Negative Resistance Oscillator with Homemade Tunnel Diode:  This project may not be very practical but I find it to be a very exciting experience. When I first heard about tunnel diodes many years ago, they seemed to me, to be one of the most exotic devices on earth. It was very exciting to discover that I could easily make at home, at least in very crude form, an actual working device that is similar. (added 2/05)

NiCd Battery Fast Charger:  This is an advanced battery charger design based on Maxim's battery charger IC MAX712. This device can, using a minimal set of external components, fast-charge an NiCd/NiMH rechargeable battery. Fast charge is terminated using several detection methods, including dV/dt, dT/dt and a time-based cutout. Full details can be obtained from the MAX712 datasheet, available at the Maxim Inc. Website (electronic construction project added 2/06)

Oxygen Sensors. :  When they go bad your automobile runs poorly, learn about them and build a substitute for diagnostics or off-road use.    (electronic construction project added 2/06)

Phase Controlled Lighting System:  This project was developed to provide some pleasant room lighting as the author was fed up with inflexible standard incandescent light bulbs used in most rooms. Specifically it details the use of five Low Voltage Lamp units as up-lighters placed around a room. Each lamp can be turned on/off individually and all lamps can be dimmed from full brightness down to zero brightness. Figure 1 shows one of the lamps mounted to a wall. (electronic construction project added 2/06)

PIC NiCad Battery Charger:  This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life. This 'intelligent' charger was designed for high current and rapid charge applications such as cordless power tools and model racing cars. These battery packs are expensive and sometimes difficult to purchase. This charger uses the cell manufacturer's recommended charge method, to safely and quickly charge batteries. (electronic construction project added 10/05)

PIC Programmer :  to download programs into PIC microprocessors.    (electronic construction project added 2/06)

PreAmplifier :  suitable for guitar or microphone use.    (electronic construction project added 2/06)

Propeller clock :  a few light emitting diodes spin, precisely controlled by a PIC microprocessor, giving the illusion of a larger array.    (electronic construction project added 2/06)

Rail Gun, buiding project (Research lab):  (electronic construction project added 2/06)

Remote Control:  This is a simple wireless remote control unit, which was originally designed for a model hovercraft which I was developing with the help of my friend Uday Arya. The project has been discontinued for technical reasons, but this remote control unit survives. The method used seems to be quite popular among many remote control units. (electronic construction project added 2/06)