Tag Archives: Function Generator

MAX038 Function generator

FR9WEPTIKLFROJ1.MEDIUM

Milen @ instructables.com has designed a Function Generator based on the popular MAX038 and is controlled by ATMega328PU. Signal characteristics are displayed on a LCD screen.

The digital features of the function generator were performed by one Atmega328 chip. Its functions are the following:
controls the frequency range selection
controls the signal type (sine, rectangular, triangular, sawtooth)
measures the amplitude of the signal
measures the DC offset
measures the frequency of the signal
measures the THD of the sine signal in the audio range (this still have to be implemented)
displays all this information on a character 16×2 LCD display.

MAX038 Function generator – [Link]

Easily measure diode capacitance and reverse recovery

1N4002 zero Vf bias ll 120pF

Glen Chenier @ edn.com wanted to find out the characteristics of an unknown diode to be able to replace it with an equivalent one so he decided to make some measurements using his test equipment. In this article he show us how to measure the junction capacitance, Cj, and reverse recovery time Trr of a diode using a function generator and a 100Mhz oscilloscope.

Easily measure diode capacitance and reverse recovery – [Link]

nScope | a lab for every laptop

nscope

nScope is a USB-powered oscilloscope, function generator, and power supply that turns any laptop into an electronics workbench.

nScope is a usb-powered device that plugs into an electronics prototyping breadboard. nScope’s main function is an oscilloscope. Much like a multimeter, an oscilloscope measures voltages in a circuit. But unlike a multimeter, it stores voltages over time and displays them in a graph. This makes nScope much more useful for observing sensor signals and dynamic circuits. nScope’s software interface maximizes the graph space, and provides controls for setting the measurement speed and range.

nScope | a lab for every laptop – [Link]

Tektronix Entry-level Function Generator

TekFunction

by elektor.com:

Tektronix Inc., has introduced a new entry-level Arbitrary/Function Generator. The AFG1022 is targeted at educational institutions and supports a wide range of use cases and course subjects. The AFG1022 also integrates with the new TekSmartLab wireless lab instrument management solution.

Michael Ewald, General Manager, Bench Products, Tektronix stated that “Tektronix strongly believes that a rich hands-on experience dramatically improves education outcomes, that’s why we are working hard to meet the needs of colleges and universities including good price-performance on instrumentation, integrated courseware and ease of administration.”
Key performance specifications include dual-channel, 25 MHz bandwidth with 1 mVpp to 10 Vpp output, 14-bit vertical resolution and 1 µHz frequency resolution. It provides a 125 MS/s sample rate along with 64 MB of built-in non-volatile memory and USB memory expansion for user-defined waveforms.

On the functionality side, the instrument offers 50 built-in standard functions and arbitrary waveforms with continuous, modulation, sweep and burst modes to cover almost all the test requirements found in basic education labs. A built-in 200 MHz counter with 6-digit resolution offers an easy and precise way of performing frequency, period, pulse width, and duty cycle measurements.

Tektronix Entry-level Function Generator – [Link]

Teardown and Repair of an Agilent 33250A Function and Arbitrary Waveform Generator

by  TheSignalPathBlog @ youtube.com:

In this episode Shahriar repairs an Agilent 33250A function and arbitrary waveform generator which does not power on. The unit is equipped with a soft power switch which might be responsible for the fault. After a brief look at the unit’s constructions, the fault is traced to a few possible locations.

The schematic of the soft power circuitry is presented and the internal switching power supply is closely examined. After the fault is located, the repair is presented. The block diagram and operation of a current mode DC-DC switching IC is also presented.

Teardown and Repair of an Agilent 33250A Function and Arbitrary Waveform Generator [Link]

Farnell element14 and the BitScope

BitScpMicro

by elektor.com:

Farnell element14 have announced that they will be stocking the BitScope BS10 measurement device which combines a 2-channel USB oscilloscope, spectrum analyzer, 8-channel logic analyzer and function generator. You can use it with a PC running Windows or Linux, an Apple Mac or even a Raspberry Pi. Sampling rate is up to 40Msample/s giving it an analog bandwidth of 20MHz. The software supports frame rates beyond 20Hz and includes a ‘digital phosphor’ display mode. Resolution is up to 12bits.

Farnell element14 and the BitScope – [Link]

Tiny DDS – Open source DDS generator

DDS

by Philippe Duboisset:

This project is an open source (hardware & software) DDS generator, based on: smart TFT module, AD9834, LM7171 fast amplifier. The homemade function generator is a quite common project on the internet. We can find different ways to do it:

– The quick & dirty way based on a DDS module bought on eBay
– The analog version based on a MAX038 / XR2206
– The “clean” way based on a FPGA and a fast DAC (e.g. http://www.circuitben.net/node/14)
– The software way (e.g. Arduino + R/2R DAC)

From my side, I wanted a small one which could fits my needs without being too expensive. According to me, such generator should at least:

– Be easy to use
– Output a signal from 1Vpp to 10Vpp (+/-5V), from 0 to 1MHz
– Have a low profile
– Without electric hazard (shall work on a 12V DC)

Tiny DDS – Open source DDS generator – [Link]

EEVblog #652 – Oscilloscope & Function Generator Measurement Trap

Dave explains a big trap in high frequency measurement with your oscilloscope. Based on a viewer request, Dave demonstrates how to incorrectly and then correctly measure the signal output level over frequency of your function generator using your oscilloscope. Some whiteboard transmission line theory is thrown in as well.

EEVblog #652 – Oscilloscope & Function Generator Measurement Trap – [Link]

Bakerboard: The Educational Breadboard with More

An all-in-one breadboard with Oscilloscope, Spectral Display, Function Generator, and Power Supply.

We are excited to bring a low-cost audio range electronics development board to classrooms, labs, small businesses, and techno-geeks everywhere. This idea has been bouncing around in our family for many years and now the technology has caught up to make it a reality at a price that schools and individuals can afford. We have paired a traditional prototype board (or breadboard) with an electronics suite so that the experimenter does not have to purchase the expensive electronics test equipment needed during development. It is everything we wish we had when we were learning about circuits on a breadboard.

Bakerboard: The Educational Breadboard with More – [Link]