Looking for a wiring diagram for Active/Passive switch.

[MrLenny1]

Anyone have a diagram for an Active/passive switch?
I tried 2 different ways and not working properly.
1.) Put Switch on the battery negative. Active works,get a popping sound when switched to passive then no output in passive .
2.) Switched the Volume control and pre-amp circuit, works but battery drains with
no input cable. Arggh.
Any help would be appreciated.

 

[skycruiser]

I think this is a typical wiring design:

The socket for the output audio cable should connect/disconnect the battery ground, so it turns off power to the circuit when you disconnect the cable.

If you can fit a 3-pole switch in this design, you might consider having the passive/active switch also switch the battery power to the circuit board. With this design, the active circuits will continue to draw power even in passive mode.

I'm not sure how passive tone controls fit into this design. If they connect to the "output to jack" signal then they will be in circuit in both active and passive mode.

 

[MrLenny1]

I think this is a typical wiring design:

View attachment 3874983

The socket for the output audio cable should connect/disconnect the battery ground, so it turns off power to the circuit when you disconnect the cable.

If you can fit a 3-pole switch in this design, you might consider having the passive/active switch also switch the battery power to the circuit board. With this design, the active circuits will continue to draw power even in passive mode.

I'm not sure how passive tone controls fit into this design. If they connect to the "output to jack" signal then they will be in circuit in both active and passive mode.

Thanks, I'll try that.

 

[Last Rebel]

Once again ... TB members come through

 

[Low Commotion]

That’s the one that I've used too

 

[walterw]

ehh, that's the "old" TB switching, it's not so good. when bypassed it leaves the preamp input floating, causing noise, maybe even oscillation and popping.

here's the one you want, it's what all modern TB pedals use:

"effect send" goes into preamp input, "effect return" comes from preamp output, "input" is from the pickups and volume controls and "output" goes to the jack.

when in bypass it shorts the preamp's input to ground, silencing it internally while it isn't being used.

1.) Put Switch on the battery negative.

you might be misunderstanding how this works: you don't shut off the battery in any case, in passive mode the battery is still draining while the cable is plugged into the instrument.

trying to de-power the battery in passive mode leads to loud ugly power-up noises, that's why it's not done.

 

[MrLenny1]

Thanks to all for your input. Going to try this tonight.
I got the bass used and the active/passive switch had been removed
and I'm trying to get it back to original state.
Talk Bass is THE place.

 

[MrLenny1]

I started with walterw's diagram and it works great but
I'm getting noise when using a wireless & switch in Active.
With just a cable it is very quiet.
I'll double check my grounds to correct the issue with my wireless.
Once again thanks TB members.

 

[MonetBass]

What is your volume pot value? If it's 250K, you'll need to replace it with a 500K pot to keep the volume consistent when you bypass the preamp.

 

[Lenny JG]

I bought a new switch and installed it just like this and am having problems

So now I have the schematic installed like this,

but the switch is not bypassing anything at all. Both switch positions are exactly the same... but at least I know my circuit is good lol.

What about this schematic would cause the switch to pass the active signal along both positions? Right now I effectively have a wired in 'producer switch' hahaha