[Diy_efi]clarify: function generator for shutterwheel

[Torbjörn Forsman]

Yes, indeed, today a PIC would be a good alternative but as i built that 
circuit some ten years ago, it was then more appropriate to use standard 
logic circuits.

/Torbj?rn Forsman

Ashley Evans wrote:
> I was thinking this could be easily done with a PIC Microcontroller.
> 
> Ashley
> 
> Torbj?rn Forsman wrote:
> 
>> I once built a such waveform generator by using a presettable binary 
>> counter to set the number of cycles between the pauses, some logic 
>> gates and a final stage with an op amplifier and a modem line 
>> transformer (in my case, an inductive pickup was to be simulated). The 
>> final stage is of course not needed if a hall sensor with open 
>> collector output is to be simulated. The input signal for this circuit 
>> was taken from a standard tone generator.
>>
>> /Torbj?rn Forsman
>>
>> Phil wrote:
>>
>>> some clarification about what I need to simulate the crank sig for VW 
>>> ABA eng, OBD I ECM: a 60 cycle sequence with the last 2 cycles off; 
>>> a  3V square wave is sufficient; and I need to be able to vary the 
>>> frequency from 6oo-7500Hz (individual square wave cycles)  ----- 
>>> Original Message ----- From: "Adam Wade" <espresso_doppio at yahoo.com>
>>> To: <diy_efi at diy-efi.org>
>>> Sent: Wednesday, December 28, 2005 9:15 AM
>>> Subject: Re: [Diy_efi] function generator for shutterwheel
>>>
>>>
>>>> --- Bill Shaw <b.shaw at comcast.net> wrote:
>>>>
>>>>> Analog Devices makes  some function generator chips.
>>>>> Here's a link to an app note with schematics....
>>>>
>>>>
>>>>
>>>> Unfortunately, mail programs peark up that cumbersome
>>>> URL.  Since you don't really care it came from a
>>>> particular search, or where the search was done, you
>>>> might find it easier to just click on this link, which
>>>> should be intact...
>>>>
>>>> <http://www.analog.com/UploadedFiles/Application_Notes/724445866AN285.pdf> 
>>>>
>>>>
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>>>>
>>>>
>>>>
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>>>
>>>
>>>
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