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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accuracy of signal generator is in dB

The accuracy of the signal generator is given ±(2mV + 0.4dB). Does 0.4dB mean error is 10^(0.4/20) of Input amplitude, which will be around 5%?
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AC and DC voltage are constant even though the frequency changes

In the circuit below, why does the AC voltage remain constant even though the frequency increases?
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LM348 replacable by LM358

I want to give SMD soldering a try and therefore I was looking for some useful circuit (no LED-blink-crap) I could build more or less easily. So I found a nice DIY function generator here. It uses ...
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189 views

What is output amplitude of Direct Digital Sythesizers as AD9850?

By looking at AD9850 DDS or other similar parts made by Analog Devices Company it is obvious that the output signal amplitude changes by frequency. This can be shown as x= pi* fout / fClock and ...
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How to amplify a signal to trigger a function generator?

I have two digital signals, I perform a AND operation on these two signal with an AND gate (TI SN74LS08N), and want to use the output signal to trigger a function generator which will generate another ...
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130 views

Need help setting up sweep function for signal generator

I recently bought a signal generator from Amazon. The model I got was the UDB1205s but I believe my question applies to any of the manufacturer's signal generator in the UDB120x series. A similar ...
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550 views

How to apply the Barkhausen criterion in order to know if a system will oscillate?

How to analyze or apply the Barkhausen criterion for oscillation of the astable multivibrator below? The criterion talks about the magnitude of the products in a loop must be equal to 1 (ideally) ...
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How to Identify a Power Receptacle

The Wavetek 144 HF frequency generator has an unusual power receptacle that I cannot identify. The link references the manual, which does not name the part. I'm not sure it isn't proprietary. Here is ...
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217 views

Amplitude modulator for a sine wave generator

I have a home made, mostly using the design in a magazine article, radio frequency signal generator, and I would like to be able to modulate (AM) the sine wave output, which is up to 8 MHz, with an ...
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259 views

Why did aliasing occur at a frequency before the Nyquist cutoff?

I sampled frequencies of 400, 500, and 600 Hz at a sampling frequency of 1 kHz. My oscilloscope showed aliasing at 400 Hz, nothing at 500Hz, and then a lot of aliasing at I saw some aliasing ...
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Design a simple circuit to generate variable +5V to -5V signals

I want to design a simple circuit that takes 12V from a battery and generates two signals each of range -5V to +5V. These signals are input to a 2-Channel ADC. I want to be able to change the voltage ...
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620 views

Power Amplifier for Signal Generator

I am trying to find the operate power amplifier to solve my power needs, I basically have a Function Generator -> Power Amplifier -> Helmholtz Coil Now I am trying to figure out if I get the ...
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628 views

What kind of cable does a function generator use?

I picked up an Agilent 33120A function generator used (yay!) and I need to buy the cable that attaches the output to the circuit. Problem is, I'm not sure what kind of cable it is. So, I guess I ...
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353 views

Impedance for Helmholtz Coil Connected to Audio Amplifier

I am trying to design a Helmholtz coil, that will have an impedance of about 2 ohms (the reason for this being that I am going to hook it up to a audio power amplifier, so to get the same wattage ...
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250 views

How to divide signal level from function generator

I looked for this answer but was unsuccessful so I want to ask the experts here. I have configured an op amp in non-inverting mode (the first in a chain of 3 stages). It is for amplifying extremely ...
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1k views

Error caused by Scope or Function Generator?

This question may not be valid, please excuse my ignorance. I am having difficulty measuring a decent square wave at 500kHZ. The image below shows a 4 volt CMOS output with a frequency of 500kHz ...
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877 views

How to control a speaker

We are trying to produce a sound wave with speaker. We also need to be able to control the frequency (we don't have specific numbers, about 50-500Hz). As far as we are concerned we are looking for a ...
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2k views

Oscilloscope/Function Generator with GnuRadio (using very cheap hardware)

I was just getting started with RF signal processing, and I was very interested in being able to make an oscilloscope and function generator work in real time with python. Essentially, I would like ...
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Measuring a soundcard output voltage

I have been experimenting with a Soundcard Oscilloscope and I am having some problems understanding what's going on! I have attached a screenshot of my digital scope setup. My hardware setup is ...
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Simple function generator using microcontroller

Is it possible to make a function generator with a microcontroller (PIC18F4550 OR PICAXE20X2)? I am thinking that for generating square waves it can be enough to make a pin output high and low on ...
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Analog function generator ICs?

Does anyone know of any old-school function generator ICs (similar to the ICL8038 or XR2206) that are still on the market? (i.e. not obsolete / NFFD - I'm not interested in scouring the globe for old ...
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3answers
936 views

Can I use a subwoofer as a linear actuator?

I need an actuator with a few mm of travel and it has to be very responsive to a very low frequency (DC-10Hz) sine wave generated by a function generator. I'm thinking of getting a cheap subwoofer ...
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Can you use Oscilloscope probes for a Function Generator?

I just bought a cheap function generator and have no test leads for it. I do have 2 pairs of oscilloscope probes with a 1X-10X switch on them. I am curious to know if I will get the same results with ...
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Calculate Current out of Function Generator

I couldn't find an equation for this on Google/Wikipedia, but does the frequency of a function generator (we'll say that it's a sine wave) impact the current output. Example, if I had a 5 volt source ...