[Diy_efi]clarify: function generator for shutterwheel

[don.broadus at exeloncorp.com]

That is a great idea. I did a similar thing with a 2716 EPROM making a pattern generator.
The nice thing about waveform/pattern generators is that you can set the cycle delay. I used a
NVRAM for debug then burned a 2716.  Preset binary counters for addresses, buffers for the data bits.  



-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
Sent: Thursday, December 29, 2005 3:46 AM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi]clarify: function generator for shutterwheel


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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