Groundhog Day Alarm Clock





Introduction: Groundhog Day Alarm Clock

About: My name is Randy and I am a Community Manager in these here parts. In a previous life I had founded and run the Instructables Design Studio (RIP) @ Autodesk's Pier 9 Technology Center. I'm also the author ...

The Groundhog Day Alarm Clock consists of a Panasonic RC-6025 flip clock modified to play the audio from the movie Groundhog Day when the alarm goes off.

The reason I have created this device is because Groundhog Day (both the day and film) held special meaning for me because I first met my ex-partner-in-crime on February 2nd. This device was built to commemorate the 10th anniversary of our time together. I felt what better way to commemorate it than by recreating a heavily symbolic object from such an iconic movie?

After all, being in a long-term relationship can seem a bit like living the same day over and over and over and over and over -- every time with different consequences. Every morning you wake up with the same sense of existential dread, and simply try to live through the same set of scenarios again. To remind her of the 10 wonderful years of our existential abyss I made her this clock which will awaken her to the same recording every morning. Perhaps not as pleasant of a wake up greeting as the alarm clock underwear I had previously made for her, I nevertheless hoped that she would appreciate the thoughtfulness of the gift.

However, we parted ways shortly thereafter, and now I am the sole owner of this somewhat annoying clock. I'm not particularly sure what to do with it. I guess I could just mail it to Bill Murray. Anyone have his address?

Step 1: Go Get Stuff

Step 2: Take Off the Top

Make certain the alarm clock is unplugged before you do anything.

Pull off all of the knobs, and then remove the screws from the underside of the alarm clock to free the top plastic cover.

Remove the screws holding the speaker in place to seperate the top section from the bottom.

Step 3: Free the Electronics

Remove the screws holding the circuit board to the base of the clock and gently set it aside.

Next, remove the screws holding the power transformer in place.

Finally, free the slip clock mechanism by removing the screws from the underside of the case that is holding it in place.

Step 4: Change the Bulb

The bulb inside the alarm clock is meant to last 5-8 years. The clock itself is likely 30 years old at this point. Thus, you will almost certainly need to replace the front bulb.

Cut the wires holding the bulb in place.

Slide shrink tube onto the remaining wires, and then solder a new 12V replacement bulb in place.

If it does not happen to fit snuggly into the blue plastic bulb holder, use a drop of hot glue to keep it in position.

Step 5: Clip the Speaker

Cut the speaker free from the circuit board.

Step 6: Hack the Board

Attach a 6" red wire to the spot on the circuit board conveniently marked with a plus sign.

Attach a 6" black wire to the spot in the circuit board conveniently marked with a minus sign.

Attach a 6" white wire to the leg of the 100 ohm resistor that is closest to the edge of the flip clock board.

Step 7: Put Everything Back in Place

Fasten the flip clock mechanism, transformer, and circuit board back to the clock's plastic base.

Step 8: Program the Board

Plug the Audio FX board into the computer. It should show up like a typical flash drive.

Download the attached audio file and load it onto the Audio FX board by copying it onto the drive.

Make certain the name of the file remains precisely "T01.ogg"

Step 9: Build the Circuit

Attach the heat sink to the 7805 voltage regulator and then put together the circuit as specified in the schematic.

Step 10: Put It Inside

Put the audio FX board and the new circuit board inside the case and fasten everything safely in place with zip ties.

Step 11: Back Together

Put the case back together, fasten it shut, and put all of the knobs back in place.

Step 12: Set the Clock

Turn the dial on the top of the clock to "Auto" and then set the alarm clock to whatever time you wish by turning the dial on the side of the clock.

Plug it in and you are good to go and go and go and go and go and go...



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2 Questions

Is there anywhere that i can purshase the Ground Hod Day clock already made?


You can try Ebay. I sometimes see them on there, or people selling the service of modifying your existing clock.

Is the schematic wrong, or are the photos? The wiring of the relay is not the same in both: the black (ground) wire in the photo that goes from the ground rail at column 28 should go to G/H/I/J in column 27, should it not? Where does the photo show it going? Looks like E28, which doesn't make sense.


Done! Just before 10 PM on February 1... so, with 8 hours to spare. Thanks, randofo, for the revised schematic image. Resoldered to make that quick change, et voila: works like a charm!

The link to the 12V 50mA incandescent bulb no longer brings up any results at Radio Shack, and I'm terrible at electronics. Got any further distinguishing information, such that I could buy a direct replacement or an LED equivalent online (at DigiKey, say)?

Can anyone suggest an alternative for the Adafruit Audio FX Sound Board?

I have the clock and the other parts, but that one has been out of stock for months, and it this point I'm starting to doubt whether it's coming back. I don't really know enough about this sort of thing to feel confident picking substitute myself, so any help would be really appreciated.


1 reply

Ever find an alternative to the adafruit sound board? they are discontinued.

I have tried to create this however the RC-6025 keeps terrible time in the UK due to the different voltage. Any idea how to resolve this? Was there a European version I could buy and change parts so it still looked the same from the outside but was functional in the UK? Thanks

1 reply

Ever find a solution? I live in the UK and bought this for the same reason and am also stuck on how to get around the voltage problems!

I've completed the modifiction to the RC-6025, but the volume is very weak. There is not an obvious volume adjustment in the circuit. How do I increase the volume of the speaker? Is there something I should consider on the Audio Card?

3 replies

To double check - Did you get an amplified Audio FX board? They sell some without amplifiers.

If so, there is a volume + pin on the board. By connecting this pin to ground, you should be able to gradually raise the volume. This will have to be re-done every time the board is powered on.

See here:


If i connect the Vol + pin to ground than how does this gradually increase the volume? Is this gradual increase come from opening the + to GND circuit until the desired volume is achieved? or just maintaining the circuit until the volume increases? I might not have the best board for this application. I ordered a second board that might be better. The one i have has a stereo jack


Yes. You ordered one without an amplifier. It has a stereo (line level) output jack instead. This is not enough to drive a speaker.

Anyhow, Every time the pin gets connected to ground, the volume goes up a little. It is like pressing a button on a cheap digital MP3 player (which essentially is what it is). Every time you press the button (i.e. connect the pin to ground), the volume goes up a little.

Thanks for this, Randofo! I just finished building one of these. It's a great idea that's not too difficult to build. I ran into problems with the relay, but quickly resolved. I'm going to give this as a gift to someone that loves the movie. This will be a HUGE hit.

Even better though, was being introduced to the Adafruit board - thanks! That thing ROCKS! I'll be using these in other projects!

1 reply

How did you control the volume of the speaker?

I bought a similar alarm clock from a yard sale; I would have died laughing if "I've Got You Babe" was the first song it played when I plugged it in.


Unitl watch the video third minute, I realized that it's a cycle .......... amazing creativity! (beginning to worry my IQ)

This is a brilliant idea. If you want to jump down the rabbit hole even further, drive the split-flap display with an Arduino that controls the alarm separately. Then have it shift the time based on the alarm so the clock always goes off at 6AM, no matter what the real time is.

Complicated? Yes. But you have 10,000 years to do it! :)

I would add a feature where you can smash it with your fist to turn it off.


Love your promo video and those sewing machines in the background.

This is great! Awesome movie, awesome instructable, hilarious video. I had to watch the video for just a few seconds until I just burst out laughing when I realized what you did. SO funny. Great job as usual!