This Hongjian mosquitoes killer was brought to me by a neighbour with complaint of not working. Few months ago, it was repaired changing LEDs only.
Now back on my work bench. I did troubleshoot, found the non-polar caps & LEDs are dead and I couldn’t get the values, sizes from store.
The picture of the original board below:
So I decided to build another circuit for it, googled on internet how to DIY on mosquitoes killer which I located one.
However the caps for this DIY are bigger in size than original ones, so I thought of modifying it. I bought all components for building DIY, soldered all on a small sized bread board, following instruction, picture below:
However,circuit board couldn’t fix into original case,so I used a discarded table lamp base(red colour), then connected it to original case (white & green colour).Connected A/C cord to it, having removed original switch. Now it’s moment of truth!!.
Plugged completed DIY into A/C socket, put housefly into it, see what happens, electrocuted with smoke!! Picture below(zoom to see smoke):
I measured voltage at iron mesh terminals: 700 Volt, very high and dangerous!! Well, my neighbour was happy and mosquitoes are again in trouble.
Please keep children away from such appliance and best use at night. This is picture of finished repaired work below:
This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.
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