This user joined on 09/17/2016.
A copper disc with three closely positioned 3-phase solenoids that induce a rotational torque in much the same way as the modern induction machine does. It is driven by a 12V, 3-phase inverter made of spare parts: http://youtu.be/ryu6BsR7XP0
A weapon-less pusher type, this 150g 3D printed robot is defined by its interchangeable armour, absurdly fast/powerful 15W motors, wide tyres and gyro stabilisation. A demo of the robot (gyro ON) can be seen at: https://youtu.be/QViHoi85h1A
Using 45 Watts of PV power (~18V MPP), two 30W Peltiers (0-9V), an MPPT buck converter (IV-matching) and a temperature switch (anti-frost), water is slowly collected at the cold-side heat sink where it falls through a funnel and into a bottle.
A very old project. By using a single VU meter IC (LM3915?) and a another IC that sequentially connects the columns of LEDs to ground (i.e. the time scale), the VU meter effectively "sweeps" across the waveform in a quick succession.
To control the discharge of my 50V/0.3F capacitor bank in a modular fashion I took an 800A peak thyristor, a piezo buzzer, a 9V battery and a momentary switch and then stuffed them all into an off the shelf project box with power I/O terminals.
A 60W 12V plug pack power supply is boosted to 24V, which is then fed to a 50W class-D amplifier with bluetooth audio receiving capability. The output is then split at 3.8kHz with a 2nd order high & low pass filter for the 8Ω tweeter & woofer.
Two cascade Peltier units (top: adjusted to ~36W, bottom: ~72W) This draws about 9-10 amps total at 12V. Heat pump transfer is 15W optimally and the minimum cold side temp reaches -30°C. See: https://www.youtube.com/watch?v=s0KKzHtkc5o
32V & 4A input, 600kHz switching frequency and a soft start relay. These amplifiers are very hard to design but are very rewarding when they are done right. I would highly recommend them for anyone that wants to learn about power electronics.
Contains 6 servos, a text-to-speech unit, glowing eyes, audio reactive LEDs throughout, a spinning gun, power supply, audio amplifier, music, transformer, a brain and manual controls!
See it here: www.youtube.com/watch?v=E8185o7we04
A 1-30V, 6A linear power supply housing a T0-3 regulator, circuit and a serious heat sink. Features include: A soft start relay, a temperature-based two speed fan, under/over voltage alarms and disconnects, various displays & indicators + more!
I thought it would be a fun idea to visualise some math functions as 3D prints. The MATLAB script that I created took an equation, converted it to a surface plot, added a solid base underneath and generated an STL file for 3D printing.
My 32-ohm headphones were proving troublesome to use so I designed an impressive sounding class-A amplifier to help. There is no voltage gain as this "amp" only acts as a current buffer, increasing the impedance of the headphones to infinite.
I put together 4 control boards and 4 H-Bridge power stages to make a decentralised multilevel cascaded grid-tied inverter. The input is DC power which is converted and sent back to the grid. Effectively, this system educates and heats the room.
Now you think I would have realised that a serious H-bridge should be operable from 3.3V. Well I stuffed that up and as a result I needed a way to allow my 3.3V microcontrollers (Arduino Due) to interact with my 5V H-bridges and their sensors.
The final version of the H-bridge for the cascaded inverter of my PhD. This final version was much more robust, had a LOT of protection and other features that made controlling it so much simpler. To date, non of these boards have failed in use.
During the earlier stages of my PhD I realised I would need H-bridges for my cascaded inverter at a later point. I went about designing and constructing a very early version of the H-bridge to test. This was the first time I had used Altium.
The Align Trex 550 is a 1400W model helicopter with a body length of 1 metre and a battery life of 10 minutes. Assembling this allowed for a deep understanding of the mechanics of helicopter flight and maintenance. Very educational!
To enter the world of 3D printing I purchased a Prusa i3 1.75mm from the official website and put it together. This was an exercise in mechanical assembly and greatly deepened my understanding of how 3D printers work.
My first "serious" amplifier project! A dual 15W class AB amplifier with a bias current of about 1A per channel (that's a total standing heat dissipation heat of near 60W)! Summary: Dual Transformer-->Rectifiers -->Caps-->+/-15V-->Amp ALSO FAN!
A 200W remote control car with video/audio transmission. Features include a front/rear camera (with pan/tilt), front(10W)/rear(1W) headlights, rear microphone, 900MHz video with OSD, 2.4GHz control, and a fluffy doll for attracting children.
Using a micro-controller and the insides of a remote from a network of wireless mains relays, I automated the devices in my room. There is a motion sensor, a wireless "bedtime" switch and a set of pre-programmed configurations.
A 50V capacitor bank made up of 10mF caps (31 of them). The total maximum energy is 387.5 joules. There is a controllable bleed resistor and voltage/current multimeters powered by a single 9V battery. The ultimate DC-link capacitor!