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Subject: sine to square wave converter?
Date: Tue, 03 Sep 2002 22:58:30 GMT
NNTP-Posting-Date: Tue, 03 Sep 2002 16:58:30 MDT
Organization: Shaw Residential Internet
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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