# 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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### Internal resistance of Function Generator

I'm using a function generator that has a 50ohm internal resistance. Does this affect any circuit that I may connect it to and if so, how would it affect the results?
622 views

### Current flow through resistor in as current

While I was working in an AC current lab, I used a very simple circuit. 1 resistor and a wave generator. The voltage was about 3V (RMS) and the resistance 1.173 kohm. According to Ohm's law i.e. V=IR ...
16k views

### Should the output impedance of a function generator be high or low?

As we know, $R_{load}$ should be greater than $R_s$ on a function generator to avoid loading effect. Does it mean that the output impedance of the function generator should be lower?
2k views

### 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?
2k views

### 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 ...
1k 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 ...
927 views

### 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 ...
411 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 ...
1k 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) The ...
269 views

### 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 ...
605 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 ...
403 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 ...
1k views

### 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 ...
5k 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 ...
617 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 ...
744 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 ...
7k 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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### 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 ...
6k 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 ...
10k views

### 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 simple....
11k views

### 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 ...
7k views

### Analog function generator ICs? [closed]

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 ...
3k 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 10 Hz) sine wave generated by a function generator. I'm thinking of getting a cheap subwoofer ...