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Few provide a triangle wave output though, and with many the output is a pulse waveform, rather than a squarewave equal on and off times. If the exact ratios are not maintained the waveform will become sawtooth, with different positive and negative going times. If you only need a low frequency VCO, this is the easiest way to build one.

It’s actually a clever design, and relies on U1A to integrate the source modulating voltage to produce a positive-going linear ramp.

LM datasheet & applicatoin notes – Datasheet Archive

LM Frequency deviation problem Ask Question. If these aren’t high on your list of features then much simpler VCOs are easily constructed using a timer or similar. This isn’t needed for the LM, but is required for many other opamps that are a great deal faster.

In most cases, this isn’t a serious limitation, but expecting low distortion isn’t an option – the best you can expect is around 1. You’ll find datzsheet examples of this circuit on the Net, but since you will be unable to get a reliable source of the ICs it’s a moot point.

The input can be supplied via an opamp datssheet if desired, but for most applications it’s not necessary. The author Rod Elliott grants the reader the right to use this information for personal use only, and further allows that one 1 copy may be made for reference while constructing the project. C1 om566 selected to give response down to the lowest frequency of interest, and is less than 1.


It does allow the modulating signal to be direct coupled, but that doesn’t necessarily provide any advantages. Sensitivity is halved because the effective supply voltage has been doubled compared to the single supply version shown in Figure 2.

Voltage Controlled Oscillator (VCO)

This will change slightly depending on the load and the ICs internal temperature. VCO Voltage controlled oscillator Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. He asked for LM not LM In such oscillators, an LC tank datsaheet is used for producing oscillations.

Message 6 of 7. Is your intent just simulation or do you want to lay out a PCB? The datasheet shows a pair of fixed resistors, but I’ve shown a pot that lets you set the base frequency. It’s important to connect the input stage including the transistor as shown.

Use the values shown to get a general idea, and if the capacitance is doubled then frequency is halved and vice versa of course. The input can be driven to greater than 12V, but with somewhat reduced linearity. R6 and R7 set the threshold, which is also affected by the output voltage from U1B. There are a few PLLs phase locked loop ICs that are still available, but they aren’t especially easy to use.

If the modulation input is referred to ground e. An active element like a transistor is used for amplifying the output of the Datasgeet tank circuit, compensating the energy lost in the tank circuit and for establishing the necessary feedback conditions.

You can also use a function generator IC. This isn’t something I intend to include, and if that’s what you need you’ll have to look at designs specifically intended for use with synthesisers. If you would like to try method 1 and see if you can get it to function at the top level in a Multisim dataxheet, I would be able to show you how to convert ml566 into a subckt. VCOs are used for tone datashfet, frequency modulators, clock generators, function generators, music synthesisers and frequency shift keying FSK, a radio transmission system where digital information is transmitted via discrete frequency changes of a carrier wave.


Can you recommend a circuit or teach me how to do this? However, the frequency also depends on the threshold voltages for the Schmitt trigger U1B. The output voltage may be stuck at zero or around datashset. This depends on what level of accuracy you need. You may also like: The datasheet shows a formula for frequency, and with the values given in Figure 1 it works out to be 1kHz if the ‘Set Base Frequency’ pot is set for 6V.

These alternative versions are not covered here. The only thing you dataasheet do is to check all wiring very carefully, secure in the knowledge that if everything is wired exactly as shown, it will work. The 2SC appears to be an older component and may be hard to come by sim and layoutbut there are several medium power transistor replacements that might work and there are several available in the Multisim database.

One application that can be very useful is to use a VCO as a sweep generator for testing loudspeakers, crossover networks, equalisers, etc.

(PDF) LM566 Datasheet download

Despite appearances, the input will not be at zero volts when the pot is centred. Capacitor C2 is used to prevent the parasitic oscillations during VCO datasueet.

Ok sorry about that, I must have used “LM5” in the Multisim quick search which brought up the timers and I didn’t see the discrepency.