This article describes a simple continuity tester based on an ATtiny85. The tester features a buzzer that sounds to help you determinate the trace continuity. It is designed for checking circuit wiring, or tracing out the tracks on a PCB. According to it’s author David Johnson-Davies it has a low threshold resistance of 50Ω to avoid false positives, and passes less than 0.1mA through the circuit under test, to avoid affecting sensitive components. It’s powered from a small button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch.
Tag Archives: tester
HPS140MK2 is a 11.4 x 6.8 x 2.2 cm versatile component tester that fits in your pocket. This small oscilloscope features a real time 40 MS/s sampling rate with up to 10 MHz bandwidth and 0.1 mV sensitivity.
- 40 Mega samples/sec in real time
- Bandwidth up to 10 MHz
- Full auto range option
- Sensitivity down to 0.1 mV
- Signal markers for amplitude and time
- Memory hold function
- Direct audio power measurement
The device is powered by 4 AAA batteries. On the front panel you can find four buttons; menu, up, down, and hold. The display is used to menu options and received signal. On the top side you will find an on/off switch and a BNC input connector that can accept maximum input of 100Vp.On the bottom side there is an X10 probe test signal.
- Bandwidth: up to 10 MHz (-3dB or -4dB at selected ranges)
- Input range: 1 mV to 20 V / division in 14 steps
- Input coupling: DC, AC and GND
- Real-time sample rate up to 40 MS/s
- AD resolution: 8 bits
- Time base: 250 ns to 1 h per division
- Auto set-up function (or manual)
- Probe x10 readout option
- Readouts: DC, AC + DC,True RMS, dBm, Vpp, Min-Max. (±2.5%)
- Audio power measurement from 2 to 32 ohms
- Hold & store function
- Time and voltage markers readout
- Max. 100 Vp AC + DC
- Monochrome OLED
- Power supply: 4 x 1.5 V AAA batteries (not incl.)
- Operating time: up to 8 hours on quality Alkaline batteries
- Dimensions: 114 x 68 x 22 mm
- Weight: 166 gr
- Current consumption: max. 150 mA
The product is available for $150 on Velleman store. Additional parts will be available soon including component tester ‘HPS141’ to receive all useful information about resistors, transistors, diodes and more, including their pin out identification, and the ‘HPSP1’ protective pouch.
TallMan’s lab @ runawaybrainz.blogspot.com build a nice looking and simple analog ESR capacitor meter based on a EEVBlog forum topic.
I finally got round to making my capacitor ESR tester this week after finding a nice simple 5 transistor version by EEVBlog member Jay_Diddy_B. Unfortunately, for me, the design was only SMD so, I decided to replicate his schematic in Eagle PCB using a through hole component design.
Analog Capacitor ESR Tester – [Link]
mozzwald.com has designed an iphone battery charger /tester.
I have seen technicians often replace batteries when they may not necessarily need to be or ignore the fact that they could be the cause of the issue at hand. To remedy this I designed a basic iPhone battery charging breakout board system. The system can charge a battery, has the option for expansion to support newer/other batteries and breaks out the battery status pins which can be read from a microcontroller or some other means. It consists of 6 battery connector boards (iPhone 4, 4S, 5, 5S/C, 6, 6+) and a main charging board.
iPhone Battery Charger / Tester – [Link]
davedarko wanted an easy way to check a USB cable, so he created this project:
A little ATtiny45, some LEDs and transistors – battery powered. It scans through the cable with some blinking LEDs, then goes to sleep.
USB Cable Tester – [Link]
David @ robotroom.com build a microcontroller based LED tester with LCD display that shows the LED voltage, the current limit in mA, the desired led voltage and the calculated resistor value. The LED tester is based on ATtiny84 mcu which performs all the measurements and calculations and updates the display. Build details on the link below.
The adjustment trimpots are on the end of the tester. The trimpot with the thumb dial is to indicate the target circuit voltage (usually 5 V or 3.3 V). The other trimpot requires a screwdriver, because it controls current, which I usually want to keep at 20 mA.
LED Tester with LCD Display – [Link]
baweja_akshay @ instructables.com has build a ATMEGA328 component tester that is able to test Resistors, Capacitors, Inductors, BJT, FET, Thyristors and more.
Coming upon COMPONENT TESTER so it can test almost everything, obviously not the power components because they require more current and power which our AVR Microcontroller couldn’t handle !! Oh yeah, I forgot to tell you guys that we would be using an ATMEGA328 for our build !!
ATMEGA328 Component Tester – [Link]
Alan Parekh @ hackedgadgets.com has a review of a cheap component tested he found on ebay. This device can test bipolar transistors, MOSFET, diodes, thyristors, resistors and capacitors. He writes:
This is an inexpensive component tester called the FISH 8840 which you can find from many online eBay retailers for around $30. The interface is very simple, attach a device to be tested and press the test button. It turns off after about 20 seconds, pressing the off button puts it into sleep mode immediately. There is a ZIF socket that allows you to insert leaded devices and pads that allow you to press SMD devices directly onto the tester.
Component Tester FISH 8840 Review – [Link]