I don't know if there is a typo or what. My schematic that I pulled out of my
file shows the 22.1K resistor going from pin 6 to 7 and a 1K resistor going
from pin 7 to VCC (pin 8). I don't have any info handy on the 555 timer to
determine whether the other way is correct or just a typo...
Dan
Re: cs> Zappers
From: Robert Berger (view other messages by this author)
Date: Mon, 27 Oct 2003 14:40:07
Thanks Dan,
That LMC555 timer circuit is rather strange. Uusually the timing circuit is
a resistor series between pin 8 - 7- 6 and the Cap from pin 6 to ground.
I got knee relief running 10 Hz rather 30 kHz, and that is safe for the
eyes.
The approved medical TENS unit runs at 10 Hz.
"Ole Bob" P.E., EE
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