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Archive for the ‘testing’ Category

Simulating 3-phase AC for energy monitor testing

Thursday, October 12th, 2017

Tisham Dhar blogged about his 3-phase synthesizer: Finding 3-phase is difficult, convincing the owner of the said supply to test some home made hardware is even more so. After building a 3-phase energy monitor my testing options for it appeared very limited. So I set about making my own low-cost 3-phase...

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Build your own testing/programming jig

Friday, September 22nd, 2017

Sjaak has published a new build: Inspired by an old article from sparkfun and some tests I conducted myself I came up with a PCB that holds the pogopinholders and an lasercut acrylic fixture for the PCB on top. Using the dirt(y)cheap services from dirtypcbs.com the cost for this jig, including...

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Pogo pin test board for ADB-USB Wombat

Tuesday, July 18th, 2017

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...

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Playing with a surplus E-ink module

Wednesday, May 3rd, 2017

Sjaak @ smdprutser.nl writes: When I was in China last year I sourced a couple of small E-ink displays (GDEH0124S01) through Taobao. They were simple ones with 8 14 segment characters. After some searching on the Chinese website from the manufacturer I found the datasheet. It was by all means...

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Posted in testing | 5 Comments »

DIY programming adapters

Thursday, March 23rd, 2017

Sjaak writes: Today came in a new batch of PCBs from DirtyPCB.com, of which one is a new revision of the BlackMagicProbe. This revision is almost the same except it has a polyfuse in its powersupply to the target, a dedicated voltage regulator instead of P-FET, its programming header on...

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Simple crystal tester

Monday, May 2nd, 2016

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....

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Posted in RF, testing | No Comments »

LM2596 DC-DC converter module testing

Monday, July 27th, 2015

Kerry D. Wong writes: In the video below, I tested this DC-DC converter board under various operating conditions and measured its efficiencies. To conclude, these switching regulator boards are well suited for low to medium current draw digital circuitry but for higher current applications a heat sink is needed and...

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Posted in testing | 1 Comment »

Talk SPI to EEPROM part3: Test SPI Protocol with Bus Pirate

Tuesday, May 12th, 2015

Jan Cumps tested out SPI Protocol using a Bus Pirate: It wasn't my initial intention to use the Bus Pirate. But my first naive attempts to talk from Hercules to EEPROM failed. I could create the SPI instructions with the LaunchPad, but I didn't get a reply back from the 25LC256....

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Posted in Bus Pirate, testing | No Comments »

Cheap USB LiPo charger notes

Thursday, December 11th, 2014

Jim writes: Since I use a variety of cells, I wanted to be able to charge at Chip2014under 1A. Most such charge controllers have a single resistor that programs the bulk charge current, so I looked for the datasheet to find what values I’d need for the charge currents I...

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Posted in testing | 3 Comments »

Visualizing comparator and Op Amp hysteresis

Monday, December 1st, 2014

Kerry Wong writes: Hysteresis can be added to a comparator circuit to improve its stability, especially when the input signal is noisy. In this post, we will examine the hysteresis characteristics of some common comparator and Op Amps using an oscilloscope. Perhaps the most intuitive way to visualize the hysteresis...

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Posted in testing | 2 Comments »

Tektronix RSA306 IF frequency verification

Thursday, November 13th, 2014

KF5OBS writes: After posting the teardown video of the Tektronix RSA306 USB 3.0 Spectrum Analyzer on my YouTube channel, someone asked me to verify that the IF sampled by the Linear Technology 14-Bit / 125 Msps ADC is really at 140 MHz. Using the Tektronix MDO4104B-6 and a passive RF...

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Posted in measurement, testing | No Comments »

Temperature data logger using PIC12F683 and DS1820

Monday, July 28th, 2014

Rajendra over at Electronics Lab wrote an article on his temperature logger based on a Microchip's 8-pin microcontroller, PIC12F683: A data logger is a device that records measurements over time. The measurements could be any physical variable like temperature, pressure, voltage, humidity, etc. This project describes how to build a mini...

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Posted in measurement, testing | 2 Comments »

BJT in reverse avalanche mode

Thursday, March 20th, 2014

Kerry Wong writes: Transistors operating in their avalanche regions are often used to generate fast rise pulses (see avalanche pulse generator using 2N3904). Many transistors can also avalanche when the connections to collector and emitter are reversed. When operating in reverse avalanche region, these transistors are sometimes referred to as...

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Testing of two three-phase BLDC motor drivers

Tuesday, March 4th, 2014

Kerry Wong writes: I was doing a project that needed a driver for hard disk spindle motors. While I could use a microcontroller to generate the required driving waveform sequence, keeping the waveform in sync with the motor rotation is actually quite tricky especially at higher rotation speeds. To ensure...

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Testing switch mode voltage regulators

Monday, February 3rd, 2014

Bajdi did some tests for switch mode voltage regulators: There are different types of DC-DC regulators. The most common are linear and switch mode regulators. Everyone that has tinkered with electronics has probably used a 78xx series linear regulator. They are easy to use since they don’t need any special components....

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Posted in testing | 1 Comment »

Overclocking the STM32F4

Friday, January 31st, 2014

mux writes: I've been doing some tests with the STM32F407 to see how fast it can go, STMicro has released an almost identical one that runs at 180MHz, is it a marketing thing ? will they release a 200MHz version in a few months? who cares, anyway, I was able...

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Posted in testing | 1 Comment »

Resistor reels just arrived

Thursday, January 9th, 2014

63 resistor reels just arrived for a test 0603 OOMP part book. Books and sheets should be here tomorrow. We'll stuff some samples and get an idea of the time involved this weekend if everything goes smoothly.

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Posted in components, testing | 4 Comments »

Kevin’s LED tester

Monday, December 9th, 2013

Kevin Rye designed a simple LED tester:I decide to put together a small LED Tester board. It’ll be powered by a small coin cell battery. I can pick up an LED with a pair of tweezers and just simply tap it to the solder pads. If it lights up, I...

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Posted in LEDs, testing | 7 Comments »

FT230X charger detection investigation

Tuesday, November 12th, 2013

Baoshi writes: I bought some FT230X (FT230XS) USB-USART bridge chip recently for a new design.  FT230X is not only cheaper than the traditional FT232RL, but also offers a new fancy “USB charger detection” function. This interests me because I’m quickly running out of desk space and power socket. I wish...

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Posted in testing | 2 Comments »

Making your own test leads

Monday, October 14th, 2013

Viktor wrote a post on his blog detailing his DIY test leads: The result is that now I have proper test leads with resistance of less than 0.1 ohm per meter. This is a measurement of one of my new test leads Also, with this method now I can have as many test...

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