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[Joseph Davis]

A hall sensor is a VR sensor. The hall sensor has on-board circuitry that turns the analog signal into a digital signal. An ECU that supports VR sensors converts the VR's analog sight into a digital one inside of the ECU.

Same shit, different day, only applied to automotive control systems.

[TTC]

AH ok gotcha, so the VR sensor is lacking the circuitry which is found in the edis unit?  I just don't see why we cant just get a 36-1 wheel, a sensor and run the digital signal to the megasquirt.  Want to get rid of the edis unit all together, what about retrofitting a CAS from a nissan or something?

[Joseph Davis]

Uh, you can do just that.

Look up Honeywell hall effect sensors, very inexpenive.

[kgx]

FWIW, cherry corp is pretty good about sample hall sensors. last time i ordered a sample from them (of a sensor that digikey sells for ~$30) they sent me 2.

[Joseph Davis]

I thought Cherry had become ON Semi a few years back?

[kgx]

they may have been acquired by ON semi, but it seems they've kept their name.

http://www.cherrycorp.com/

they still have a sample request form. last time i used it, i used my school email. obviously, it's shitty to abuse such a service, but if you have an idea of what you want to try it's very helpful and the resulting posts about what we've built can generate sales through places like digikey.

i've been looking at using hall sensors to drive the P75 on my MR2. i traced out the logic level signals from the VR conditioning board so i could just bypass the board. the ones i ordered a while ago are too long to fit in the cavity on the 98+ 5SFE oil pump though.

[Joseph Davis]

I wouldn't worry about it.  Your P75's H1C1 board is *very* good at what it does.  Just slap the Honda distributor on there like everyone else and go to.


Also, that's interesting about Cherry... A year or two back I was finding their old P&H driver chips relabelled as ONSemi units.

[kgx]

i did not know they made p&h driver chips. i just always used the LM1949.

i don't have a problem with the distributor, but it does take up more space in the engine bay than i'd like. mostly i'm just looking for easier ways for the conversion to be done. i'd like to develop a board that can turn the denso 24/2 trigger into something the honda ECU can read.

i had even considered using a northstar module since it takes a single cam trigger wheel and multiplexes it out to a 24x and 4x signals, but the coil firing scheme is all wrong.

and it ain't broke, so obviously it needs fixing mostly i just do this stuff to keep my brain moving.

[Joseph Davis]

http://www.datasheetcatalog.org/datasheet/CherrySemiconductor/mXtxuyt.pdf

It's like an LM1949 but with all the supporting circuitry built in.

[HiProfile]

http://www.datasheetcatalog.org/datasheet/CherrySemiconductor/mXtxuyt.pdf

It's like an LM1949 but with all the supporting circuitry built in.

Sounds like four would make an easy DIY circuit. Only problem is - how the hell do you get them? I can't even find info on either Cherry or ON websites, let alone at any small-order dealer.

[Joseph Davis]

There are sites that will let you submit a quote request to several suppliers at once, I was finding them pretty cheap in quantities of ~12 or so.

Jost because it's "obsolete" doesn't mean it doesn't exist on the parts shelf of some supplier, somewhere.

[HiProfile]

If they are obsolete, what's the replacement? Also, what would be the expected price per chip, assuming qty of 12??

[Joseph Davis]

They weren't replaced by anything, you find the old ones. 

re: quotation for CS452 TO-220 CRYSTAL 02+ 24pcs US$1.50each
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 Reply |utsource-quotation to me
show details Jun 13 Reply


Dear Davis Joseph

Did you get our quotation below ?


CS452      TO-220     CRYSTAL        02+    24pcs    US$1.50each



REMARK:
New parts, lead time 1 day, 60 days full quality guarantee, thanks!



If you are interested in our quotation and want to buy, please place order to us below:

PLACE PO NOW !!!    http://www.utsource.net.cn/po.aspx

If you can not click above link, pls email to us: sales@utsource.net




--------------------------------------1. Ship method :-------------------------------------
Post Office: from $8.00 basic shipping fee
DHL/UPS/FEDEX/TNT: from $18.00-$35.00 basic shipping fee

IIRC, utsource was the bidding agency.  I was slack and never did anything.  I think $1.50/unit is VERY fair for such small quantities, but be forewarned I got some $8/per quotes too.


Anyway.  Most modern injectors are high-Z, they get fired by transistor "switches" that simply saturate them.