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Questions tagged [function-generator]

A function generator usually refers to a piece of test equipment that generates a variety of waveforms over a range of frequencies. A typical unit may generate sine, square and triangle waves at a frequency up to around 20MHz, they tend to be less often used at higher RF frequencies.

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Amplitude control in a signal generator

A am working on an FPGA based function generator and I am aiming for max frequency to be higher than 10 MHz, hopefully 30 MHz. I have implemented most of the functionality except amplitude control. ...
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27 views

DC biased sine generation using raspberry pi

I'm trying to make a sine wave generator using a Raspberry Pi. I need an sine wave(1Vpp) with user supplied frequency riding on a 4V DC bias. The SoX package seems useful to generate sine waves and ...
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54 views

Characterization of an Amplification/ADC circuit

I build a small amplification circuit in order to amplify the low voltage signals of my passive sensors (the sensors have a source impedance of about 50-200 Ohm and they output a low voltage signal in ...
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2answers
60 views

BJT Astable Multivibrator - What is the max. oscillation frequency?

What is the max. oscillation frequency of this Astable Multivibrator circuit? Is it directly related to transition frequency of the transistor? I plan on using it with BC547B transistor. The hardwired ...
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22 views

Effect of impedance mismatch on phase of the signal

The effect of impedance mismatch on voltage measurement is known but is it possible for impedance mismatch between a oscilloscope and function generator to cause a phase difference? In my setup I have ...
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1answer
50 views

LED output with Photodiode and Function Generator

Some of my student and I are designing a Physics experiment involving a high power LED, a square wave from function generator (50 ohm output impedance) and a digital oscilloscope (1 MOhm imput ...
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1answer
45 views

Differences in voltage measurement at the input of a circuit

I am trying to understand the difference I am seeing in voltage signals, that I am applying to my circuit's input. So the basic layout is shown in the diagram, I have a connection, A from my function ...
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39 views

Upgraded flipflop square wave generator - did I do good?

I've drawn up a simple multi-frequency square wave generator, based on a astable multivibrator circut, with frequency trimmed by the two ganged pots (both 100k) and the range set by a DPDT switch, ...
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3answers
65 views

Tektronix function generator THD

I am confused by the datasheet of the AFG3021C: https://www.tek.com/link-click-count?nid=75006&url=https%3A//download.tek.com/datasheet/AFG3000C-Arbitrary-Function-Generator-Datasheet-75W282817....
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2answers
140 views

What device can convert (EEG) voltage data to real voltage? [closed]

I seek a device that can be programmed to output physical voltages based on a set of datapoints. For example: ...
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1answer
126 views

i want to duplicate a signal generator output

I want to duplicate signal generator output to dual. since i want to use same signal to two different place. Is this possible without amplifying and inverting the signals. Let me share some circuit. ...
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1answer
108 views

Voltage Divider with low noise?

I'm working with a nano scale motion stage with high precision. To move the stage I supply Sinusoidal wave using (Agilent Keysight) function generator. This F-gen, goes as low as \$20mV_{pp}\$ in ...
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4answers
54 views

When reading the digital wave from a DAQ, should I be getting the same wave I'm generating to it?

I am using a DAQ device, which is said to be capable of 400kS/s maximum, and therefore 50kS/s per channel when using all 8 channels. This is listed in the manual of the 1608fs plus DAQ So I connected ...
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340 views

Using ICL8038 as a VCO

I wanted to use this function generator IC as a voltage controlled frequency output especially to obtain low frequency sine waves. But unlike many implementations, I wanted to control the frequency ...
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1answer
199 views

10MHz Sine Wave Generator

I have been looking for some time for a good design for a ~10MHz sine wave generator, with variable frequency from about 5-20MHz. The max required peak to peak amplitude is 10V. Many suggestions on ...
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4answers
390 views

Why can we hear the full range of square waves from 1 Hz-20 kHz, but not sine waves of the same frequencies?

