Mfos Noise Toaster

Mfos Noise Toaster
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MFOS noise toaster is a circuit that helps squeeze more entertainment out of a voltage battery. It comes with many components: a low-frequency oscillator, a voltage-controlled amplifier, and others. The project incorporates a normalization switch mechanism for making noises without the use of wires.

The kit also includes a PCB with Interfaces for connecting with other creative projects and a built-in One Watt Audio Amplification and Loudspeaker that works on a single battery pack for portability and good battery life. The features raise the demand for all users, and each wishes to have a toaster to improve the noise emission for entertainment purposes.

Luckily, the article shows common features of the MFOS noise toaster and some of its pros and cons. Also, there are some FAQs concerning the kit. Please read the article below to learn more about the MFOS noise toaster and see if the features suit your choice.

Components of the MFOS noise toaster

The major parts of the MFOS noise toaster include the following;

1. Voltage-controlled oscillator

A voltage-controlled oscillator is an essential part of the MFOS noise toaster that provides a broader range of bandwidth commonly known as ramp core design. The ramp core design controls the waves via different electronic methods.  Sometimes, the noise toaster also applies the wave that one can use as an inverting summer.

2. Voice controller filter

The type of element is essential in providing meaningful functionality to noise emission. For instance, it reduces the past type filter since it has two caps and a resistor for providing grounding feedback. The two filter capacitors are the C9 and the C10, which show the features of the filters together with their gain.

If you wish to regulate the bandwidth of the filter’s cut, it is advisable to use the voltage that is Q8 and the VCR mode. Regulate the filters by adjusting the R38 transistors, which function as a voltage-controlled ceramic capacitors.

3. Voltage-controlled amplifier

Voltage-controlled amplifier

It is essential in distorting the signal that flows through it one by one. Also, it is usually a single channel, 2N5457 N, that is applicable in voltage resistor mode to protect all other cables from electrical damage. To use the VCA, apply the voltage-controlled filter’s output and choose the output from its supply, which has a connection with the BN through a resistor commonly known as the load resistor R47. 

The resistance existing between the supply source and the drain flows down, and as a result, the signal lowers down, and the only switch you can use to bypass the voltage-controlled amplifier is an S5 switch and the source of the Q7. When creating the noise toaster, pay more attention to the drain and the source, including the switch.

4. Power supply

The kit has the main power supply which is a C23 capacitor that is capable of holding a charge that assists the battery when it is faulty or when it is not charging. Also, it supplements the battery when there is too much power being drawn from it, and there are two common grounding points present in the circuit, and they are; R23 and R22.

The two grounding points are usually from the voltage divider that provides the amount of voltage between the battery terminals and the battery itself. Such voltage is beneficial in providing a grounding reference in the noise toaster.  There are two capacitors present; C13 and C14. The two resistors are beneficial in ensuring the operation of the circuit is stable.

5. White noise generator

The white noise generator is usually available on the emitter-base breakdown of the transistor present. Its function is to produce noise for entertainment, and the common transistor is the Q5. You can also apply the Bp to the Q5 transistor through the current regulating the resistor. The Q5 transistor performs its function by amplifying the signal you use on the base and providing the amplified signal through the Q2.

After applying that in the first stage, repeat for the second phase by providing more gain. The setup leads to sound emission or emits a noise that is friendly and clear to the user. If your kit battery starts reducing, your noise emission will start reducing, and finally, there will be no generation. First, find the emitter-base and see why the noise is more than the breakdown voltage of the transistor, that is, Q5.

6. Low-frequency oscillator

The component determines the frequency via the C16. The bandwidth usually ranges from 2 Hz up to 246 Hz. The circuit usually needs constant charging and discharging via the amplifier’s output. The resistors are R48 and R49. If you want to give additional entertaining modulation shapes, consider modifying the square wave and emitting a more advanced square wave. In that case, you have to use the R56 resistor and the C19 capacitor.

7. Attack release envelope generator

Such implementation on the MFOS noise toaster is very straightforward but beneficial. If you implement the noise toaster manually, the advisable module is the S8 SPDT, where you configure it to manual. Also, you can apply the S10 to create a gate to the attack release envelope generator.

8. One-watt audio amplifier

The amplifier comes with an integrated design that makes it more useful in datasheet operations. If you want additional information on an internal circuit, consider reviewing the datasheet, or you can consider using search engines such as the Google engine, and chrome, among others.

When using the one-watt audio amplifier implementation, you position the output of the simple JFET VCA to the other terminal of the R66, which is applicable as a variable attenuator, and connect the other end to a power supply source such as a battery.

First, restrict the DC from getting to the input of your system using the C21 aluminum cap. As time goes by, consider using an advanced and other voltage-controlled amplifier output and vice versa. Also, there are two common resistors applicable in the process, and they are; R67 and R68 to increase the level of attenuation to the amplifier’s input. When using the resistors, be careful to avoid damaging the amplifier due to overdriving the system.

Pros of MFOS noise toasters

  • The building process is straightforward.
  • It has a broader range of voltage-controlled oscillators.
  • Comes with a cool low pass filter.
  • Light in weight hence portable.
  • It uses a low battery hence extending the charge for a long.
  • Aids in plant growth and calms goldfish.
  • The switching scheme is in a nice normalization.
  • Well-functioning VCA.
  • Generates some white noise.
  • Simple to operate.


  • Requires more knowledge of circuits before building them.
  • Supports only a one-watt audio amplifier.
  • Can attract alien visitations.

Frequently asked questions:

Can I change the option of the kit amplifier?

Yes, you have an option to change the MFOS noise toaster. The option is the amplifier gain boost option that changes from normal 20 up to 200 by placing more 10Uf electrolytes.


The MFOS is an essential kit, especially for those people who like clear noise when connecting to their amplifier, speaker, or even a piano. If you decide to create one on your own, please read the article above and ensure you fully understand how to implement all the components above. Some of the components are; a white noise generator, and a voltage-controlled amplifier, among others.

When using the kit, please take some precautions. Some of them are; to ensure you service the kit often to increase its lifespan. Also, avoid connecting to a huge or low voltage than recommended as you may damage the whole device. Lastly, it is advisable to seek help when necessary.

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