Showing posts with label continuity. Show all posts
Showing posts with label continuity. Show all posts
Tuesday, October 28, 2014
LM3909 bassed Continuity tester circuit diagram
A very simple continuity tester electronic project can be designed using the LM3909 LED flasher integrated circuit .
This continuity tester project , require few external electronic parts and can be used for testing continuity of coils and cables .
This continuity tester project must be powered from a 1.5 volt DC power supply , you can use a 1.5 volts battery cell .
The C1 capacitor must have a value of 10uF an R1 resistor must a have a value of 1kohms . Speaker used for this project can be a small 8 ohms impedance speaker .
![Simple]()
Tuesday, September 9, 2014
Test Multiteste LEDs Polarity Continuity Resistance Circuit
What do you think of building a simple LED tester, so you can test the integrity of the components before soldering directly to the PCB. It reduces the task of testing the meter components using the schema with LED gives an indication about the good or bad condition of the component.
Test Multiteste LEDs - Polarity - Continuity - Resistance Circuit
When a component is placed in the schema and establishes electrical continuity T1 receives base current through R1. When T1 conducts, the green LED turns on and off the red LED. This indicates that the component to be tested is good. If the component is bad, will not have electrical continuity and T1 remains off. In this state only the red LED light indicating that the component is bad.
Polarity
Connect the red end of the positive range to the schema board and to test the black edge point. Circuit board under test to be lit
Green LED ON - positive feed. Green LED off and red LED - or no negative supply voltage.
Connect the red end of the positive range to the schema board and to test the black edge point. Circuit board under test to be lit
Green LED ON - positive feed. Green LED off and red LED - or no negative supply voltage.
Continuity
Connect both ends red and black throughout the test points
Green LED-Continuity. LED red if there is no continuity
Resistor. 1 ohm to 500K
Alloy ends red and black on each side of resistor
Green LED Resistor-OK. Green LED off and red LED Resistor burned
Connect both ends red and black throughout the test points
Green LED-Continuity. LED red if there is no continuity
Resistor. 1 ohm to 500K
Alloy ends red and black on each side of resistor
Green LED Resistor-OK. Green LED off and red LED Resistor burned
Electrolytic capacitor
Red probe tip to positive and black for negative capacitor.
Green LED turns on and off gradually and then red lights, Capacitor good. Red LED lights up steadily bad capacitor
LED diodes, photodiodes, infrared diodes
The Red pontaa probe anode and cathode Black
Green LED - LED Good and Green LED off and red LED diode, or LED bad
Change the direction of the tips. If the green LED diode or LED is open
LDR
Tips in red and black leads of the LDR
Under the light, green LED and red LED fading. covering the LDR with your hand. Green LED off LDR good
Red probe tip to positive and black for negative capacitor.
Green LED turns on and off gradually and then red lights, Capacitor good. Red LED lights up steadily bad capacitor
LED diodes, photodiodes, infrared diodes
The Red pontaa probe anode and cathode Black
Green LED - LED Good and Green LED off and red LED diode, or LED bad
Change the direction of the tips. If the green LED diode or LED is open
LDR
Tips in red and black leads of the LDR
Under the light, green LED and red LED fading. covering the LDR with your hand. Green LED off LDR good
Subscribe to:
Posts (Atom)
