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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That lasted a few days until the error code came back. Parts soldered on the board. 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 power supplied for each of the display segments is 18 mA.
The chip’s absolute maximum power dissipation is mW. From the time stamp, it looks to be made in the third week of Some other details The chip can work with both 50 Hz this is what I used or 60 Hz mains frequency.
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 4-digit code. It shouldn’t be too hard to use normal leds instead of a display. But they are fantastic clocks. A few days later, it started to lose time, but kept running.
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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: It also damaged my clock. Newer Post Older Post Home. 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: The one in the picture was cut from a broken floppy disk ribbon cable.
When my light bulb burned out with a bright flash due to a bad socket, it tripped the breaker for the whole circuit. The brightness of the display can be adjusted by changing R1 and R2 increase their value to make it dimmer.
I reset the clock and it appeared to have cured itself. The radio still worked, so I moved it to another room and plugged it in.
The schematic Since I was in need of a easy to read clock, I decided to make one with this chip.
Posted by Alex at I decided it was best to let it go, as the IC chip was most likely damaged. The model number of the clock is While the power is out, screen output will also be off.
Without the backup battery, the time will simply reset. I use one on my bedside table. And it’s old, really old. A few days later, I noticed the display blinking on and off. Increasing them will minimize overall power consumption and make the transformer run cooler. They are no longer sold and GE dataseet no support for them anymore.
LM datasheet, Pinout ,application circuits Digital Alarm Clock
Ready board The next step was to solder all the parts and find a cable to connect the screen. The 50 Hz or 60 Hz pulses from the mains are used instead of an external oscillator, probably lm85560 keep things simple and thus cheap. According to the datasheet, it it a 4-digit clock IC that uses a duplex LED display to show the time. When the power is out, the chip will activate an internal Hz oscillator lm860 uses C3 and R4.
Digital Alarm Clock
Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder. This process is repeated fast enough that our eyes see the complete image. I have a small lamp plugged into the same circuit. Arrange it satasheet the photo-sensitive PCB in such way that you can read the text normally through the transparency.
I used a 2 x 6V one, rated at mA so it doesn’t get too hot. I was lucky to find one in one of the scrap boxes. I played around with it a bit more and it finally started keeping time again. Info on the code is no longer available. Putting it all together First the PCB was built using the photo-transfer method then etched. Thanks for your story and all the detail.