Sine to Square - more info
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I forgot to say that the signal I need to convert comes from a variable
reluctance pickup and hence can range form mV to tens of volts.
Is that going to make a big difference to what I am trying to do?
Original Message
From: "Tim Stockman" <tim.stockman@s...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, July 22, 2003 10:29 PM
Subject: [noparse][[/noparse]basicstamps] Sine to Square
> Whats the easiest waht to convert a low frequency sine (10-100hz) to a
square wave? Opamps or a comparator?
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reluctance pickup and hence can range form mV to tens of volts.
Is that going to make a big difference to what I am trying to do?
Original Message
From: "Tim Stockman" <tim.stockman@s...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, July 22, 2003 10:29 PM
Subject: [noparse][[/noparse]basicstamps] Sine to Square
> Whats the easiest waht to convert a low frequency sine (10-100hz) to a
square wave? Opamps or a comparator?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Comments
>reluctance pickup and hence can range form mV to tens of volts.
>Is that going to make a big difference to what I am trying to do?
>
>
Original Message
>From: "Tim Stockman" <tim.stockman@s...>
>To: <basicstamps@yahoogroups.com>
>Sent: Tuesday, July 22, 2003 10:29 PM
>Subject: [noparse][[/noparse]basicstamps] Sine to Square
>
>
>> Whats the easiest waht to convert a low frequency sine (10-100hz) to a
>square wave? Opamps or a comparator?
> >
One chip that is meant specifically for use with reluctance pickups
is the old LM2917. It is a tachometer IC that can output a voltage
proportional to input frequency. But if you leave off the
"integration" capacitor, it will output a series of pulses at a rate
of twice the sine wave input frequency. Those are pulses that can be
counted by the BASIC Stamp. It is not a symmetrical square wave, if
that is indeed what you need. The hysteresis is about 5 millivolts
at the input, I think.
-- Tracy