Having good contacts is important not only in your daily life, but also in electronics. In contrast to social contacts, the reliability of electrical c...
This article describes the Servo Tester (CD4538). The principle is very simple, very practical. The circuit components can help you understand better g...
This continuity tester not only show if a connection is continue or not, but also determine the range? of? its conductivity level. Here is the schemati...
This was a Student Project of mine, it is a very basic instruments that could do most of the tasks on a test bench. The cabinet used, was available as ...
This article describes a 40khz IR Tester (IRFZ44N). The content is very simple, very practical. The components of the article can help you understand b...
This is a 20 Tera Ohm Insulation Tester I made around 20 Years Back. It had even Polarization Index for Transformer Insulation. It generated 1000V DC R...
Figure 1 The circuit has been constructed to test and measure the voltage rating of zener diodes. 555 Timer – an 8-pin electronic device used in seve...
After project source code is developed there is always need to flash it to microcontroller. There are few ways to program AVR microcontrollers. Usually...
This article describes the Microphone Circuit Test Oscillator (LM1458). The content is very simple, very helpful. Components in this article can help y...
The compact test probe provides rapid `measurement` of voltage levels at digital gates, fuses, diodes, batteries, and others. It does not provide absol...
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...
Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence...
For those of us who dont like to get their hands dirty, this simple soil moisture tester quickly checks the state of their plants and how much attentio...
Circuit diagram Parts R1 1K R2 2K2 R3,R4 22K R5 2K7 R6,R7 56K R8 *See text C1,C2 22nF D1,D2 1N4148 Z1 8V2, 1/4 watt T1 2N3905 (PNP) T2,3,4,5 2N3904 (NP...
This simple circuit tests speakers, microphones, transformers and voltage. It's basically a very low frequency oscillator that produces extremely short...
View Full Size Image View Original Datasheet The LTC1966 is a true RMS-to-DC converter that utilizes an innovative patented DS computational technique....
The UC1825 family (UC2825, UC3825) are PWM control ICs designed for use in applications such as current-mode or voltage mode systems. The following cir...
Traction battery packs test chip produced by America Dallas company has rich function, and itis convenient to achieve monitoring the running state of e...
SCR TESTER CIRCUIT The Device under test cathode, anode and gate are connected to the units CATHODE, ANODE and GATE terminals, respectively. PARTS LIST...
Description: A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections. Circuit diagram Notes: This simple circui...
Tools that features equivalent of a professional, easy to use, cheaper, and more importantly, safe for use. For checking to find AC 220 Volt or 120V or...
Description Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing th...
LDR (light dependent resistance) can be very easily tested by using a digital multimeter. We all know that the resistance of an LDR varies according to...
This circuit to Test Transistor in Circuit (PCB) Easy to use. It useIC 4011or CD4011 or MC14011 or TC4011 , very low cost. Supply volt 9V. Related Link...
At the heart of the cable tester are two op amps, which are used as a window- comparator to indicate a short- or open-circuit condition. A third op-amp...
This article describes the Concentration test circuit (BC548). The content is very simple, very helpful. Components in this article can help you unders...
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or ...
The circuit is simple and foolproof if wired correctly. Under normal conditions, only lamps 1 and 3 should be lit. If lamp 2 comes on, the cold lead is...
This is the test concentration range, is ideal for a player to a game. Without a Net Amri alarm will be heard immediately. Operation of the circuit is ...
Since the NE570 known to be a useful low cost dual gain control circuit, this compressor or compandor device used to be applied in cellular and radio c...
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