I connected the output (50Ω) of a function generator to a 35 watt 5Ω speaker. When I sent square wave signals of 1 Hz-20 kHz to the speaker, my friends and I were able to hear them. But ...
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1answer
120 views

No output reading from Op Amp on Oscilloscope

So I have an inverting op amp (gain = -1) wired up, and it works with a DC signal. I checked the DC signal by measuring the input and output voltages with a multimeter which were 5V and -5V, ...
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1answer
50 views

How to use a signal from one function generator to gate another signal from another function generator?

I have 2 function generators with me and each is outputting its own signal. The first one is a 100kHz square signal and the second one is a 10MHz sine signal. What I want to do is use the first signal ...
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29 views

SCPI - program signal generator to stack existing signals

I have a Keysight 33500B signal generator and I would like to remotely program arbitrary (ARB) waveforms that consist of existing signals in the device's library, ...
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2answers
202 views

Why do I get a triangle wave in this Schmitt trigger oscillator?

I'm trying to design a function generator that can generate square, triangle and sine waves, with frequency varying between 100Hz and 100kHz. The circuit in the blue box is supposed to be a schmitt ...
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66 views

Output impedance function generator, limiting the current

I've the following schematic: simulate this circuit – Schematic created using CircuitLab Now the R of 50 ohm does limit the current that be supplied to the load. Is there a way to be ...
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4answers
352 views

High power (but low frequency) arbitrary waveform generator

At least a few times I wished I had a "soundcard on steroids", so that I can replicate a specific waveform I'm getting from a generator, transformer or other devices I'm dealing with (e.g., see this ...
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3answers
205 views

What DIY Function Generator is Suitable to drive a Pasco WA-9857 String Vibrator?

Preface... total amateur. I picked up 8 Pasco WA-9857 String Vibrators off of eBay for an art project. I need some way of driving them individually.... cheaply. So I bought a $12 XR2206 Function ...
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2answers
163 views

How can I increase the AC voltage from a function generator?

I'm doing an assignment where the objective is building a function generator. We used AD9850 to generate a wave but its output voltage is below the requirement. (We require 10 Vpp, but mine is about 1 ...
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290 views

Square wave generator J1772

For an electric car charger I need to design a square wave of ±12V at 1kHz [SAE J1772]. I would like to make this one with a adjustable duty cycle so that the charging current can be adjusted. I ...
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2k views

Sawtooth Wave Generator Using Op Amps

So I'm trying to design a sawtooth wave generator that goes from 2.5V to 3.25V. I'm using this design: I'm getting a voltage range from around -4V to 4V. Is there any way for me to get 2.5 to 3.25 by ...
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1answer
48 views

Approximating dynamics in continuous-time with discrete-time

I'm not sure if this is the best place to ask this question, so please direct me to the appropriate community if this question seems out of place here. I am working on a project in which I'm trying ...
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2answers
256 views

Function generator output level drifting

The output level on my BK Precision 4017A function generator is drifting. For example, if I set the output level to 10.0V on a 2kHz sine wave, driving a variety of simple half-wave rectifier and ...
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1answer
1k views

Sine Wave Generator Circuit - Bipolar

I have this sine wave generating circuit working. It is based on an application note from TI (http://www.ti.com/lit/wp/snoa839/snoa839.pdf). we are driving an inductive sensor with a 2KHz sine wave, ...
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1answer
347 views

How to invert a digital signal from operational amplifier [closed]

I have built myself a simple square wave generator with an operational amplifier and it works grea, but I want a second one with an inverted output. Are there high voltage Logic OR gates ?
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1answer
177 views

What is the purpose of this RF sweep oscillator circuit section

I'm on a (very) long and arduous journey to build a RF sweep generator for tuned circuit filters. After much experimentation with free running LC oscillators, I conclude that for this application (...
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1answer
316 views

Locked-Sync Sine Generator Covers Three Decades with Low Distortion

I am working on my first project in analog/board design, and although I know a decent amount of theory in electronics, I am lacking in practical experience. I need an exact sine wave generator, and ...
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1answer
70 views

Avalanche Breakdown Noise as digital input

I am trying to develop a true random number generator using reverse biased transistors avalance breakdown noise as a input for pic microcontroller. How can i turn the noise in to a digital input ? Is ...
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2answers
186 views

True Random Number Generator by using avalanche breakdown

I am trying to build a TRNG using avalanche breakdown for randomness. I am developing a circuit as looks like this.(https://web.jfet.org/images/rng-circuit.gif) Before I complete the circuit i ...
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1answer
650 views

Float Function generator

Why are the Outputs of many function generators earth grounded? As far as I understand grounding the generator or Parts like the chassis can reduce shock hazards if something fails within the ...
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2answers
104 views

What switch would replace a series of 6 pins linked by jumpers?

