Prevent battery usage while OFF?

Collection of answers to the basic questions of stompbox building.

Prevent battery usage while OFF?

Postby DieterVDW » 06 May 2014, 23:17

Hi,

*** n00b question warning ***

I wonder why it is needed for most effects to drain the battery while the effect is OFF? Especially for true-bypass effects.
It would seem very easy to me to make the switch break the circuit so the battery is not drained while the effect is OFF.
I'm guessing the reason why this is not done is because there would be audible pops when powering the circuit, or a delay before the circuit is fully powered and working? All of this does not really seem unsurmountable though for the naive noob ...

Anyone care to explain why this is?
DieterVDW
 
Posts: 13
Joined: 06 Jan 2013, 20:50
Has thanked: 4 times
Have thanks: 0 time

Re: Prevent battery usage while OFF?

Postby Motter » 06 May 2014, 23:54

Most pedals have some path to ground even when they are switched off, whether it is through a bias splitter or a transistor or something else. It would take quite a bit of switching in some pedals to lift every connection, and even then it would most certainly pop unless you bridged every broken connection with a high value leak resistor. Seems like a lot of work to reduce a little current drain on the battery.
Motter
Breadboard Brother
 
Posts: 111
Joined: 24 Aug 2012, 19:02
Location: New Orleans
Has thanked: 19 times
Have thanks: 76 times

Re: Prevent battery usage while OFF?

Postby coldcraft » 07 May 2014, 00:25

many pedals pop or squeal for a short time when power is lost or enabled.
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.
User avatar
coldcraft
Diode Debunker
 
Posts: 733
Joined: 11 Jul 2009, 02:00
Has thanked: 42 times
Have thanks: 82 times

Re: Prevent battery usage while OFF?

Postby Blitz Krieg » 07 May 2014, 09:39

Image

if you notice at the bottom of this schem, it says to wait thirty seconds for the capacitors to charge. especially if the effect hasn't been powered in a long time.
User avatar
Blitz Krieg
Breadboard Brother
 
Posts: 82
Joined: 18 Feb 2014, 11:57
Has thanked: 577 times
Have thanks: 4 times

Re: Prevent battery usage while OFF?

Postby Nocentelli » 07 May 2014, 12:28

+1

The LFO in the Danelectro vibe is disconnected from power in bypass, and the pedal is pretty useless as a result with a good 2/3 second delay after pressing the footswitch before you get the vibe effect kicking in.
mmolteratx wrote:absolutely zero commercial use allowed. If I find anyone selling these, I'll fly to your house and kick you in the nads. And you may or may not find yourself in trouble.
User avatar
Nocentelli
Tube Twister
 
Posts: 2027
Joined: 09 Apr 2009, 08:06
Location: Leeds, UK
Has thanked: 770 times
Have thanks: 771 times


Return to Stompbox Builder's FAQs & How To's

Who is online

Users browsing this forum: No registered users and 1 guest