Checker Circuits
- Page 8-
This design will interest technicians who work on pneumatically operated valves and other 4-20mA current loop controlled devices. Although 4-20mA signal i.... -
This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output current of the opamp flows through the diode and R2. The voltage drop.... -
Is the battery empty, or is there something wrong with the device? That s always a difficult question when your walkman or some other battery-powered devi.... -
Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charge.... -
This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it.... -
You don t need access to fancy test gear to check and fault-find computer data cables. Instead, this simple device will give a quick indication of the sta.... -
The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse.... -
This small circuit is ideal for checking the basic operation of an infrared remote control unit. The circuit is based on the brilliantly simple idea of connecting a piezo buzzer directly to an IR receiver IC. This method is almost as simple as connecting a.... -
A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irreversibly: the resulting current will remove the tracks. The alternating voltage should contain not.... -
The continuity tester is a handy adjunct to an ohmmeter. The unit or component whose continuity is to be checked is connected between terminals E1 and E2.... -
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other.... -
Everybody who regularly works with servos will know several instances when such a servo tester will come in handy. The function of a servo tester is to generate a pulsing signal where the width of the positive pulse can be varied between 1 and 2 ms. This.... -
This circuit came from a need for a quick and dirty network tester that could be operated by one person. All the commercial units I tried required a per.... -
This circuit came from a need for a quick and dirty network tester that could be operated by one person. All the commercial units I tried required a person at the other end to check the remote LEDs, as the transmitters could not be made to cycle through.... -
In the circuit here it simply biases the BC558 which, in turn, makes LED D1 flash in sympathy with the telegram from the remote control. The preset in the circuit determines the sensitivity... -
The circuit in the diagram is a very handy tool for rapidly checking all kinds of thyristor (SCR, triac, ). In case of a triac, all four quadrants are te.... -
You cannot use a multimeter to check a crystal. You should have a this circuit, because it can check a crystal 100Khz to 900Mhz, easily to make and cheap.The.... -
The circuit tests a flyback transformer of the televisions that the result is a simple, easy and cheap to build. One of my friends is TV repairman colors -.... -
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 call.... -
This is the Transistor tester into the Circuit or PCB. When your project do not works, the tester electronic parts or.... -
Designing a true constant-current AA NiMH charger, and want to select a power supply that will be just right. I want a high enough voltage to that the CC transistor doesn`t saturate, yet low enough voltage to reduce the power dissipation in the transistor. I.... -
Here is a handy gadget for test- ing of infrared (IR) based re- mote control transmitters used for TVs and VCRs etc. The IR signals from a remote control transmitter are sensed by the IR sensor module in the tester and its output at pin 2 goes low. This in.... -
The first timer IC555 creates a negative trigger signal of approximately 45Hz (a trigger impulse every 22ms, DO NOT exceed 50Hz for proper servo function). The second timer IC555 modulates a positive square signal from 0. 9ms to 2. 1ms every 22ms, a method.... -
12V Vehicle Electrical Wiring Tester Circuit This little tester is useful for checking vehicle electrical circuits. Two LEDs indicate whether.... -
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.... -
Infrared Remote Control Tester Circuit This is a simple circuit you can build in order to test infrared remote controls. The circuit uses an.... -
SCR TESTER CIRCUIT The Device under test cathode, anode and gate are connected to the unit`s CATHODE, ANODE and GATE terminals,.... -
Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during.... -
FETs can be found in the power section, LCD inverter, UPS, Amplifier, Monitor B+ and S-correction circuit, ATX power supplies and etc. When this component fails, one has to use a meter to test it to check if it is good, shorted, openor leaky. The meters can.... -
Logic testers are simple but very helpful devices in testing digital circuits. A logic probe can be designed in many different ways. In this particular des.... -
This small InfraRed Remote Control Tester circuit is used for checking the operation of an infrared remote control unit. The circuit is based on the idea of connecting a piezo buzzer directly to an IR receiver IC. The TSOP1738 integrated IR receiver accepts,.... -
This is a multifunction RJ45 network cable tester. It is the design of the network cable (RJ45) test, and telephone (RJ11). It is cheap and easy to use. It works for network, telephone, cable with RJ45 half Registered Jack plug immediately indicate whether....
New Circuits
-
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
A simple, time-honored approach is to use one or more 74*245 chips (normally the 74AC245 is...
Interested in starting an intro electronics project using a IR sensor and am having a little...
The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio...
This article describes the Low dropout voltage regulators circuits (LF353DRG4). The content is...
Michelson was the inventor of a unique interferometer that opened up new vistas in the science of...
A 1998 tracker it has 1. 6 multifuel port injection system. The vehical is hard to start. when we...
The schematic for controlling the motors is split up into three main parts, with each part having...
AC to DC circuit is a sinusoidal alternating current into direct current crossing the circuit, if...
Cats are predators of rats, the use of electronic devices to simulate mew Repeller is an...