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RGB LED Love Heart – Circuit Schematic
RGB LED Love Heart
This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th weddi...
LED Colour Organ circuit – Circuit Schematic
LED Colour Organ circuit
Nearly all the existing designs I found used direct switching of the lights (with no software control in between) and contained manual potentiometers for light ...
Christmas LED Light String Display – Circuit Schematic
Christmas LED Light String Display
This project shows how to build a simple LED light string display using seven 24V LED light strings. I built this project for Christmas 2009 in order to decorat...
A little glowing Halloween ghost – Circuit Schematic
A little glowing Halloween ghost
This glowing Halloween ghost is available as a kit from the tuxgraphics online shop. It can glow friendly or it can produces scary flashes. You can choose your ...
Taylor Source Follower – Circuit Schematic
Taylor Source Follower
I took 22 used, octal, 6. 3-volt, 600mA, controlled-warm-up tubes (mostly 6SN7s) and 22 octal tube sockets and an old extension cord and wired all the sockets i...
CD47 (Rodan) Nixie Tube Clock – Circuit Schematic
CD47 (Rodan) Nixie Tube Clock
Build a CD47 Nixie Clock. Power: approx. 100 Watts (some might say "Isn`t it over- engineered", but you`ll see at the end of that project, that it`s ok. Nixies ...
Nocrotec X2000 Numitron Clock – Circuit Schematic
Nocrotec X2000 Numitron Clock
Numitrons are neat display devices similar to Nixie tubes, but they were designed for low voltage use. Numitrons are basically incandescent displays, using fila...
Nocrotec FIP-Clock (FIP60B30T VFD Display) – Circuit Schematic
Nocrotec FIP-Clock (FIP60B30T VFD Display)
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VFD Clock – Circuit Schematic
VFD Clock
A vacuum fluorescent display (VFD) tube is a type of tube which consists of a hot cathode (filaments), anodes (phosphor) under a high vacuum condition in a glas...
Crosswalk Pedestrian Signal and Homemade Controller – Circuit Schematic
Crosswalk Pedestrian Signal and Homemade Controller
The signal has three wires: common, "walk", and "don`t walk". This page describes the operation of the unit`s countdown feature. The information and examples pr...
Shay Tips – Circuit Schematic
Shay Tips
The Shay is equipped with flickering ashpan and firebox lights. These are simulated with LEDs. The red and yellow ones both flicker, the red ones stay on about ...
LEDs Turning them On and Off – Circuit Schematic
LEDs Turning them On and Off
The last installment in this series ( LEDs 102 - Use On Board Trains ) ended with a few thoughts about turning battery powered LEDs on and off. In this article ...
LEDs Revisited – Circuit Schematic
LEDs Revisited
LEDs are available in a number of different sizes and shapes with most being round topped cylinders that are either 3 mm or 5 mm in diameter. These sizes are al...
SCR LIGHT DIMMER – Circuit Schematic
SCR LIGHT DIMMER
Provides full range of brightness control for up to 500w of lamps. Ujt Q1 provides turn. on pulses for scr-L. Stern, "Thyristors Provide New Opportunities for E...
XENON STROBE – Circuit Schematic
XENON STROBE
Two transistor oscillator generates pulses at about 500 Hz for step-up by 300-mA filament transformer T1 (Radio Shack 273-1384) to charge storage capacitors C2 ...
TRIAC LAMP DIMMER – Circuit Schematic
TRIAC LAMP DIMMER
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SCR SLAVE FLASH – Circuit Schematic
SCR SLAVE FLASH
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800 W SOFT START LIGHT DIMMER – Circuit Schematic
800 W SOFT START LIGHT DIMMER
The zener provides a constant voltage of 20 V to unijunction transistor Q1, except at the end of each half-cycle of the input when the line voltage drops to zer...
1 A LAMP FLASHER – Circuit Schematic
1 A LAMP FLASHER
National LM195 power transistor is turned on and off once per second for flashing 12-V lamp. Current limiting in LM195 prevents high peak currents during turnon...
TRIAC LAMP DIMMER – Circuit Schematic
TRIAC LAMP DIMMER
Using a heatsink, the TRIAC (TR1) can handle up to 350 watts. The neon lamp, I1, won`t trip the gate until after it conducts and using R1, set the lighting wher...