This is a headphone amplifier for guitar players. It has a build-in transformer, but it can also run of a 9V battery. Power is automatically switched on if the guitar lead is plugged in. The unit has a 3 band EQ as well as a volume control. Below is a photo of the amplifier.
Compact powered mixer
The purpose of this mixer is to extend my existing setup. For this reason it has only four mono channels. Each channel has a gain control as well as a simple LED PLI to set up an ideal signal level for the channel. Thereafter follows a low-cut as well as a high-cut filter. The filters is followed by a 3-band EQ with a sweepable mid. Each channel also has a auxiliary send. Lastly each channel has a Pan as well as a Fader (Level) control. Each channel has a direct out. Below are a photo of the mixer.
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Integrated Hi-fi amplifier:
This amplifier had 4 selectable line inputs and a microphone input. A single mixer knob was used to fade between the microphone and line inputs. The amplifier contained Low-cut and High-cut filters. The equalizer section consisted of Low and High shelving equalisers as well as a sweepable Mid equalizer. The amplifier had a auxiliary output which could be used to drive sound to light units. The power amplifier was a 20W rms MOSFET design.
This is a photo of the amplifier before I fitted the knobs
This is a photo after the knobs have been fitted
Stereo disco mixer:
After testing out the above amplifier for DJ applications I realized that it would be much better to have a separate stereo mixer instead of only an input selector to select between sources. I then proceeded to design a small mixer.
The mixer had six stereo input channels with faders to control the mix volume for each channel. I also included a headphone amplifier with a selector knob which enabled the user to listen to any of the mixing sources through the headphones.
Compact sound to light units for disco applications:
These units were stand-alone units which each contained three 60W coloured globes. The audio input from a line source was filtered into LO, MID and HI frequencies, which was each send to a comparator which triggered a TRIAC if that component's amplitude was above a certain adjustable threshold. I disassembled these units and reused some of the parts for my advanced lighting controller.
Advanced disco lighting controller:
I decided to built the larger lighting system which I can not only use for parties, but also at live gigs. The system consists of a main controller unit which was interfaced to the lights. Below is a photo of the setup:
The controller unit is in the center of the photo. The four big lights at the bottom are connected to the dimmer section of the controller unit. The 6 yellow knobs are used to control the dimmers. The lights at the sides are connected to the 5 band sound-to-light section of the controller. These lights can only be switched on or off, but not dimmed. The five red knobs controls the threshold values of the different frequencies for the left channel, while the green knobs is used for the right channel. The black knobs are used to control the strobe lights, which is on top of the controller unit in this photo. The strobes can either be flashed at a constant rate, or can be triggered on sound.
Computer controlled laser show system.
I started this project as my final year thesis at the University of Stellenbosch. Since that time I have rebuild the system totally.
This laser controller uses three galvanometers. The first galvanometer controlled the shutter, while the other two galvanometers controls the X-axis and Y-axis mirrors respectively. Below is a front view of the laser controller unit.
Below is a photo of the laser setup I am currently using. The box at the bottom contains the PC. The keyboard is mounted on the back of the front cover, which folds down. The mousepad slides out on the top-left side of the box. If the box is closed, the mouse is stored in the space above the stiffy drive. The controller for the lights is placed on the laser computer, with the computer monitor on top of that. The laser controller with the laser source is placed on the top of the stand.
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