J112 substitute?

[lego4040]

I want to add the not so square pulsing led to NomNom, in case i don't have a j112 can I use say a j201 or similar. So while following this schematic onto perf I am lost as to where the hell LS is supposed to wire up to. On the schem it goes to middle leg gate but on printout pcb it doesn't

[lego4040]

Shouldn't LS be tied into the - side of the cap/gate(3)? Is it missing a trace to it? Not a biggy, easy fix. I was hoping to have this all boxed and done before road trip tomorrow at Myrtle Beach,

[jkp1300]

Sorry, for my 1st post being a reply to a 2+ rear old post but it's asking exactly what I'm trying to figure out and I can use lego4040's pics. However, nobody replied to him. Maybe if I resuscitate this post I can get the answer.

Speed control transfer image on page 11 of the NomNom build doc doesn't seem to match the schematic above it - LS pad has no trace. Shouldn't it be connected to Q1 gate which then connects to the LS pad on the PCB?

Thanks in advance - Kenny

[imjonwain]

...Shouldn't it be connected to Q1 gate which then connects to the LS pad on the PCB?

Yup, based on that schematic.

Here's the j111/112/113 datasheet if you wanna see the specs to find another part to use.

https://www.mouser.com/datasheet/2/149/J113-889353.pdf

[jkp1300]

Thanks for your reply!