Small clean gain device

[simon111]

My next project is to make a device that I can put at the output of a couple of old effects that I have which lower the signal level. I.e when I bypass the effect it's louder.
Speaking to a few guitarists on this they reckon an EQ after it with something between +3db to +10db of flat boost will do the job.

I don't want to make an EQ. I just want a simple device with a control knob (gain) that will boost all the frequencies between 0dB and say +10dB.

Can I use a non inverting opamp to do this and have a variable resistor between pin 2 and 6 to control the gain?

Do I need coupling capacitors? If so what values would you recommend (something high presumably to allow all the signal through - 220nF?)

Or are there any schematics already on the net which will do what I require?

Cheers.

[Dragonfly]

the Tillman preamp is easy to build and gives about 3dB of extra gain....  search "Tillman" here on the forum and it should be easy to find.

my "sparkleboost" will do the same, but has LOTS more gain available....check in the Dragonfly Layouts folder...

AC

[petemoore]

  SparkleBoost "hot reviews' 
  Mosfet Boost 'Very Clean/Lotsa Boost, too
  Strato-Blaster "Somewhere inbetween?"

  Long list of transistor projects for boost, I tried some out to 'see what they're like...a populated board isn't the costy part to just try out, box and switches and knobs add up much more quickly. 

[Arn C.]

AMZ Dual Booster is clean and tons of volume at your disposal.  I make a single boost instead of the dual boost and it works out fine for me.
I believe it is a TL072 IC and a few components.

Peace!
Arn C.