Progress update for the modular guitar amplifier. I’ve finished the power supply. It rectifies a center tap transformer and feeds that into +5, +9, +15, -9, and -15 voltage regulators. Each backplane connector is wired with all five supplies. I’ve only wired up the switching connector and three module slots - I need to get more connectors. Next step is wiring up the signal lines. I set up the front panel with a master output level and input jack. There are two power switches - a master switch for the main module supply, and a secondary power supply switch for the planned power amplifier section slaved into the master.

5.1 surround sound routing box. Supports five sources, with individual volume control for each channel, as well as a stereo fallback mode which mirrors the front and rear speakers.

This is my phaser pedal. The design is quite unique. The phase filter stages are based off the MXR Phase 90. This design uses four stages. The input/output and regenerative circuit is based on the Boss PH-1. The oscillator started out life as the design from the Phase 90, but eventually evolved into something different. I tried to use 5457 JFETs for the phase stages, but was unable to get the oscillator into the active resistance range of the FET. The oscillator was changed in response to this problem to work in an acceptable range to match the JFETs. In addition to the changes necessary to get the oscillator in the appropriate range, I added in two additional controls. The depth control adjusts the amplitude of the oscillator to vary the depth of the filter sweep range. The range control adjusts the bias of the oscillator, which adjusts the base frequency the filter is sweeping across. This allows a wide range of tonal options.

This is the first effects pedal I made. It is a clone of the Ibanez Tube Screamer. while I made no real modifications to the circuit, it has proved a reliable and nice sounding pedal.

This is my Wampler ‘65 overdrive clone. Using the 5457 jfet does not provide enough gain at 9 volts to get a really saturated overdrive. J201 jfets provide a higher gain. Running a much higher voltage would give a larger operating range for the transistor.

This is a Hammond T-400 series tonewheel organ. The organ was in fairly good condition, but required some restoration. The spring reverb needed replacing, and the vibrato drum was seized up. One of the keys had a broken spring mount that required disassembly and a little super glue. Many of the components required a tuneup, and the whole thing was filthy with dust. Once everything was restored to working order, I made some modifications to the circuit to get a close sound to a traditional B3 based off of information here. I also added in a send/receive loop between the output of the tone circuit and the power amplifier. Sending the signal into my Orange amp sounds great.

This is a Mu-tron III style envelope filter. The circuit is based around a state variable filter. The circuit has some novel variations of the basic filter. There is a send-receive loop so the envelope can be extracted and the filter applied further down the signal chain. The filter can be toggled between three frequency ranges. The attack and decay responses are independently adjustable. The output is mixable between the wet and dry signals. Finally, the filter can be switched from envelope control to an expression pedal to allow use as a pedal wah

Named the “Space Boob” by Miranda, this is a Big Muff fuzz pedal clone. The enclosure is a steel bowl.