missing parts

[legend069]

hello i tried to make this, but it seems i'm missing the two black chips(unsure of what part number)

can you let me know what they are so i can order solder on?

thanks.

[zapta]

I got them from this Aliexpress vendor. The price went up three times now due to the global semiconductor shortage but still available

https://www.aliexpress.com/item/4001123087424.html

On Sun, Oct 17, 2021 at 1:50 AM legend069 @.***> wrote:

hello i tried to make this, but it seems i'm missing the two black chips(unsure of what part number) [image: Fusion360_Aqfch81uV6] https://user-images.githubusercontent.com/40685552/137619521-4b0ec535-0500-4f66-a3bf-77be025f44fa.png

can you let me know what they are so i can order solder on?

thanks.

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[legend069]

thanks for that. found this one on digikey but it is out of stock :(

is below the spec required?

Current Sensor 2.5A 1 Channel Hall Effect, Open Loop Bidirectional 8-SOIC (0.154", 3.90mm Width) Voltage - Supply | 3V ~ 4.5V

[pbinsted]

After having two orders not show up / cancelled I ordered from Zapta's link above and just got confirmation it has shipped. Thank you for the link.

Pete

[zapta]

I had several orders from that Aliexpress store and in all cases the current sensors work as expected.

I had a bad experience with another Ali store when I order similar sensors (+/- 5A) and got fake ICS that didn't work (face was sanded and reprinted, no short between pins 1,2 and between 2,3) but Ali gave me a full refund.

On Tue, Oct 19, 2021 at 6:38 AM Pete Binsted @.***> wrote:

After having two orders not show up / cancelled I ordered from Zapta's link above and just got confirmation it has shipped. Thank you for the link.

Pete

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/zapta/simple_stepper_motor_analyzer/issues/6#issuecomment-946733846, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAQVMQMPYO6A65SOREQGBPDUHVYGTANCNFSM5GESJXUQ . Triage notifications on the go with GitHub Mobile for iOS https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675 or Android https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub.

[globalcitizen]

The price is going up because the part ACS70331EOLCTR-2P5B3 is discontinued (according to LCSC). The design needs to be updated to use a current sensing approach that does not rely on discontinued parts.

Here is the list of available parts from the same manufacturer.

Unfortunately they still show ACS70331 as available. Given the current climate I'd trust LCSC and assume it isn't.

The specifications for the ACS70331 were 1 MHz, 5A, <550ns, 8mA @ 1Mhz, 3-4.5V, 1.1 mΩ.

It seems the other model they have with broadly similar specs is ACS730. This is still available through LCSC but very expensive.

With this approach, however, pin 6 requires 1nF to ground.

ACS70331 SOIC-8 schematic

ACS730 SOIC-8 schematic