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 Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor condu...
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 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...
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 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...
This is a temperature measurement circuit using thermocouple. This is a low-frequency application. It will allow theOPA335to be switched directly into ...
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...
The following circuit schematic illustratesvoltmeter hookups for voltage drops testingof a General Motors (GM)-type cranking circuit. As we know, volta...
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...
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 – ...
This article describes the Cheap AC Current Measurement (OC28). The principle is very simple, very practical. The circuit components can help you under...
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 ...
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...
This article describes the SDR Soundcard Tester (NE555). The principle is very simple, very practical. The circuit components can help you understand b...
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 ...
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. ...
This circuit can detect repeatability of bubart system level and pulse. Because indicator light drived by switch transistor Q3 is very light, whenthis ...
This article describes Test Beeper For Your Stereo (TL081). The principle is very simple, very practical. The circuit components can help you understan...
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...
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...
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 ...
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...
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...
Acoustic check of transistor and diode junctions, Also suitable as continuity tester Short circuits or broken pcb tracks can be easily recognized by me...
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...
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...
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 circuit The circuit for aLRMMdescribed here is simple and has the following advantages over other meters: * No zero knob...
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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