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3 Feb 2012

Here is an interesting electronics gadget. It’s a semiconductor component tester that displays the type, pinout, and some relevant specifications of the device connected to its probes. [via]

It doesn’t matter how you connect the test clips to the component, the Atlas DCA can analyse a vast number of different component types including bipolar transistors, enhancement mode MOSFETs, depletion mode MOSFETs, Junction FETs (only gate pin identified), low power thyristors and triacs (less than 5mA trigger and hold), diodes, multiple diode networks, LEDs, bi-colour and tri-colour LEDs. It will even identify special component features such as diode protection and shunt resistors in transistors.

Semiconductor analyser determines part type and value - [Link]

3 Feb 2012

dangerousprototypes.com writes:

Zipppys123 is building a DIY ultrasonic range finder based on this design. Once it’s externally triggered a PIC12C508 is used to generate generate the ultrasonic pulse, and measure its echo.

The ultrasonic pulse is amplified using a MAX232 TTL-to-RS-232 level converter, while the echo is amplified and demodulated using two op-amps and comparators.

DIY ultrasonic range finder - [Link]

2 Feb 2012

Ejberg.dk has developed this project for a simple ATtiny2313 based servo tester – [via]

Ejberg.dk has developed this project for a simple ATtiny2313 based servo tester.

This device lets you test servos by varying the pulse width between limits of 0.8000 ms and 2.2000 ms selectable through the use of four buttons.

While the schematic shows an Atmel AT90S2313, the circuit will work with the popular ATtiny2313 using version 2.05 of the code downloadable from the ejberg site. He also has another version of this tester known as the ServoTester2 which uses the ATmega16P.

ATtiny2313 based servo tester - [Link]

2 Feb 2012

Charalampos Andrianakis writes:

When i was using operational amplifiers at school lab i wanted a function generator at home to play with and work on circuits with Op Amps for better understanding. So i found on the internet a free function generator circuit which uses the IC XR-2206, i printed the PCB with my UV epxosure box, i bought an enclosure box, i put everyhting inside and here is the result.

The function generator can generate Square, TTL, Sine and Triangle waveforms from 1Hz to ~1Mhz with Voltage regulation to Square Sine and Triangle waveforms.

XR-2206 Function Generator - [Link]

2 Feb 2012

Charalampos Andrianakis writes:

Autonomous live tracking weather station. It takes (analog/digital) measurements and sends them to a web server over GPRS. Adding a battery and a solar station you can make it fully autonomous. It supports up to 3 Analog or Digital inputs. The main brain is the PIC 16F877A which also drives the SIM900/300 GSM module which is placed in the back of the PCB.
The main purpose of this project is to take wind flow measurements of different locations and store them in a database remotely. By this you know if the locations are appropriate for future installation of wind generators.

The data send from GSM to Web server with GET requests which isn’t the safest and best way but its an easy way to make it work. The example code you can find at the github is a very simple example and has no security responsibility.

GSM/GPRS Autonomous Weather Station (Tracking System) - [Link]

2 Feb 2012

A mini Logic Analyzer wich has 4 inputs, it’s portable (55×65 mm), battery powered and at the moment can capture data upto 100kHz. Vassilis Serasidis writes:

This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1730 Infrared Receiver, on the Transmit and reveive pins of MAX-232 chip (RS-232), on Clock and Data pins of I2C data bus and many more electronic components. This circuit is so far limited upto 100 kHz digital signals but this will be changed with a future firmware update.

4-input mini Logic Analyzer - [Link]

29 Jan 2012

Moser from ReiBot has developed a simple project for using an Arduino along with an LM399 and several discrete components to measure inductance. He says: [via]

So you need to make or measure an inductor, but you don’t have an oscilloscope or signal generator? Measuring inductance with a handful of cheap common parts is certainly possible. I’ve verified this method is accurate with a scope from 80uH to 30,000uH, but it should work for inductors a bit smaller or much larger.

Easily measure inductance using Arduino - [Link]

29 Jan 2012

Charalampos Andrianakis writes:

I designed this version in the need of a thermometer for my room, built in a small pack and easy to control. The hardware is designed on a way so that the pcb can be wall mounted. At the top side of the device the PCB extents giving space for two keyhole type holes which are able to keep the device mounted on the wall. The LCD display plugs at the front side of the PCB, covering all the electronic components and giving a compact design view. The user can interact with the device using the left side switch button. The design includes a 6-pin header which gives connectivity for UART (RX,TX,GND) and for the external sensor DHT-11 (VCC,GND,DATA). Also there is an ISP-6 pin header which gives the option of on board programming. Finally there is an optional Bluetooth plug on the back side connected with AVRs UART for possible communication to other devices like mobile phones, home automation devices, pc’s or whatever you imagine.

The code is written in C and is well performed in a readable way so anybody can read and modify it. For the LCD driving i have used Peter Fleury’s library.

AVR Atmega8 and DHT-11 Thermometer V2.0 - [Link]

23 Jan 2012

author Roman Black:

Roman Black has described an easy to build Pic based high resolution capacitance meter on his web site. In need of a way to measure my junk box cap collection, I quickly saw the advantage of his design and built a copy.

When using a DMM cap tester it is soon apparent that they work well on the larger caps, which is not really that helpful as the large caps are usually well marked. Small caps, in the pf and nano range, are a different story, tiny cryptic markings, if at all, and inconsistent, non-repeatable readings on the DMM.

What a treat then to use Roman’s 0 to 50 MFD cap tester and be able to read down to several pf, with rock steady, repeatable results.

High Resolution Capacitor Meter - [Link]

22 Jan 2012

Alan (w2aew) has done a great little video about bandwidth factors in scopes. He writes: – [via]

I’m often asked by hams and hobbyists – I want to buy an oscilloscope, what bandwidth scope do I need? I usually answer – buy as much as you can afford, even if you are working on low frequency circuits. This video shows an example of why. Even simple audio circuits might have some hidden evils!

Analog & Digital Oscilloscope Bandwidth Considerations - [Link]





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