Panel switch wiring

Monday, September 8, 2014

Making PC USB LCD controller project

This really a work that so cool if you like modif PC. So this is a USB interface for alphanumeric LCD display like 4 × 20 which can be controlled with LCD Smartie program. USB interface is implemented by using PIC18F2550 microcontroller, Using USB LCD modules. Below is a project of the USB LCD controller.

Schematic circuit and PCB design

source | link

Sunday, September 7, 2014

PWM Speed Motor Controller

This is very useful schema.When we use high speed moters(Pwm)We need a schema to boost the speed so this is the schema for it.This schema can generate 170-200Hz frequency.This schema operates with 4.5V to 6V.

Note

# Use IN4148 diodes for this

Wednesday, September 3, 2014

Fan Controller Using Just Two Component

The Maxim MAX 6665 (www.maxim-ic.com) provides a complete temperature-dependent fan controller. It can switch fans operating at voltages of up to 24 V and currents of up to 250 mA. The IC is available from the manufacturer in versions with preset threshold temperatures between +40 °C (MAX6665 ASA40) and +70 °C (MAX6665 ASA 70). The device’s hysteresis can be set by the user via the HYST input, which can be connected to +3.3 V, connected to ground, or left open. The following table shows the hysteresis values available:

HYST = Hysteresis
open = 1 °C
ground = 4 °C
+3.3V = 8 °C

Fan Controller Using Just Two Component Circuit diagram:

Fan Controller Circuit Diagram

The other pins of the SO8 package are the FORCEON input and the status outputs WARN, OT and FANON. The test input FORCEON allows the fan to be run even below the threshold temperature. The open-drain output WARN goes low when the temperature rises more than 15 °C above the threshold temperature, while the open-drain output OT indicates when the temperature is more than 30 °C above the threshold. The push-pull output FANON can be used to indicate to a connected microcontroller that the fan is turned on.

Source by : Streampowers

Friday, August 29, 2014

DC Motor Speed Controller

DC Motor Speed Controller Circuit Diagram. This schema takes advantage of the voltage drop across bridge rectifier diodes to produce a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as efficient as a switch-mode schema but it has the virtues of simplicity and no switching hash. The four full-wave bridges are connected so that each has two pairs of series diodes in parallel, giving a voltage drop of about 1.4V, depending on the load current.

DC Motor Speed Controller Circuit Diagram

The rotary switch should have "make before break" contacts which should be rated to take currents up to about an amp or so. For higher currents, higher rated bridge rectifiers and a suitably rugged rotary switch (or solenoids) will be required. If you want smaller voltage steps, you could use the commoned AC inputs on the bridge rectifiers to give intermediate steps on the speed switch.

Author: Stephen Butcher,

Monday, August 11, 2014

Build a 1000W AC Motor Speed Controller Wiring diagram Schematic

Build a 1000W AC Motor Speed Controller Circuit Diagram, this is a simple1000W AC Motor Speed Controller Circuit Diagram. This triac based AC motor speed controller schema is designed for controlling the speed of AC motors like drill machines, fans, vacuums, etc. The speed of the motor can be controlled by changing the setting of P1 potentiometer. The setting of P1 determines the phase of the trigger pulse that fires the triac. The schema incorporates a self-stabilizing technique that maintains the speed of the motor even when it is loaded.

1000W AC Motor Speed Controller Circuit Diagram