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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From the time stamp, it looks to be made in the third week of Ready board The next step was to solder all the parts and find a cable to connect the screen. They are a hot item on eBay. Fortunately there’s a simple fix available. This will prevent oxidation of the copper. Info on the code is no longer available. The chip needs a center tapped transformer for multiplexing the display and also for keeping 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.
Dataxheet schematic Since I was in need of a easy to read clock, I decided to make one with this chip.
Digital Alarm Clock
One disadvantage of this design is that the clock will only be as accurate as these oscillations are close to the rated value.
Before going further, there are a few things that need to be kept in mind when working with this chip: Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency. 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.
While the power is out, screen output will also be off. Etching the board After om8560 cleaning, I used a small piece of expended desoldering braid to cover the traces with solder. So when half of the display is on, the other half is off.
And it’s old, really old. It’s datsaheet to keep the power consumption to a minimum, especially if discrete LEDs are used for the display for details consult the datasheet available here: You can also go with a 2 x 7. These are great clocks and if my lamp had not damaged it, it may have kept running forever.
The clock will need mains voltage for operation, battery operation is not lm85560 see pt. I unplugged and replugged the clock until it finally displayed what looked like a 4-digit code. Posted by Alex at A few days later, I noticed the display blinking on and off.
LM Datasheet pdf – Digital Alarm Clock – SANYO
That being said, here are the schematics and a PCB for the clock: I was dtaasheet to find one in one of the scrap boxes. The chip can drive the LED display directly. 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. I use one on my bedside table. 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 ddatasheet crystals search for 50 Hz timebase circuit.
(PDF) LM8560 Datasheet download
This process is repeated fast enough that our eyes see the complete image. I used a 2 x 6V one, rated at mA so it doesn’t get too hot. The only difficult part was finding a suitable display duplex LED, model S.
It shouldn’t be too hard to use normal leds instead of a display. Parts soldered on the board. I decided it was best to let it go, as the IC chip was most likely damaged.
Putting it all together First the PCB was built using the photo-transfer method then etched. The advantage of this design is dayasheet it allows to use less wires to connect the display to the board. They are no longer sold and GE has no support for them anymore. The chip’s absolute maximum power dissipation is mW. Without the backup battery, the time will simply reset. Increasing them will minimize overall power consumption and make the transformer run cooler.
DrinkTea July 15, at Dahasheet 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: According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time.
That lasted a few days until the error code came back. The power supplied l8m560 each of the display segments is 18 mA.
I have a small lamp plugged into the same circuit.
The model number of the clock is It also damaged my clock. The one in the picture was cut from a broken floppy disk ribbon cable.
When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4.