Good day.Mr Yogesh this article is great for newbies like me.I built it but don't know how to use it,can you kindly explain to a level that I can I stand please.

Likes(0)Dislikes(0)

And if you have a Philips HP510/A electric toothbrush it probably is exactly the same useable device for a signal injector. Mine works fine with the original 1.2V Toothbrush battery and charger. No need for 3V DC supply.

Likes(0)Dislikes(0)

But for putting a led to work on the mentioned Philips ex electrical-toothbrush as indicator you'll probably need a little Joule-thief circuit in order to pep up the low 1.2V NiMH/NiCAD voltage to about 1.8V before the Led will work. Or a small voltage step-up converter chip.

Likes(0)Dislikes(0)

If you have a Philips model HP735/A electronic toothbrush (200-240VAC charger model) at home with a worn out motor it is ideal for making a recheargable audio-signal-injector with it.

The electronic controller board that drives the motor even can be used to switch on/off the signal injector board. Just remove the bad useless motor and use the injector board in its place! You only have to add a ground connector pin on the outside to connect it to the gnd pin of your audio device under test. But that is easy because the ground bolt with screwnut fits just fine when you drill a hole on the sides where the inside plastic leaves the most space. And it works great. (I know because I made one!).

Likes(0)Dislikes(0)

Thanks Humberto.

Likes(0)Dislikes(0)

Ramli,

Thanks for the comment.

Likes(0)Dislikes(0)

Matsuokai,

Thanks for sharing your experience.

Likes(0)Dislikes(0)

Thank you sir.

Likes(0)Dislikes(0)

Romeo,
No need additional LED. if you have in build speaker in audio system then you will get the buzz sound from the same speaker because you are injecting the signal through this device.

Likes(0)Dislikes(0)

Mahmoud Tajpour,

Congratulations!

Likes(0)Dislikes(0)