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Light control circuit diagram – Circuit Schematic
Light control circuit diagram
Use of ordinary telephone ringing circuit KA2401 and peripheral components, the installation of the light control when the bell...
Power LED Driver – Circuit Schematic
Power LED Driver
A constant-current power LED driver circuit is shown in Fig. 1. Q1 is turned on by R1 and acts as a variable resistor. Q2 is an “over-current” switch and R2...
Quick-Charge Auto-Fire Flash Circuit – Circuit Schematic
Quick-Charge Auto-Fire Flash Circuit
The circuit uses an IRF740 MOSFET which is rated at a maximum DS V value of 400V. The avalanche voltage is calculated as 3520 1. max   DSA VV V. This m...
Single-Shot Auto-Charge Flash Circuit – Circuit Schematic
Single-Shot Auto-Charge Flash Circuit
There is a voltage divider composed of R2 (10M) and R3 (100K) which effectively divides the voltage across C2 by about 100. Also note the ground of C2. It is co...
Carbon Arc Beam Generator – Circuit Schematic
Carbon Arc Beam Generator
Carbon arc beam was used extensively as searchlight during WWII. Fig. 1 shows a basic configuration. Basic beam generator can be modified as shown in Fig. 2 so ...
12ft GPS Wall Clock – Circuit Schematic
12ft GPS Wall Clock
We discussed creating a 6` tall alarm clock - authentic down to the Timex face plate. While this may sound like a silly idea to begin with, it quickly became ob...
PWM Controller Simplifies High Power LED Designs – Circuit Schematic
PWM Controller Simplifies High Power LED Designs
High brightness (HB) and super HB LEDs are found in LCD TFT backlighting in highend TVs, industrial lighting, and projectors. One popular area is for instrument...
Pulsed Argon and/or Krypton (Ar/Kr) Ion Laser – Circuit Schematic
Pulsed Argon and/or Krypton (Ar/Kr) Ion Laser
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LED Dance Pad – Circuit Schematic
LED Dance Pad
Using LEDs as light sensors. A DDR pad. We designed our pad to have no moving parts. Instead, we chose to measure light reflectance off the user`s feet to deter...
Dimmer circuit Triac TIC 226 – Circuit Schematic
Dimmer circuit Triac TIC 226
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LED Flasher – Circuit Schematic
LED Flasher
The idea behind this economical‚ ashing LED indicator is very simple. It uses a very low frequency oscillator to drive two LEDs. As can be seen in the circuit...
Interactive Toy Traffic Lights – Circuit Schematic
Interactive Toy Traffic Lights
This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At swit...
Halogen Lamp Dimmer With Soft Start – Circuit Schematic
Halogen Lamp Dimmer With Soft Start
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplate cont...
Constant Current LED Drive – Circuit Schematic
Constant Current LED Drive
However, for applications needing many LEDs, this becomes extravagantly inefficient and it is tempting to keep the voltage drop across the resistor as small as ...
Backup Lamp Circuit – Circuit Schematic
Backup Lamp Circuit
This little circuit will pay for itself many times over the first time it is used, especially if you are in the shower. This back-up lamp stays off as long as l...
Slave Flash Trigger – Circuit Schematic
Slave Flash Trigger
The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually no...
Automatic White-LED Garden Light – Circuit Schematic
Automatic White-LED Garden Light
This white-LED driver circuit is ideal for use in a garden light. It automatically turns the LED on at night and runs from a single 1. 2V nicad cell which is re...
LED Lighting For Dual-Filament Lamps – Circuit Schematic
LED Lighting For Dual-Filament Lamps
Before we describe how it`s done, note that we recommend that the result be checked as having sufficient brightness for a stop & tail-light application. That`s ...
Bluish Flasher – Circuit Schematic
Bluish Flasher
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Contrast Control for LCDs – Circuit Schematic
Contrast Control for LCDs
The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant....