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Subject: REQ: reverse polarity squarewave circuit
Date: Mon, 09 Dec 2002 20:20:28 -0000
Organization: Posted via Supernews, http://www.supernews.com
I am doing some copper electroplating. I want to supply a squarewave to
the plating electrodes. I want the squarewave to go positive and
negative. I also want to see both the peak positive and negative
voltages. I would like to be able to adjust the positve and negative Vp.
I know how to get a variable duty cycle from the 555 timer. I would like
a simple way to measure the duty cycle.
I have a 30V 3A Elenco pwr supply. There is a lot of room in the
chassis. I would like to put the circuit inside the chassis. This
supply will be used in a fume hood so I would like to keep it compact and
as sealed as possible.
I have access to every freakin' kind of test equipment there is (this is
an exaggeration but I have lots)
I've drawn a simple circuit. Please see:
I only show one peak reading meter because I was too lazy to draw the
other one but it would be the same.
I used NPN transistors for (drawing) convienience I can use FETs also.
I would appreciate any suggestions you may have, even if it is a
completely different circuit.
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