Relay-switch | Electronic Project Circuits

Posts Tagged ‘relay-switch’

Moisture Activated Relay by Bipolar Transistor

Today we try to build warn the moistness or Moisture Activated better. Or do go to use be warn it rains. Because of be the circuit is simple. Follow the circuit will think use Bipolar Transistor just one only. When measure touch the moistness make the electric current flows through to pin B of Q1 get then make it works. The Relay as a result work apply the work controls electric other appliances. By the rapidity of this circuit can control with R2 – 1M. If you use power supply the size is 6V-9V. Should use Relay 6V-9V resistance coil sizes about 500ohm. For the transistor use 2N2222 or BC549 or C1815 etc. Then make the circuit s work well sir.

Be the first to comment - What do you think? Posted by admin - August 30, 2008 at 12:49 pm

Categories: Detector, Electronic Control Tags: Bipolar Transistor, moisture sensor, relay driver circuit, relay-switch

Basic Timer Control with NE555

As friends many take an interest the circuit about IC 555 which be integrated highly popular that circuit. I then lead the circuit sets the time be Basic Timer Control with NE555 come to present again. By it basically the base of the circuit sets the time work instruction easily initial. Press S1 for a already moment liberate for initial setting the time (Timing Cycle) Relay encouraged work (Pulled in). Until anniversary completed work. The R1 and C1 control length of while delaied keep. If use the value C1 very the time long ago go up This circuit meets to wasp Logic pulse with sir. Request have fun the circuit sets the time this easily please sir.

Be the first to comment - What do you think? Posted by admin - August 13, 2008 at 8:23 am

Categories: Timer Tags: NE555, relay-switch, Timer Switches

Relay Driver

The above is a standard way of driving Small Power Relays from Control Signals generated by Logic or Opamp Circuits.

C2 and R5 form a snubber which improves the life of the metal contacts, the contacts can erode due to sparking when switching inductive or even big loads. reduces EMI_RFI.

The Electromagnetic Solenoid Coil is rated by Volts and Ohms. If you choose 12V ensure a stable 12V is provided, more voltage will heat coil, less voltage will cause sparking or will drop out the magnetic holding. A high coil resistance is better as the heat will be less and power consumption of your design is low.

Read More Source :http://schematics.blogspot.com/2005/12/relay-driver.html
Thank you.