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The block diagram of a typical voltage controlled oscillator is shown below. It is possible to recreate this in Multisim in a top level schematic using ideal components to see if it gives you the desired results with om566 shown external parts as well.

However, there’s not really a great deal of benefit to using a dual supply, as it doesn’t simplify the circuit in any way. Is your intent just simulation or do you want to lay out a PCB?

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. You can also change the resistors around the input stage or the Schmitt trigger.

LM 데이터시트(PDF) – National Semiconductor (TI)

There are a few PLLs phase locked loop ICs that are still available, but they aren’t especially easy to use. C1 is selected to give response down to the lowest frequency of interest, and is less than 1.


Triangle and square wave outputs are obtained datasjeet pins 4 and 3 respectively. Changing the Schmitt trigger resistors will change datashewt output level of the triangle wave, which will affect the distortion when the diode clipper is used to obtain a sinewave.

You will need to experiment a little to get the frequency you need. Message 2 of 7. For this, waveform purity isn’t a major concern, but you do need a constant amplitude regardless of frequency.

LM566 Datasheet

Capacitor C2 is used to lm5566 the parasitic oscillations during VCO switching. Other constraints are the values of Rt and Ct those determine the output frequency range.

It requires a single supply, and it must be regulated if you want to synthesise a sinewave from the triangle wave output. Despite appearances, the input will not be at zero volts when the pot is centred.

These alternative versions are not covered here. You’d probably be right, but some things are just too interesting to ignore, and this is one of them. Resistor R3 is used to provide the control voltage Vc. You should provide a schematic of your test setup. This isn’t needed for the LM, but is required for many dztasheet opamps that are a great deal datasneet.

LM Datasheet pdf – LMC Voltage Controlled Oscillator – National Semiconductor

The VCO can be operated from a dual supply, and that only entails a few minor changes. The output frequency can be also programmed using a set of external resistor and capacitor. The voltage will be around The control voltage input needs to be biased to some voltage that gives you the base frequency you need. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


The reason for using a circuit like those shown below is – first and foremost – to be able to get a passable sinewave output. Further, your statement is incorrect- the control voltage must be less than a maximum.

The next circuit will do just that, but it’s not a precision circuit. VCOs are used for tone generators, 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.

Message 1 of 7.

Thus by varying the voltage across the varicap diode in the tank circuit, the output frequency of the VCO can be varied. The datasheet shows a pair of fixed resistors, but I’ve shown a pot that lets you set the base frequency. The output frequency of the VCO can be obtained using the following equation:

Last modified: January 4, 2020