My house is located where there are a lot of stray dogs in the area. One day when we came home we found dogs lying next to entrance of our house where it was cool and shady and in the process, there was a lot of dog’s poop and pee. It really smelled bad and it was disgusting.

When I was in the states I bought a dog repeller and it was a hand held device. I keep that device in my car and use it when it was necessary. As we were coming home and saw all the mess, an idea came to my mind of modifying a hand held dog repeller into a stationary one.

Because it is a hand held device, it was not made to be used for a long time because the 9 volts battery will drain fast. It will run about five minutes then it will stop.

I have to shut it off for a while then it will work again. The other problem was the push button. I have to keep pushing the button to make it work.  With that in mind, let us start the modification on this device.

As you can see in this photo, the power source and the two push buttons, one for training and one for repelling; this where the modification comes in.

I started with the bush button which is on the right of the photo and I connected a line across it terminals to make it active all the time.

As you can see, the light came on and it was working fine. Next step was the power source modification.

I am using a 9 Volt DC transformer with half amp rating. I de soldered the two battery connection off the board and I replaced them with the transformer input connections.

The modification of the device was done. I tried it out in the shop for almost three hours and it was on all the time.

The reason I tested it out in my shop because since it was made to be used for a short time on battery, I just wanted to make sure it can handle the long duration of work and it did well

The dogs have a big surprise waiting for them in my area. I hope that will be the end of dog smell and poop near my house. Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/an-intermittent-problem-with-a-salon-hair-styler-repaired