Collection Schematic

Showing posts with label build. Show all posts

Thursday, October 16, 2014

Build a Constant LED Power Supply Circuit Diagram

An LED is usually a series resistor needed to ensure that the LED does not get too much power. The disadvantage of such a resistor is that the current thus also changes by the LED and the brightness as the voltage changes.

This circuit prevents that, by independent of the voltage, a constant current through the LED.The circuit uses two transistors and two resistors. The circuit can be connected to voltages of from 5 to 24 V.

Constant LED Power Supply Circuit Diagram

Thursday, September 4, 2014

Build a Solar power supply

Here is Solar power supply schema delivers either 4.8 or 7.2 V regulated at 15 mA with a 3-V input from a bank of photocells. Rl should be 453 kQ for a 7.2-V output and 274 РЁ for a 4.8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting suitable solar cells.

Build a Solar power supply Circuit Diagram

Build a Load Disconnect Switch Wiring diagram Schematic

This is a simple electronic Load Disconnect Switch Circuit Diagram. This schema deep discharge can damage a rechargeable battery. By disconnecting the battery from its load, this schema halts battery discharge at a predetermined level of declining terminal voltage. Transistor Ql acts as the switch. The overall schema draws about 500A when the switch is closed and about 8 when the switch is open.

Load Disconnect Switch Circuit Diagram

Wednesday, August 20, 2014

Build a LED Mini Audio Analyzer circuit Wiring diagram

This analyst is, a sensitive instrument, in the frequency changes and width of a acoustic signal. Thus the brightness of LED that turns on each moment of is proportional signal width, while the colour of proportionally frequency.

Mini Audio Analyzer Circuit Diagram

The schema input sensitivity is regulated with R2, in order that in powerful signals they turn on the red LED, in the middle the yellow LED and in the low green LED. The display unit, is constituted by 3 lines of 10 LED the every, what is checked by a counter decoder (IC2). Two gates ICa-b, function as the IC2, with the R6 regulate the frequency.

When does not exist signal in the input, then no one LED does not turn on. As soon as it will be applied signal, then the LED will begin to blink depending on the rythm and the intensity of signal. Can experiment with the prices of resistances R4, R5, so that you find the value that suits in like your. Initially it can they are placed trimmer 1KO, in the place of R4, R5 and after is found the suitable value, they are replaced with permanent resistances.

What it wants it can it adds also other LED, adding other a completed same press with the IC2. The particular schema does not have the claim, the precision of measurement input signal.

Part List

R1= 1K8Kohm
R2= 100Kohm trimmer
R3= 1Kohm
R4= 100 ohm.....1Kohm
R5= 100 ohm.....1Kohm
R6= 100Kohm trimmer
C1= 100nF 100V
D1....10= RED LED
D11....20= YELLOW LED
D21....30= GREEN LED
IC1= LM3915
IC2= 4017
IC3= 4011

Saturday, August 16, 2014

How to Build Timer with Musical Alarm

The timer with Musical Alarm use famous CMOS oscillator/divider IC (IC1 ). Although this schema operates in 9V its standby current drain is very low. The time delay of timer schema can be adjusted by adjusting the preset VR1. The base of npn transistor T1 is connected to pin 3 of IC1 through resistor R4 and its emitter terminal is connected with pin 2 of melody generator IC (IC2) in order to provide positive supply when adjusted time delay is over.

Timer with Musical Alarm Circuit Diagram

Here the zener diode ZD1 is used as regulator which reduce power supply to required for operation of IC2 i.e. 3.3V. Lastly for music output the output from pin 1 of IC2 is fed to loud speaker via driver transistor and its volume is controlled by preset VR2. For starting the timer power is supplied by pressing switch SW1.

Parts list

Resistor (all ¼-watt, ±5%)
R1 = 1.2 MΩ
R2 = 2.2 MΩ
R3 = 56 KΩ
R4, R5, R6 = 1 KΩ
VR1 = 1 MΩ
VR2 = 1 KΩ

Capacitors
C1 = 0.01 µF
C2 = 0.22 µF
C3 = 1 µF/25V

Semiconductors
IC1 = CD4060 (CMOS oscillator /divider IC)
IC2 = UM66 (melody generator)
T1, T2 = BC547

Miscellaneous
SW1 = on/off switch
9V battery
LS1 = 8Ω, 0.5W speaker

If You Enjoyed This Project My Pleasure Take 5 Seconds To Share It.

Thursday, August 14, 2014

Build a Faulty Car Indicator Alarm Wiring diagram Schematic

Build a Faulty Car Indicator Alarm Circuit Diagram, Before taking a turn, either left or right, car drivers need to switch on the car’s turn-indicator lamps so that the approaching vehicle drivers can take precaution accordingly. An accident is likely to occur in case your car’s turn-indicator lamps fail to glow due to some reason or the other. Here’s a schema that sounds an alarm if your turn-indicator lamps don’t glow, helping you to safeguard against any accident.

When both the the front and rear turn-indicator lamps (either right or left) glow, the current through the lamps (L1-L2 or L3-L4) causes a voltage drop across series resistor R1. This voltage drives pnp transistor T1 into saturation. In this condition, pnp transistor T2 does not conduct and hence relay RL1 does not energise. No sound from piezobuzzer PZ1 (connected to normally-opened (N/O) contacts of relay RL1) means that the turn-indicator lamps are working satisfactorily.

Faulty Car Indicator Alarm Circuit Diagram

When one or both of the turn-indicator bulbs are fused, the voltage drop across R1 is insufficient and pnp transistor T1 remains cut-off. In this condition, pnp transistor T2 conducts to energise relay RL1 and piezobuzzer PZ1 sounds to indicate that one or both the turn-indicator bulbs are fused.

Install the schema (excluding turn-indicator lamps L1 through L4, which are already fitted in your car) near the driver’s seat so that the driver has easy access to blinker switch S1. To turn left, the driver needs to connect blinker switch S1 to left position to flash front and back left-turn-indicator lamps (L1 and L2). Similarly, to turn right, he needs to connect blinker switch S1 to right position to flash front and back right-turn indicator lamps (L3 and L4).

The value of resistor R1 is to be changed according to the bulb wattages.

Author: Debaraj Keot