From: Lizard Blizzard
Subject: Re: Free "TENS" Circuits
Date: Mon, 09 Sep 2002 17:20:35 -0700
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
Gary Lecomte wrote:
> Hi All, Because of a special request from a man in India, I designed a
> low voltage TENS Circuit to help him out. It will operate at as low as
> 2.5 volts from a DC Supply. But I recommend the use of a 3 volt
> battery. It uses a C-mos chip, (CD4011) and No transformer, just a
> coil. Average current draw is also quite minimal.
> For those persons who are interested, It in my "Projects" section at:
I'd like to comment on your speaker matching schem at the following URL
I think it's a poor design to put a source of power to a speaker voice
coil. I've seen speaker cones warp over time, caused by moisture or
just sagging from the weight of the cone. When this happens, the voice
coil can rub against the magnetic gap, and eventually this will cause a
short from the voice coil to the frame. With your circuit this would
cause the battery positive to become shorted to ground if the speaker
frame is grounded, which it usually is. If this happens, then you will
have a burned up voice coil and a potential fire hazard.
It's just not a good idea to connect the battery like it is conneccted
in this schem.
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Incorrect uses: (i) the apostrophe must not be used with a plural
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