Titan Boost/Ocrave – John Hollis

John Hollis Titan boost/octave. This is an op amp input pre amp/booster into a transformer. The transformer is 1k/20k and can output 30v from a 9v battery. The switch inserts a diode bridge for an octave effect.

The sound of the boost warm and clear. The octave effect is pretty good and different from other transformer based effects since the input signal is clean rather than a fuzz tone.

Super Hard On clone

I built this Super Hard On Booster a long time ago. I used one of those old DPDT switches without an LED. Later I wanted to add an LED I used R.G. Keen’s Millennium Bypass on a small piece of stripboard and hung it off the LED leads.

Fun fact: Zachary Vex participated in the discussions over at Diystompboxes but was not okay with people talking about his circuits, the SHO was the exception.

Dual Booster now with LEDs!

This has two booster in series in side. First is a NPN Range Master followed by a Sparkle Boost. The idea was Joe Gore’s. The two booster work well together. They each have their own flavor, and together get a good over driven sound.

The Range Master side sports a variable input cap. So this effect is a variable range boost, that goes from full range boost to treble boost. The other knob is gain.

The Sparkle Boost is a JFET boost by Andrew Carrol. This is a circuit that would make a good building block for a lot of projects. The First knob is gain the other is volume.

I built this over a year ago, and had originally omitted  LED indicators. After playing this with the “band” LEDs were a necessity. The Range Master got a Blue on and the Sparkle Boost got an orange. The switches were 3PDT, and so already had the extra pole. The bigger problem here was drilling the box.

I decided to place the knobs on the side of the box. The reasoning being to avoid hitting them with your foot, and provide more real-estate for foot switches. After some use I find this makes the knows hard to read. Might be best to place them on top. Really the settings can all be done by ear. There seems to to also be some peace of mid to be able to look down and read the knobs without testing.

And of course the last mod would be the DC jack. Originally Joe had suggested this, and it wasn’t on my radar, so the build left a few things out. At this stage with everything assembled, the only place for the DC jack is between the knobs. Which is not a bad spot, but poses a potential awkwardness with DC plugs that have a 90 degree connector, like my One Spot. Should still work, and it will give me another excuse to update this blog.