Showing posts with label tester. Show all posts
Showing posts with label tester. Show all posts
Thursday, November 7, 2013
Michas AVR Transistor tester
Everyone knows the problem: you have a transistor, but you can not read the signature. Or you can not find the datasheet. You have a diode or you have a capacitor, but you can not read ... Here is the solution smarty.
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| Michas_AVR-Transistortester |
Features:
* Automatic detection of NPN and PNP transistors, N-and P-channel MOSFET, the diode (including the double diode), thyristor, triac and resistor.
* Automatic pin detection and reporting of test components
* Detect and display protection diode and the MOSFET transistor
* Determination of the amplification factor and the forward base-emitter voltage of transistor
* Measurement of threshold voltage and gate capacitance of MOSFET
* Show the value of the text-LCD (2 × 16)
* One-button operation, automatic shut-off
* Power consumption in off mode: <20 nA
This tester also supports measuring the diode, R / C testing, and many other components identified.
Tuesday, November 5, 2013
IC 555 Tester Circuits
555 timer tester is a simple circuit that serves to test the condition of IC 555. 555 timer circuit tester, in principle, start the timer 555 in astable multivibrator mode. As an indicator of the status of the timer 555 good condition or damaged to use 2 pieces LED which will light up in a blink alternately when the timer 555 in good condition. And only one will turn on or off all the timer 555 when the condition is broken. 555 timer circuit tester is powered using 9 Volt DC voltage source.
Complete circuit tester 555 as follows.
How to use 555 timer tester is in conjuction with IC 555 to test the existing IC socket according to the order button. Then activate the power switch to begin testing the 555 timer ic. Then live we observe the LED indicators 2 before, whether flashing alternately (good) or not blink or even die all (timer 555 damaged).
source:link
source:link
Thursday, October 24, 2013
Zener Diode Tester Schematic
Using electronic scheme below can be designed a zener diode tester using few electronic parts. Using this zener tester and a multimeter can be measured and determined with a high precision threshold voltage of a zener diode.Zener voltage can be read with a DC voltmeter connected in parallel with zener diode.
Zener Diode Tester Circuit Schematic Diagram
If contact S1 is closed, the resistance R1, T1 and Zener diode current flow. Base transistor T1 is connected to power supply trough the R4, so the transistor conducts.
Zener current is equal to the ratio of base-emitter voltage of Q2 and the resistance value R1. With a supply voltage of 25 volts at the actuation keys S1-S3, the current through zener diode take values of about 2.2,6 and 22mA. Resistances R2 and R3 or a combination of R1, R2, R3 can be connected in place of R1 with S2-S3 so that through the zener diode constant current flow.
Thursday, October 17, 2013
IR Remote Control Tester
As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is used in the differential mode to amplify the pulses of current from the photodiode. LED1 is an ordinary coloured led which will light when IR radiation is being received. The output of the opamp, pin 6 may be connected to a multimeter set to read DC volts. Infra red remote control strengths can be compared by the meter reading, the higher the reading, the stronger the infra red light. I aimed different remote control at the sensor from about 1 meter away when comparing results. For every microamp of current through the photodiode, about 1 volt is produced at the output. A 741 or LF351 will not work in this circuit. Although I have used a 12 volt power supply, a 9 volt battery will also work here.
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