Light Relay Switch | Electronic Project Circuits

Posts Tagged ‘Light relay switch’

Light Actuated Relay Circuits by Photo Transistor

The Light Actuated Relay Circuit be office circuit with the light. The prominent point of this circuit be meet the light has fast more using LDR control circuit the very. When the light leaves work suddenly. When meet the light makes Photo Transistor work bias current change it has made the transistor works to cause Relay work with. For VR1 perform fine decorate the rapidity of the circuit. This circuit is the circuit is simple. The equipment that use to replace can. such as Q1 = 2N2222 use other number can replace almost be finished request a kind NPN alike enough such as BC549 or BC337 or C1815 or C945 etc. For oval should use 6V-9V sizes that are valuable the resistance within relay coil about 500ohm. Other detail has a little , then build easily sir.

Be the first to comment - What do you think? Posted by admin - August 23, 2008 at 10:05 am

Categories: Detector, Electronic Control, Lighting Tags: automatic light control, Light relay switch, Photo Transistor

DC motor runs off of calculator solar cell in dim light

How do we achive 10nA operation? By using diodes in place of pull up resistors, and by isolating the DC load from the trigger circuit via junction drops and the 10nF capacitor. If there is too much power comming from the solar cell then the motor might run too often or even continuously. You can avoid this by putting a 100K ohm resistor in series with the solar cell.

Be the first to comment - What do you think? Posted by admin - July 2, 2008 at 1:38 pm

Categories: Electronic Control, Lighting Tags: Light relay switch, motor control, Solar power systems

Automatic Headlight Brightness Switch

Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. It does this by sensing the lights of that traffic. In this way, you can drive safely with your high-beams on without blinding other drivers.

Parts:
R1 5K 1/4W Resistor
R2, R3, R4 5K Pot
Q1 NPN Phototransistor
Q2 2N3906 PNP Transistor
K1 Low Current 12V SPST Relay
K2 High Current 12V SPDT Relay
S1 SPST Switch
B1 Car Battery
MISC Case, wire, board, knobs for pots

Notes:
1. Q1 should me mounted in such a way so it points toward the front of the car with a clear line of site. Suitable places are on the dashboard, in the front grill, etc.
2. Adjust all the pots for proper response by testing on a deserted road.
3. S1 enables and disables the circuit.
4. B1 is, obviously, in the car already.
5. Before you try to connect this circuit, get a wiring diagram for your car. Some auto manufacturers do weird things with wiring.
6. Connection A goes to the high beam circuit, B goes to the headlight switch common and C connects to the low beam circuit.