Author Topic: DC JACK  (Read 839 times)

DC JACK
« on: April 25, 2018, 07:35:24 AM »
Hi I'm building a PCB board at the moment with a 3PDT attached.  I was wondering if I actually need a d.c jack attached to the power?

Digital Larry

Re: DC JACK
« Reply #1 on: April 25, 2018, 08:43:29 AM »
This post should be in the "Build Your Own Stompbox" area, but to answer your question, if your circuit draws low enough current to have decent battery life from a 9 volt battery, then no you don't necessarily need a DC power jack.  Many people run the ground through the input jack in such a case so that the battery doesn't drain if no cable is plugged into the input.  The power is switched in that way rather than the 3PDT to avoid a gigantic turn on/off pop.  I don't have a schematic to refer you to at the moment.
Digital Larry
DSP tinkerer and former transistor twister

Re: DC JACK
« Reply #2 on: May 05, 2018, 03:06:02 PM »
Hey thanks that was helpful information  :)