• DIY AVR Graphical LCD test board

    2016-01-23 23:43:0771

    Once Ive got several HQM1286404 graphical LCD displays around so I decided to build a prototyping board where I could easily plug LCD to it, read data ...

  • In-Circuit Transistor Tester

    2016-01-23 22:19:3581

    In Circuit Transistor Tester Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor condu...

  • Transistor sorter-tester

    2016-01-23 20:43:4467

    This tester checks transistor for polarity (PNP or NPN). An audible signal will give an indication of gain Tester can also be used as a GO/NO GO tester...

  • TRANSISTOR TESTER Circuit

    2016-01-23 20:01:3379

    TRANSISTOR TESTER Circuit The 555 operates at 2Hz. Output pin 3 drives the circuit with a positive then zero voltage. The other end of the circuit is c...

  • The Facebook Wall Caption Contest

    2016-01-23 18:59:2060

    WINNER ANNOUNCED Hi friends, The winner is Indrajit Biswas (http://www.facebook.com/indrajit45) We have contacted him over Facebook. Now awaiting his r...

  • Zener Tester

    2016-01-23 18:40:4065

    Zener Diode Tester Circuit This tester helps to check the voltages of zener diodes. It is very inexpensive and? handy to find the voltages of small gla...

  • Temperature Measurement via Thermocouple

    2016-01-23 18:15:14110

    This is a temperature measurement circuit using thermocouple. This is a low-frequency application. It will allow theOPA335to be switched directly into ...

  • Intersil ICL7106 Typical Applications, Test Circuits and Dat

    2016-01-23 16:19:4965

    Here is the picture ofICL7106 Typical application and Test Circuits in the ICL7106 Datasheet. This device was the first IC contain all the active circu...

  • Voltage Drop Testing of General Motors Type Cranking Circuit

    2016-01-23 14:26:5864

    The following circuit schematic illustratesvoltmeter hookups for voltage drops testingof a General Motors (GM)-type cranking circuit. As we know, volta...

  • 2-Channel ADC Measures Differential Temperature from Bridge

    2016-01-23 14:07:5360

    View Full Size Image View Original Design Note The LTC2402 is a 2-channel 2.7V to 5.5V micropower 24-bit analog-to-digital converters with an integrate...

  • Zener Diode Voltage Tester

    2016-01-23 11:31:1466

    Figure 1 The circuit was designed to provide a means for measuring the operating voltage of zener diodes before applying on a circuit. Zener Diode – ...

  • Cheap AC Current Measurement(OC28)

    2016-01-23 11:15:4666

    This article describes the Cheap AC Current Measurement (OC28). The principle is very simple, very practical. The circuit components can help you under...

  • Sense of Time tester circuit.

    2016-01-23 10:36:1764

    Description. When S2 is ON ,the circuit here operates as an astable multi vibrator and the LED is lit for about o.1sec,flasing every 1.5 seconds.Since ...

  • Battery Tester

    2016-01-23 10:11:1467

    This battery tester makes use of an LM3914 bar-graph driver IC. SI selects load on battery under test and programs the volta ge range. S2 loads the bat...

  • SDR Soundcard Tester(NE555)

    2016-01-23 09:13:4370

    This article describes the SDR Soundcard Tester (NE555). The principle is very simple, very practical. The circuit components can help you understand b...

  • Polarizer test

    2016-01-23 08:08:1163

    I used simple lamp directed to glossy table surface. One polarizer is in front of lamp and other is in front of lens of digital camera. Both polarizes ...

  • Stereo balance tester

    2016-01-23 07:59:3861

    The meter will show volume and tone control balance between left and right stereo amplifiers. For maximum convenience the meter is a zero-center type. ...

  • Test probe circuit

    2016-01-23 07:52:4068

    This circuit can detect repeatability of bubart system level and pulse. Because indicator light drived by switch transistor Q3 is very light, whenthis ...

  • Test Beeper For Your Stereo(TL081)

    2016-01-23 07:02:04101

    This article describes Test Beeper For Your Stereo (TL081). The principle is very simple, very practical. The circuit components can help you understan...

  • Potted Plants Water Tester Introduce The Principle

    2016-01-23 06:42:3661

    This article describes is check whether there is water potted plant equipment principle. The device is simple: you put two probes (clips) to potted pla...

  • Transistor Tester

    2016-01-23 04:40:0071

    We can use this basically a high gain amplifier with feedback circuit to cause the LED flash at rate determined by the 10u and 330k resistor. Before in...

  • XTal Tester

    2016-01-23 04:30:5864

    Circuit diagram This is a simple XTal tester circuit. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal ...

  • Mosfet Tester electronic circuit diagram

    2016-01-23 03:43:3072

    This is a variation on the astable multivibrator. Circuit was recently developed to test for N-mosfets(the power kind e.g irf830) I do not claim circui...

  • How to test a triac.

    2016-01-23 02:04:2463

    Testing triac using a multimeter. A multimeter can be used to test the health of a triac. First put the multimeter selector switch in a high resistance...

  • Quick On-Board Junction Tester Circuit Diagram

    2016-01-23 00:20:2464

    Acoustic check of transistor and diode junctions, Also suitable as continuity tester Short circuits or broken pcb tracks can be easily recognized by me...

  • Testing a UJT

    2016-01-22 22:13:4865

    UJT (Uni junction transistor) can be easily tested by using a digital multimeter.The three steps for testing the health of a UJT are as follows. 1. Mea...

  • Crystal Tester Circuit

    2016-01-22 20:44:1765

    Ql acts as a Colpitis crystal oscillator, and if the crystal under test is operational, the RF signal is rectified by D1 and D2, turning on Q2 and ligh...

  • 220v AC Operated Remote Tester(TSOP1738)

    2016-01-22 20:09:2890

    This article describes a 220v AC Operated Remote Tester (TSOP1738). The principle is very simple, very practical. The circuit components can help you u...

  • Low Resistance Measuring Meter

    2016-01-22 19:26:4167

    Low resistance measuring meter circuit The circuit for aLRMMdescribed here is simple and has the following advantages over other meters: * No zero knob...

  • Wire Continuity Tester by LM709

    2016-01-22 19:13:1168

    Figure 1 Wire Continuity Tester : While detecting discontinuities on a circuit board, it is probable to include resistors, semiconductors or other elem...

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