James made this automatic keyboard switch tester, that is available on GitHub: It uses a servo to turn a robotic finger that slowly presses the switch down. When it detects that the switch has closed, it lights up the LED and waits 100 ms for the contacts to settle, before slowly releasing the switch until […]
Tag Archives: tester
Network cable tester
Dilshan Jayakody writes, “This is an automatic Cat6 / Cat5 network cable tester designed using NE555 timer and 4017 decade counters. This unit test all 8 wire lines of twisted pair network cable and indicate pass/fail status with single LED. We design this unit to test network connectivity issues in Cat6 / Cat5 cable systems […]
Pogo pin test board for ADB-USB Wombat
A pogo pin tester for the ADB-USB Wombat board from Big Mess o’ Wires: Here’s a test rig for the ADB-USB Wombat board: my first-ever project whose sole purpose is to facilitate testing of another project. It uses spring-loaded pogo pins to create a bed of nails that fit into test points on the Wombat board. […]
Simple crystal tester
Dilshan Jayakody writes: This is simple Colpitts oscillator to test commonly available passive crystals which range between 2MHz to 27MHz. This unit must connect to an oscilloscope and/or frequency counter to get the frequency of the crystal. This circuit is design to work around 9V to 12V DC power source. Both 2SC930 transistors can replace […]
USB power supply active load tester
Sasa Karanovic has designed and built a DIY USB power Supply active load tester, that is available at GitHub: USB Power supply Active Load Tester or short PAL Tester is unit designed for testing the quality of the power supplies. Idea was to create low-cost, precise device for simultaneous measurement of Voltage and Current drawn […]
Simple SMD LED tester
Peter over at Electronics-Lab posted an article describing how he designed and built his simple SMD LED tester: This project is a simple LED tester and LED polarity checker. It can be used to check 1206, 0805, 0603 and 5mm LEDs. All parts are readily available and they are very cheap. Usage is very simple. Just press the […]
Inductor saturation tester
In relation to the previously posted Power inductor checker, Lindsay refers us to Alan Yates’ article on inductor saturation tester: As a result of recent work on switchmode power converters I needed the ability to measure the saturation properties of inductors. This simple instrument was built to allow visualisation of the current ramp as an inductor charges from […]
Transistor tester project
Hemal Chevli blogged about his transistor tester project: It has mega-8 as the brain, lcd to show specs of the transistor like which pin is which, what type of transistor it is eg NPN,PNP, N-MOSFET,P-MOSFET, etc., many components can be tested like different types of transistor, diodes, resistors etc, the good thing about this is that […]
PCB a Week 20: LEDger Led (polarity) tester
Mats continues his challenge of designing one PCB every week. In week 20 he came up with LEDger Led (polarity) tester: Everytime I solder a SMD LED on a pcb I have to turn on one of my multimeters and flip it over to diode-test mode and then probe the SMD LED to see which […]
USB current and voltage tester designed on the DP5031 standard PCB
Here is TitanMKD’s USB current, and voltage tester designed on the DP5031 standard PCB. The board features 4 standard USB connectors, while voltage and current can be measured via 4mm banana terminals For those interested in a cheap funny board to test USB current consumption/voltage or even check USB D+/D- and ID signal The goal […]
Test Nixie tubes with a flip of a switch
This Nixie tube tester has an 11 position switch to change the displayed digits. A simple device for testing and/or healing Nixie tubes of IN-18 type. An 11-pole switch is connected in series with a 50 KΩ pot (+ 470 Ω resistor for safety), powering from an 180V DC source. Normal operation at 2 mA […]
Prototype: Flash_Destroyer
The most recent documentation is now on the wiki EEPROMs, such as flash memory, store data in electronic devices like cell phones, smart cards, SD cards, and solid-state drives. This type of memory can only endure a limited number of writes, it will eventually wear out and it won’t store new data. The Flash Destroyer […]