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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
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Old 22nd July 2018, 07:49 PM   #91
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
XA25 is for Sissies



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Old 23rd July 2018, 02:36 AM   #92
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
I am struggling to follow that data sheet for the hall effect sensor...

I think I'm going to have to sim that part of the circuit so I can see how the summed output ends up turning on the opto.

I would have thought the output of the two hall sensors would be equal at any bias point meaning that node at R15,16,17 is (roughly) at zero?
Possibly not scanning at work will help...

Last edited by aspringv; 23rd July 2018 at 02:45 AM.
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Old 23rd July 2018, 05:39 AM   #93
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think of it as of well balanced see-saw , when in idle horizontally

tip: pivot can be adjusted in height by age of riders
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Old 23rd July 2018, 12:07 PM   #94
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
I get it I think. The two sensors generate a positive voltage and then you're applying a part of that voltage to the opto via the voltage divider.

What's the zener for? Protection? :Scratches head:
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Old 23rd July 2018, 01:59 PM   #95
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peace of mind

if from any reason ACS goes berserk , everything will end in flames - amp , speakers , house , street , town ....... but optocoupler will survive , protected with zener on input




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Old 23rd July 2018, 02:03 PM   #96
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not really necessary ..... mostly artifact from Papa's original M2 , where spikes and asymmetry of voltage across source resistors (feeding optocoupler) are more possible to happen , than in this case - fed with Hall chips

hey , be my guest .... do not solder it in circuit ..... it'll be fine
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Old 24th July 2018, 05:36 AM   #97
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
No, just working out if I'm clever enough to stumble along after the mighty ZM.

I'm also trying to work out if I can design a few modules that will allow the hall sensors etc to be 'bolted on' to an existing M2 PCB.

After -that- I've had a hankering to do an X something something and combining the bias and out put with the front end from that would be a loooong interesting project.
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Old 24th July 2018, 10:10 AM   #98
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just be persistent ......
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Old 26th July 2018, 01:13 PM   #99
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
Trade thread here :

Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd - kit packages
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Old 27th July 2018, 10:36 AM   #100
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as just written in trade thread :


Sadly ( or not ) , no Harris ; not trustworthy purchase possible , so I'll skip

as I said - not so important in source follower arrangement and , besides that , I like some lush Vishays are giving , even if that's really hard to hear

well , old .... fart .... geezer ..... ears .....

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