Automotive VSS Sine to Square &1/2 Needed - Electronic Circuits Projects Diagrams Free

DIY_Stu · 25th February 2008, 05:34 AM

Here's what I have an 80's model GM vehicle with a Vss sine signal coming in

I can supply
VSS
VSS
12V+
GND

I need to convert this 4000 Pulse Per Mile Sine Wave to a Square Wave and output that to a speedometer.
I also need to output a 2000 Pulse Per Mile Square Wave as well. Any Ideas.

picbits · 25th February 2008, 09:24 AM

Use a simple opamp comparator to convert to a square wave.

If the VSS is an AC signal then bunging in a diode before the opamp comparator will give half the pulses per mile.

Diver300 · 26th February 2008, 01:39 AM

You can use a schmitt trigger like a 74HC132 to make the square wave from the sine wave.

A 74HC393 will divide by 4 to give you 2000 pulses per mile.

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25th February 2008, 05:34 AM	(permalink)
DIY_Stu	Automotive VSS Sine to Square &1/2 Needed Here's what I have an 80's model GM vehicle with a Vss sine signal coming in I can supply VSS VSS 12V+ GND I need to convert this 4000 Pulse Per Mile Sine Wave to a Square Wave and output that to a speedometer. I also need to output a 2000 Pulse Per Mile Square Wave as well. Any Ideas.

25th February 2008, 09:24 AM	(permalink)
picbits	Use a simple opamp comparator to convert to a square wave. If the VSS is an AC signal then bunging in a diode before the opamp comparator will give half the pulses per mile.

26th February 2008, 01:39 AM	(permalink)
Diver300	You can use a schmitt trigger like a 74HC132 to make the square wave from the sine wave. A 74HC393 will divide by 4 to give you 2000 pulses per mile.