On 03/15/2015 07:38 PM, asifnathekar wrote:
Hi John
Looking to volunteer
I may have access to an ardiuno guy who may be able to
program the chip with supplied code.
The rest of it I can manage in my spare time
As an experiment I was looking to use my beck blood zapper
to brew the CS with a current limiting diode..
The only thing this circuit does, is to time a cycle of
alternating output polarity. Is the Beck zapper
unidirectional? If so, it it probably easier to rebuild the
entire thing, to have a bidirectional output, than it is to
try to add the bipolar output to the Beck.
My output is just a pair of D flip flops (CD4013BE) hooked
up to a settable clock, as a two bit shift register (first Q
output to second D input), with the second Q bar output fed
back to the first D input. This forces the two flip flops to
generate the following sequence (first bit is first Q,
second bit is second Q)
00
10
11
01
The two phase mode just uses the Q and Q bar outputs from
one of the flip flops (doesn't matter which).
The 4 phase mode (with the idle time between each of the
active polarities) uses the Q output from each flipflop (or
equivalently, the Q bar outputs from each)
Since CMOS gates and flip flops have a fairly symmetrical
output driver, they can sink or source current. For the two
phase output, one output is sourcing, while the other is
sinking, and they take turns.
The 4 phase output sources from one flip flop while sinking
at the other, as long as the two flip flops are in different
states. But when both Qs are high or both low, there is no
voltage difference between them, and the drive goes to zero.
Of course, all this timing could be done by an Arduino,
using two digital outputs as the drive signals, with CMOS
buffers, like CD4049BE or CD4050BE added after, to produce
the cell drive current.
I think precise current control is a lot less important for
reversing polarity drive than it is for continuous DC drive,
because the silver does not just pile up at the cathode, but
sloshes back and forth. As I said in the update, I just
added a 1k resistor in series with each output, but you
could get a lot fancier and add a current regulator, if that
was useful. A simple two transistor or jfet current
regulator, inside a bridge rectifier, and in series with
either output, would make it act like a bidirectional
current regulator. But the diodes and regulator use up a few
useful volts, even at high cell resistance.
--
Regards,
John Popelish
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