I've bought a small electronics kit - a function generator which produces a 1kHz signal in various waveshapes - square, sine, triangle and integrator. It's a basic kit on a single PCB (555 timer based)...
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1answer
89 views

Why can't I connect 2 signal generators in series? [closed]

I am about doing a laboratory about signal generators, and there is a question which 50% the people I talk say "Yes", and other 50% say "No". Is it possible to connect 2 signal generators? If you'...
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1answer
101 views

Function Generator - Signal without Neg or Gnd reference

I have a new PC based function generator (very cheap), and an old BK Precision function generator. The old BK Precision can output a signal without the ground or negative reference lead from the BNC ...
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1k views

Why do TTL pulse generators generate an asymmetrical square wave (unlike CMOS)?

I've read that the asymmetrical (about 1/3 mark-to-space) output waveform is due to input gate characteristics of a TTL inverter, but I want to know more about which characteristics of the TTL input ...
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4answers
2k views

What is causing this Op-Amp Distortion

I am new to analog electronics and I am still learning about op amps. I am driving an 8ohm 15 watt speaker with just an op amp and my phone. What I do not understand is that I have a dual supply, 10V ...
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1answer
217 views

Flashing “GATE” on the Bel Merit FG-150 function generator

What does the flashing in the bottom left corner of the display "GATE" means on this generator? I could not find a manual high and low. I found a discussion on GATE function here but it seems to ...
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2answers
313 views

Using amplifier to drive an electromagnet

my group-mate and I are currently trying to create a kind of a simple speaker which could vibrate up to 1 kHz. The speaker we designed was simply made up of small solenoid and a cylindrical magnet, we ...
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2answers
94 views

Function generator for OFDM signal

I have been simulating analog circuits where the input resembles an OFDM signal, but with lower frequencies. Right now I am generating the input signal with MATLAB. I now want to have a physical ...
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2answers
828 views

Amplitude drop as frequency increases on function generator

As I increase the frequency on my function generator, the amplitude of the transmitted wave decreases. Is this to be expected? Or is there an issue with my function generator?
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45 views

Input across RC circuit is not showing a square wave though the input is a square wave [duplicate]

I wanted to observe the transient response of the capacitor so applied a square wave of 205mHz from a function generator as that would allow complete charging and discharging for the capacitor in the ...
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2answers
304 views

RC circuit charging and discharging by square wave not giving a square wave across input on oscilloscope [closed]

question shifted to Input across RC circuit is not showing a square wave though the input is a square wave as it was unclear
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116 views

Programmable GHz signals

I would like to generate custom waves in the gigahertz range. With beginner FPGAs like the DE0-Nano or microcontrollers like the Arduino, I can only generate waves up to the kilohertz range. What ...
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1answer
967 views

Circuit to increase current of arbitrary waveform generator

I am trying to create a setup for some Physics experiments - so my background is Physics, not Electrical Engineer that can do circuit design. But I can put a circuit together. I need to amplify the ...
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2answers
451 views

Is there a way to add a tracking generator to a spectrum analyzer?

As the question suggest, is there a way to add an external tracking generator to a spectrum analyzer which doesnt have a tracking generator? Specifically speaking the HP 8564e spectrum analyzer ...
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0answers
99 views

Setting up a sonar transducer, the TC-3027 to measure distance

I will first attach some pictures of the sonar, its datasheet, and then a sample setup from another project. Datasheet My goal is to use one sensor, to send and receive signals. I have an ...