Mutchus

Circuit diagram  Description This circuit is similar to the fading eyes circuit above and is used to slowly brighten and fade interior lights of older cars. The circuit is based around the LM324 low power opamp which draws around 3mA of current, so it won't bother the battery if left connected for extended periods. The top two opamps (pins 1,2,3 and 5,6,7) form a triangle wave oscillator running at about 700Hz while the lower opamp (pins 8,9,10) produces a linear, 5 second ramp, that moves up or down depending on the position of the door switch. The two transistors and associated resistors serve to limit the ramp voltage to slightly more and less than the upper and lower limits of the triangle waveform. These two signals (700 hZ. triangle wave and 5 second ramp) are applied to the inputs of the 4th opamp (pins 12,13,14) that serves as a voltage comparator and generates a varying duty cycle square wave that controls the IRFZ44 MOSFET and lamp brightness. The 5 second fade time can b...

This circuit uses a 555 timer that is setup to each runn in associate Astable operative mode. This generates a nonstop output via Pin three within the type of a sq. wave. once the timer's output changes to a high state this triggers the a cycle the 4017 4017 decade counter telling it to output consecutive sequent output high. The outputs of the 4017 ar connected to the LEDs turning them on and off. Schematic Parts List 1x - NE555 Bipolar Timer 1x - 4017 Decoded Decade 6x - 1N4148 Diode 1x - 1K Resistor (1/4W) 1x - 22K Resistor (1/4W) 2x - 4.7K Resistor (1/4W) 6x - 470 Resistor (1/4W) 1x - 2.2µF Electrolytic Capacitor (16V) 2x - BC547 NPN Transistor 2x - LED (Blue) 2x - LED (Red) 1x - 9V Voltage Battery

Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and off gradually. This makes it a lot easier, for instance, to find the ignition keyhole when the lights have gone off after the car door has been closed. Since the circuit must be operated by the door switch, a slight intervention in the wiring of this switch is unavoidable. When the car door is opened, the door switch closes the lights circuit to earth. When the door is closed (and the switch is open), transistor T1, whose base is linked to the switch, cuts off T2, so that the interior light remains off. When the switch closes (when the door is opened), the base of T1 is at earth level and the transistor is off. Car Interior Lights Delay  Circuit diagram: Capacitor C1 is charged fairly rapidly via R3 and D1, whereupon T2 comes on so that the interior light is switched on. When the door is closed again, T1 conducts and stops the charging of C1. Howe...

1. Chips Chips of LED strip lights include domestic ones, Taiwan-made chips, as well as imported chips(including chips from U.S., Japan, Germany, etc.). Different chips are labeled with different prices. The most expensive chips come from U.S., which is followed by Japan's and Germany's. Taiwan-made chips are affordable for many manufacturers. 2. Sealing There're 2 types of sealing, resin sealing and silicone sealing. The resin one is cheaper, but the thermal performance is a bit weak. The silicone one has good thermal performance while the price is more expensive. 3. LED Color Consistency Though currently there are a lot of packaging factory, but most of small packaging plants have no color separation machine. Thus it is difficult to control the quality. Without spectral separation of the LED, the color consistency would be poor. The light effect of LED strips is not so good. of course. the price difference will be relatively large. smd led strip 4. Soldering Effect There...