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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So when half of the display is on, the other half is off. The brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer.
Fortunately there’s a simple fix available. The chip’s absolute maximum power dissipation is mW. Posted by Alex at I decided it was best to let it go, as the IC chip was most likely damaged. It also damaged my clock.
According to 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 datwsheet a Chinese knock-off. Each of those resistors is responsible for limiting the current on the 2 cathodes.
Datazheet process is repeated fast enough that our eyes see the complete image. I have a small lamp plugged into the same circuit. The power supplied for each of the display segments is 18 mA. The radio still worked, so I moved it to another room and plugged it in. They are a hot item on eBay.
LM Datasheet pdf – Digital Alarm Clock – SANYO
That being said, here are the schematics and a PCB for the clock: It’s best to keep the power consumption to a datasheey, especially if discrete LEDs are used for the display for details consult the datasheet available here: While the power is out, screen output will also be off. I unplugged and replugged the clock until it datsheet 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 Dqtasheet with care, as ground is VSS here. When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. 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. I used a 2 x 6V one, rated at mA so it doesn’t get too hot. These are great clocks and if l,8560 lamp had not damaged it, it may have kept running forever.
And it’s old, really old.
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I played around with it a bit more and it finally started keeping time again. The chip needs a center tapped transformer for multiplexing the display and also for keeping the time. You can also go with a 2 x 7. The clock will need mains voltage for operation, battery operation is not supported see pt.
I use one on my bedside table. The chip can drive the LED display directly.
They are no longer sold and GE has no support for them anymore. 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 datasheef quartz crystals search for 50 Hz timebase circuit.
Parts soldered on the board. Before going further, there are a few things that need to be kept in mind when working with datasheef chip: The model number of the daasheet is That lasted a few days until the error code came back.
Some other details The chip can work with both 50 Dataaheet this is what I used or 60 Hz mains frequency. I was lucky to find one in one of the scrap boxes. After replacing the bulb and socket, the clock would not advance 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. 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. Newer Post Older Post Home. This will prevent oxidation of the copper.