Forum Diagram: tester

Showing posts with label tester. Show all posts

Monday, November 17, 2014

LM3914 IC based on Simple Battery Tester

This circuit employs the popular and easy to find LM3914 IC. This kind of IC is quite very simple to drive, requires no voltage regulators (it features a built in voltage regulator) and can be powered from almost every resource.

This LM3914 IC based on Simple Battery Tester is very simple to explain:
Once the test switch is pushed, the Car battery voltage is supply into a high impedance voltage divider. His function is to divide 12V to 1, 25V (or lower values to reduced values). This solution is much better than enabling the internal voltage regulator set the 12V sample voltage to be feed into the internal voltage divider simply because it cannot regulate 12V if the voltage falls lower (linear regulators only step down). Simply wiring with no change, the regulator provides secure 1, 25V which can be fed into the precision internal resistor cascade to create sample voltages to the internal comparators.

In any case the default establishing let you to determine voltages between 8 and 12V however you can measure even from 0V to 12V setting the offset trimmer to 0 (but i believe that below 9 volt your vehicle would not start). There is a smoothing capacitor (4700uF 16V) it is used to adsorb EMF noises produced from the ignition coil if youre testing the battery during the engine working. Diesel engines would not need it, but i am not sure. If you want more a level graph rather than a bar graph simply disconnect pin 9 on the IC (MODE) from power. The calculations are usually simple (default).

Tuesday, November 4, 2014

IR Remote Control Tester

Here’s a simple, low cost, and easy to construct infrared remote control tester. The tester is built around an easily available infrared receiver module (TSOP 1238).

IR Remote Control Tester Circuit diagram:

Normally, data output pin 3 of the IR receiver module is at a high level (5 volts)and as such driver transistor T1 is in cut-off state. Whenever the IR receiver module receives a valid (modulated) infrared signal, its data output pin goes low in synchronism with the received infrared bursts. As a result, transistor T1 conducts during negative pulse period and the.LED blinks to indicate reception of signals from the remote such as TV remote control. A miniature active buzzer is connected at the collector of transistor T1 for audio indication.

The 5V DC for energizing the circuit is directly derived from the 230V AC mains supply. Unlike the conventional resistive voltage divider, a capacitive potential divider is used here, which does not radiate any heat and makes the tester quite compact. Another advantage of this tester is no false triggering due to the ambient light or electronic ballast-operated tubelights. A suggested enclosure for the circuit is shown in Fig. 2.

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

Wednesday, August 20, 2014

TV remort tester

Today Im going to give you a very useful schema diagram .It is TV remote tester schema diagram.Sometimes you are unable to check whether your TV remote is working or not.Not only T.V remote you can check any IR signals.Here I have used very common transistor BC 558

Note

# This schema operates with 6V

# Do not supply over 6V

# Build this schema on a pcb

Tuesday, August 19, 2014

Elco tester circuit

Elco testing small to use AVO meters. But to distinguish between the elco elco 20.000uF/50V 2200uF/50V size would be very difficult, perhaps this phenomenon that makes creative hands itch to make elco with two label values.

Scheme tool as follows, do not smile once, indeed simple. The cost to make it too cheap, not up to $ 1.

Elco tester circuit

The workings of this tool based on the nature of the condenser, the condenser ability to store electrons / voltage. Since each condenser has the characteristic charging time and discharging time is different for each size and type dielektrika. Ideally, the larger size, the greater the time required for charging and discharging (charging and disposal charges).

How to use:

Make sure the position of the switch (SW1) on the discharging position (position A).
Connect / elco pairs that will be tested, then empty the contents briefly elco by pressing SW2 (approximately 1 to 3 seconds).
Position the switch in the charging position (position B), the LED will light with a certain time (depending on the value elco). Hold in position B until the LED is not lit (elco is full).
When the LED is not lit, immediately moved to the position of discharging position (A), the LED will light with a certain time (depending on the value elco tested). Hold in position A until the LED does not turn on again (fill elco is empty).
The conclusion is quite simple, the larger the size elco, the longer the charging time and dischargingnya (old LED lights up). To calibrate it, readers can use the benchmark elco 10000uF size that can be justified. Only by logic alone writers think readers have understood.

If it is the process of charging and discharging too quickly, the reader can change the value of R1, the greater the value the longer the charging process and discharging.

Good luck and commanded me, the value of its components should not be deleted, do not be wrapped up neatly, keep the same cast in epoxy / cement.