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Subject: Re: sine to square wave converter?
References: <3D753EF0.firstname.lastname@example.org> <3D75435A.CDACDFA9@science.net>
Date: Wed, 04 Sep 2002 02:43:05 GMT
NNTP-Posting-Date: Tue, 03 Sep 2002 20:43:05 MDT
Organization: Shaw Residential Internet
can you recommend one that would be best for my application? would
something like a lm311 work? or would another one be best? what would I
need to connect to the IC to have it do this? -the input from my
computer(sine wave), the regualted 5V, and ? and to which pins?
as you can tell I'm still a beginner in much of this so any help or
directions to websites, etc. would also be appreciated.
Issac Asimov wrote:
> Any comparator will do that !
> Joel wrote:
>>hi, I was wondering if anyone knows of a circuit that will take an input
>>of a sine wave of approx .01V-.2V and convert it to a square wave with
>>same frequency and that is approx 5V?
>>currently I have a circuit found here:
>>http://home.att.net/~ralph.hartwell/wavshap2/wavshap2.htm but as others
>>have pointed out,
>>(quote from message I recieved)
>>At the specified input voltage of .6vpp, the absolute maximum (in a
>>negative sense) input input voltage of the LM324 of -0.3v has been
>>exceeded. An op-amp that only just meets spec without any safety factor
>>will be blown out in normal use. A minor concern, since all real op-amps
>>will have some spec margin, but why was this done for no reason? Another
>>1/2 cent on a bias resistor from the (+) input to +5v would have solved
>>Mismatched input resistances give a designed-in uncontrolled offset
>>voltage. Input impedances should be equal to minimize offset voltage.
>>With a gain of 360 and an input voltage of up to 0.6vpp, this op-amp
>>will be heavily saturated. Op-amps don't like to be saturated, and have
>>a slow recovery time. This kind of design calls for a comparitor, not an
>>Four HCT gates to drive one 50 ohm output, but only one to drive the
>>other? Why? The HCT series buffers can source 35ma of current. It takes
>>two of them to drive a 50 ohm load with a 50 ohm source resistor as
>>shown on your schematic. Four is too many and one is too few.
>>The zener diode shunt regulator is more complicated, more expensive,
>>inefficient and noisier than the standard LM309 regulator design.
>>so can you suggest a cicuit that will do much the same thing or suggest
>>ways to improve the circuit found on this page:
>>http://home.att.net/~ralph.hartwell/wavshap2/wavshap2.htm or possibly
>>even give me a new schematic with improvements?
>>any help would be greatly appreciated,
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