Advice on tremelo / phaser design

[rats_eyes]

I'm planning to build a pedal which contains a tremelo and a phaser circuit, at the request of a friend who wants to be able to switch both fx on / off at the same time. I'm considering a box with two foot switches next to one another, so that they can be used independently as well. This I think I can manage.

However... I also want to add a simple clean boost to tackle the perceived volume loss that both phaser and term circuits can bring to the table. If I use a separate switch for each circuit, is there a way I can direct either or both circuits through a single boost circuit at the output using true bypass switching? I'd like to avoid putting a separate boost on each circuit.

I can't think of a way to do this, have any of you found a way to achieve this? I'm not sure that it's possible, but there's a lot I don't know!

My plan b is to use one foot switch and a 3 way toggle (to choose tremelo / tremphase / phase) but thought two switches would be more user friendly.

Any advice at all would be greatly appreciated!

[Digital Larry]

Suppose you had a single NPN common emitter stage for the boost.  You've seen how a resistor through a cap to ground from the emitter can be used to increase the gain.  So you run one of these through an unused pole of each switch.  So, each one boosts a bit by itself and more when both are engaged.  Never tried it, but it might work.  You'd want to put a high value bleeder resistor (10 M maybe) across each cap to avoid a huge pop when it gets switched in.

[Mark Hammer]

The EA tremolo is a decent-sounding design, and provides enough volume boost that it needs a volume pot.  Indeed, if one sets the modulation depth at min, it can even be used as a booster.  Maybe that's your answer.

[rats_eyes]

Thanks for your input! I think I'm gonna go for a higher output circuit like the EA after all, sounds like that would do the trick. Cheers folks

[GibsonGM]

...or if you don't go that route, couldn't you just add an NPN or FET boost to whatever design you use, one at the output of each effect?   Takes very few parts to do this...

[rats_eyes]

What circuit would you recommend for a clean boost for this project ? I've heard good things about the amz fet boost,  but haven't tried it yet

[MrStab]

not really what you asked, but it's worth considering that you may be able to add a switch to run both the phaser and the tremolo off the same LFO. that or an external LFO input could really enhance the functionality of the pedal. may be complicating things, though.