PC Controls Light Dimmer:  08/19/99 EDN-Design Ideas / (added 5/02) Circuit design idea from EDN Magazine to control one light dimming from PC

PC Parallel Port Output Capabilities:  includes instructions how to connect a relay to PC parallel port (added 4/02)

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. (added 11/06)

Phone in Use Light:  (circuit / schematic design added 6/06)

Photo Electric Street Light:  (electronic circuit added 10/05)

PIC 16c63 MIDI Controlled Light Dimmer:  four channel dimmer controlable using MIDI interface, operates at110-Volt AC, design can be modified to use standard baud rates, and the RS-232 Electrical interface (added 4/02)

PIC Micro LED Projects:  (electronic circuit added 7/03)

PIC Vacuum Fluorescent Display Interface:  (electronic circuit added 4/05)

PIC12c508 Night Light Saver:  (circuit added 7/02)

PIC16F84 LED Chaser (ke4nyv):  (electronic circuit added 7/03)

PIC16F873 Light Controller:  (electronic circuit added 7/03)

Picdim Lamp Dimmer for the PIC12c508:  Microchip Application Note Published 12-Nov-97   (app note added 2/06)

Picref-4: Picdim Lamp Dimmer for the PIC12c508:  Microchip Application Note Published 12-Nov-97   (app note added 2/06)

Picxie 2 8x8 Animated LED Signboard:  (schematic / circuit added 10/02)

PLL-based converter controls light source :  07)/02/98 EDN-Design Ideas  / (added 6/06)  Using the circuit in Figure 1, you can digitally control the light intensity of a lamp. The control loop is based on a PLL, in which the VCO comprises a light-to-frequency converter (TSL220) coupled to a light source that derives its drive from a switching regulator (L4970A). The output of the phase/frequency comparator (4046) serves as the control voltage for the switching regulator. The control voltage is proportional to the frequency error between the reference frequency (fREF) and the signal frequency (fIN) coming from the light-to-frequency converter. Changing the reference frequency regulates the voltage supplied to the lamp to force the output of the TSL220 to lock to fREF. The two resistors at the output of the 4046 provide an attenuation of 1000 to guarantee the loop stability....

Porch light slave switch:  This circuit turns on the porch light when a passive IR security light is activated.  Designed by Andrew R. Morris  (added 6/06)

Powering Fluorescent Lamps from Low Voltage DC!:  inverter circuits (added 4/02)

Preheat Starter for Electronic Ballast:  10/04/01 EDN-Design Ideas / (added 1/06) /  Electronic ballasts for fluorescent lamps use various techniques to turn on the bulbs. The design usually involves a compromise between turn-on voltage and lamp life because the two are inversely related. One way to reach a reasonable compromise is to initially allow a momentary inrush current to warm the filaments, followed by a series of interrupted short circuits across the lamp that generate the required high voltage to trigger the fluorescent. With a preheated filament, the necessary strike potential reduces to half.

PWM Motor Speed Controller/DC Light Dimmer:  (circuit / schematic design added 6/06)

PWM Motor/Light Controller Variations:  diagrams are for12V operation and there are high side (common ground) and low side (common +12V) versions (added 4/02)

PWM Motor/Light Controller:  (electronic circuit added 4/05)

Radio Controlled 3way Light Switch :  (electronic schematic / circuit added 2/05)

Rechargeable Flashlight Obsoletes Lantern Battery:  12/11/03 EDN Design Ideas  /  (added 1/05)  This Design Idea describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight. The rechargeable battery comprises four 2V, 2.5-Ahr (ampere-hour) SLA (sealed lead-acid) cells, similar in size to a standard D-sized battery. SLA cells are especially well-suited to powering flashlights because of their low self-discharge rate....

Remote Solar LED Light:  (electronic diagram added 6/03)

Rhino8 El Sequencer:  (electronic circuit added 7/03)

Ringing Phone Light Flasher (009):  (circuit / schematic design added 11/06)

Ringing Phone Light Flasher:  This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit came from.... (added 2/07)

Robot Beacon rotating light using PIC12C508:  (circuit / schematic design added 6/06)

Remote Solar LED Light:  (electronic diagram added 6/03)

Rhino8 El Sequencer:  (electronic circuit added 7/03)

Robot Beacon rotating light using PIC12C508:  (circuit / schematic design added 6/06)