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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This process is repeated fast enough that our eyes see the complete image. Parts soldered on the board. The model number of the clock is 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 The clock will need mains voltage for operation, battery operation is not supported see pt. 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 power supplied for each of the display segments is 18 mA.
The one in the picture was cut from a broken floppy disk ribbon cable. Fortunately there’s a simple fix available.
Thanks for your story and all the detail. Ready board The next step was to solder all the parts and find a cable to connect the screen.
LM Datasheet pdf – Digital Alarm Clock – SANYO
These are great clocks and if my lamp had not damaged it, it may have kept running forever. So when half of the display is on, the other half is off.
Regarding the display mode, the current build shows the time in military format 24H. I unplugged and replugged the clock until it finally displayed what looked like a datahseet code.
LM datasheet, Pinout ,application circuits Digital Alarm Clock
And it’s old, really old. While the power is out, screen output will also be off. 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.
I use one on my bedside table. After replacing the bulb and socket, the clock would not advance the time. It shouldn’t be too hard to use normal leds instead of a display.
I reset the clock and it appeared to have cured itself. The chip’s absolute maximum power dissipation is mW.
(PDF) LM8560 Datasheet download
I have a small lamp plugged into the same circuit. Info on the code is no longer available. The only difficult part was finding a suitable display duplex LED, model S. Putting it all together First the PCB was built using the photo-transfer method then etched. Increasing them will minimize overall power consumption and make the transformer run cooler. 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.
You can leave pin 26 disconnected for 60 Hz, or leave it grounded to use it dafasheet 50 Hz with care, as ground is VSS here. That lasted a few days until the error code came back. The maximum input voltage for the chip is V so make sure to use a suitable transformer.
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But they are fantastic clocks. This will prevent oxidation of the copper. Arrange it over the photo-sensitive PCB in such way that you can read the text normally through the transparency.
When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. They are no longer sold and GE has no support for them anymore.
The radio still worked, so I moved it to another room and plugged it in. I was lucky to find one in one of the scrap boxes. You can also go with a 2 x 7. When the power is out, the chip will activate an internal Hz oscillator that uses C3 and R4.