Author Topic: Volume pot in Boost Schematic?  (Read 1818 times)

Chinchen

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Volume pot in Boost Schematic?
« on: January 06, 2013, 05:13:50 PM »
Hi all. I am new to this so please be gentle....

(EDITED)

I built a little lpb-1 boost circuit and I need to wire the volume pot to it. Problem I am having is that none of the schematics I find show the POT/SWITCH relationship. Please help me understand the relationship of a volume pot to the circuit AND SWITCH. If I wire it up like this:

 Where do I put the pot?

I also have a fishman preamp from an acoustic guitar that I want in the same box. The pre has a level and tone control knobs. The setup is for my acoustic mandolin equipped with a soundboard transducer. I think I want the pre before the boost? Not sure where to start with getting the pre to be "on" always and the boost on the switch with level controlled by the pot...sorry if this is a dumb question.

Here is the tech sheet for the preamp:
http://www.marcandella.ch/WG3/FISHMAN/separate_onboard_preamps/AGP-2_OwnersManual.pdf

This is the boost schematic:


Thanks!!
Jason
« Last Edit: January 06, 2013, 06:53:12 PM by Chinchen »

pryde

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Re: Volume pot in Boost Schematic?
« Reply #1 on: January 06, 2013, 06:22:13 PM »
The volume control is at the end of the schematic (100k).

Wiring this potentiometer would be:

Lug 1 goes to ground
Lug 2 is the output of the circuit
The 0.15uf capacitor is connected to Lug 3

Check the pic for reference



Chinchen

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Re: Volume pot in Boost Schematic?
« Reply #2 on: January 06, 2013, 06:40:21 PM »
Thanks...duh. Is that the top of the pot in your pic? or the back?.....top, ok but then

"lug 2 is the output of the circuit"....which one goes to the output jack? The middle one, right?


The pot goes between the circuit and the output jack? That pic isnt showing wires, just the relationship of the lugs to the schematic, right?

How does the switch relate to this? I need images. :-\



« Last Edit: January 06, 2013, 06:51:29 PM by Chinchen »

midwayfair

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Re: Volume pot in Boost Schematic?
« Reply #3 on: January 06, 2013, 07:33:57 PM »
Thanks...duh. Is that the top of the pot in your pic? or the back?

Read this, it'll help:
http://www.beavisaudio.com/techpages/SchematicToReality/
Myself's music & things I make: http://jonpattonmusic.com. My band: http://midwayfair.org. PCBs of my designs from: http://www.1776Effects.com (Bearhug Comp & Cardinal Harmonic Trem); http://www.jmkpcbs.com (Hamlet+ delay & Blue Warbler envelope vibe); Snow Day OD/Flabulanche: www.madbeanpedals.com

pryde

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Re: Volume pot in Boost Schematic?
« Reply #4 on: January 06, 2013, 07:42:17 PM »
Your output wiring would go like this:

middle lug of 100k pot>3pdt switch>output jack

Yes the pot would sit between the circuit and the 3pdt switch

So, this wiring would go like this:

pcb output (0.15uf cap)>lug 3 of pot. Also don't forget to run a wire to ground from lug 1 of the pot.

Did you build a vero of this circuit? If so it may help to post the actual circuit you have built.

Chinchen

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Re: Volume pot in Boost Schematic?
« Reply #5 on: January 06, 2013, 08:05:55 PM »
Thanks fellas....will work on that after dinner...
Jason

Chinchen

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Re: Volume pot in Boost Schematic?
« Reply #6 on: January 06, 2013, 08:34:24 PM »
You don't want to see the circuit..... :-X