is off.
This process is repeated fast enough that our eyes see the complete image. The advantage of this design is that it allows to use less wires to connect the display to the board. It shouldn’t be too hard to use normal leds instead of a display. And as a plus, you can make it lk8560 big as you wish as long as the the power consumption is held within the chip limits.
Catasheet 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.
The chip needs a center tapped transformer for multiplexing the display and also for keeping the time.
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. One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value.
LM datasheet(5/7 Pages) SANYO | Digital Alarm Clock
This is not much of a problem today, but back in datasheef day especially in eastern Europethe mains had probably around Hz so electronics engineers either avoided using this IC datawheet made separate oscillator blocks with quartz crystals search for 50 Hz timebase circuit. The chip can drive the LED display directly. The power l8560 for each of the display segments is 18 mA. The chip’s lm8506 maximum power dissipation is mW. 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: The maximum input voltage for the chip is V so make sure to use a suitable transformer.
I used datashret 2 x 6V one, rated at mA so it doesn’t get too hot. You can also go with a 2 x 7. That being said, here are the schematics and a PCB for the clock: Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. Some other details The lm5860 can work with both 50 Hz this is what I used or 60 Hz mains frequency. 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.
The brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer. Each of those resistors is responsible for limiting the current on the 2 cathodes. Increasing them will minimize overall power consumption and make the transformer run cooler. When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4. While the power is out, screen output will also be off. Without the backup battery, the time will simply reset.
Regarding the display mode, the current build shows the time in military format 24H. Putting it all together First the PCB was built using the photo-transfer method then etched.
Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder. This will prevent oxidation of the copper. Ready board The next step was to solder all the parts and find a cable to connect the screen. The one in the picture was cut from a broken floppy disk ribbon cable.
Parts soldered on the board.
Posted by Alex at DrinkTea July 15, at Newer Post Older Post Home. Fortunately there’s a simple fix available.