Attachment for electric guitar. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Musician

 Comments on the article

The author of the article, a musician playing in a rock band, studied a large number of domestic and imported guitar consoles with "Distortion" and "Overdrive" modes and came to the conclusion that almost all of them have more or less pronounced sound flaws - an unpleasant, harsh timbre ; increased levels of noise and background, etc. As a result of numerous experiments, he managed to create an optimal, in his opinion, guitar prefix, free from these shortcomings.

Many prefixes for electric guitars have too sharp, "poisonous" sound. These, for example, include prefixes of domestic production of the Gamma series, as well as foreign ones - from DOD and BOSS. To a lesser extent - "Crock" of the "Promal" plant. The only domestic set-top box that has a more or less balanced sound spectrum is the Lel DD from the CAM plant. It gives a rich overtones, juicy timbre, but, unfortunately, only in the "Drive" mode. When switching to the "Drive-distortion" mode, a very unpleasant "crunchy" sound appeared.

The author used with some changes the circuitry of the "Lel DD" prefix, excluding from it the node that creates the "distortion" effect. The signal is fed to the node effect "Drive"-prefix. Directly behind it, a device is included, which is described in the article by S. Godin and A. Kazakov "Prefixes for electric musical instruments" ("To help the radio amateur", issue 101).

Below is a complete description of the modified prefix "Lel DD", so everyone can repeat it.

(click to enlarge)

Technical specifications

The prefix contains an electronic switch and a spectrum conversion unit. The switch is used from the prefix "Lel DD". It contains a trigger DD1.1 and field-effect transistors VT3, VT4 and VT7 operating in switching mode (see diagram). Suppose that when the power is turned on, a low-level voltage is set at the inverse trigger output, and a high-level voltage is set at the direct output, which closes transistors VT3 and VT7, turning off the input and output of the spectrum conversion unit. The low-level voltage opens the transistor VT4 and closes the transistor VT5. HL1 LED is off. The signal passes from the input of the set-top box to the output, bypassing the spectrum converter.

A short press on the SB1 button switches the trigger: now the voltage is set to a high level on the inverted output, and low on the direct output. Transistor VT4 is closed, and VT5 is open. The LED indicates the operation of the set-top box in the "Effect" mode. Transistors VT3 and VT7 open and connect, respectively, the input and output of the set-top box to the spectrum converter. When the button is pressed again, the switch returns to its original state.

The second part of the JK flip-flop - DD1.2 - is not used. Its inputs (pins 9-12) are connected together and connected to the common wire of the set-top box.

In the "Effect" mode, the signal is fed to a logarithmic limiting amplifier (operational amplifier DA1.1), which performs a preliminary transformation. Further, from the output of the buffer stage on a field-effect transistor VT1, the signal is fed to a tunable filter (operational amplifier DA1.2). Trimmer resistors regulate: R13 - timbre; R16 - frequency; R19 - gain at resonant frequency. From the filter output through the "level 1" regulator (tuner resistor R21), the signal is fed to the input of the second, main converter, made on the operational amplifier DA2.1. The degree of signal limitation is regulated by a variable resistor R28 "Drive". Then the signal goes to the second filter (operational amplifier DA2.2). The resistor R31 regulates its quality factor (in the prefix "Crock metall" this regulator is designated as "presence"). Variable resistor R35 "Frequency" regulate the degree of saturation of the signal with higher harmonics.

From the output of the second filter, the converted signal is fed to the output of the set-top box.

Unlike the operational amplifiers KR140UD608 and K140UD6 used in the original devices, the author used K157UD3, which has a low noise level. Replacement with K157UD2 is undesirable for the same reason. In addition to what is indicated in the diagram, you can use operational amplifiers of the K544 and K574 series, as well as similar imported ones. Transistors can be used in the specified series with any letter index. In the author's version, all transistors are in metal cases to reduce the level of interference. The VT5 transistor can be in a plastic case or any of the KT315, KT342 series.

In timbre-forming circuits, the installation of ceramic capacitors is undesirable due to their tendency to microphone effect. Capacitors K73-16 and K73-17 are recommended.

Trimmer resistors R6, R13, R16, R19, R21 and R31 are installed on the board inside the set-top box. Handles of variable resistors R28, R35 and R36 are brought out for operational control of the set-top box. Connectors X1 and X4 - "Jack".

The prefix is ​​powered by a Korund battery or an external source with a voltage of 9 ... 12 V.

The adjustment begins with the preliminary installation of the trimmer and variable resistor engines: R6 - to the leftmost position according to the diagram (corresponds to the minimum signal distortion); R13 - extreme top; R16 - slightly above the extreme bottom; R19 - extreme lower; R21 - about the middle; R28 - above the middle; R31 - extreme left; R35 - in the middle; R36 - about 3/4 of the maximum volume. Further tuning is done by ear until the desired timbre is obtained.

The prefix allows you to get a juicy, rich overtones sound. Its use in conjunction with additional "distorters" of the signal is impractical.

Sound examination was carried out with guitars "Fender stratocaster", "Gybson", "Ibanez", "Samick", "Lead Star", as well as several high-quality copies of amateur production. As a result of blind testing, in which the Gybson electric guitar, the described prefix, DOD prefixes - "Trash master", "Super overdrive", "Death metal", "Metal maniac" and the guitar complex "Park" were used, the preference was unanimous given to the prefix proposed by the author.

To reduce noise and background levels, I recommend using a set-top box with grounded equipment and power supplies with a high stabilization factor. It can be used in conjunction with "Compression sustainer" devices.

Author: V.Efimov

See other articles Section Musician.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive soulution 511 stereo power amplifier 02.05.2016 soulution introduced the Model 511 stereo power amplifier. The product is based on four 600VA switching power supplies with improved filtering and six linear, high-speed, low-noise voltage regulators, with a total capacity of storage capacitors of 500000 uF. Current amplification is carried out on three stages, demonstrating increased linearity, the current can reach 60 A. The cutoff frequency is 80 MHz. The output power per channel when operating at a load of 8, 4 and 2 ohms reaches 150, 300 and 600 watts, respectively, and in mono mode it is already 600, 1200 and 2400 watts. The amplifier is connected to the output terminals with thick copper bars. Power is supplied separately to the amplifying part and auxiliary units, they are isolated from each other by means of optical isolation. The signal-to-noise ratio does not fall below 101 dB, the level of harmonic distortion does not exceed 0,004% in stereo mode, in mono mode it drops to 0,0004%. The soulution 511 amplifier has one input and output balanced XLR connector and a pair of terminals for acoustics; there is an RJ-45 connector for communication with other soulution components. Those who wish will be able to purchase a novelty in October at a price of about 22200 euros.

Other interesting news:

▪ Mathematicians have developed the perfect espresso coffee

▪ Chainsaw with microprocessor

▪ World's most complex insect brain map ever created

▪ Rugged smartphone Oukitel WP21

▪ New comprehensive security system to combat cyber threats

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Electronic directories. Article selection

▪ article Bead Game. Popular expression

▪ article Who Invented Comics? Detailed answer

▪ article Callistemon. Legends, cultivation, methods of application

▪ article Low voltage metal detector. Encyclopedia of radio electronics and electrical engineering

▪ article Snake in a basket. Focus Secret

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024