Con la ganancia al mximo, revela su verdadero espritu de distorsin. The shopping list opposite details the electronic components you will need to complete this modification. From now on, all the models are commonly called post '94. Use a capacitor tester if possible to get a close value. It buffers interfaces the previous Transistor Booster stage with the second half of the op-amp that will do all the magic. PPD: JAVIER desde Argentina hizo el mod con algunos cambios, us 47nF en C12 y 15K en R15, consiguiendo un resultado parecido. The high-pass filter created by C8 and R13 (and part of the VR1 pot depending on its position) will remove freqs below 72Hz (or lower depending on the VR1 position), As mentioned above, the diodes D4 and D5 will clip when the amplified signal goes over/below the forward voltage (V, The minimum gain is 0dB and can go up to 26.5dB depending on the position of the, The image below is only applicable to the case where the signal is so small (below clipping) that the diodes don't conduct, where the. var prefix = 'ma' + 'il' + 'to'; You need JavaScript enabled to view it. This makes the tone control seem much less severe, only brightening or darkening the sound to suit whatever guitar you happen to be using. The cut-off points of both filters are calculated so that their interweaving effect create a frequency scoop/notch. Es naranja y se llama distortion, as que en este caso es fcil de clasificar. but thats where I am at. La seccin de tono est basada en el control de tono del Big Muff. Vf es lo que provoca el clipping, y cuanto ms alto es Vf, ms alta puede ser la seal antes de que empiece a limitar. 6.3 The effect of the C10 Capacitor.7. The Boss DS-1 has been around since 1978 and remains to this day one of the top selling guitar pedals ever. Also, C5 & R10 reduce harmonics below 23Hz at the limit of the audio spectrum that will help either way to reduce oscillation. into 5 big blocks: Input Stage, Transistor Booster, Op-Amp Gain Stage, Tone Control, Output Buffer and Power Supply. Read the last page of the M5223A datasheet for more information. With gain at max level, it reveals it true distortion spirit. Made in Japan, with a distinguishable silver screw. This distortion stage is followed by a passive tone filter and level control. This gain will create a clipping that looking at the image below is asymmetric (cycles have a slightly different duration) and has a soft knee or soft clipping: The response of the Transistor Booster stage has an attenuation of the low frequencies because of the 2 high pass filters discussed above, so the freqs below 33Hz are attenuated (6dB/oct) and reaching the bottom of the graph at 3.3Hz the signal has a -12dB/oct roll-off. It is passive and tends to mid scoop the tone. Mod done, very happy with the result. In R9, D5 & R16 like your mod, but in C12 I put 47nF, C11 & R15 dont change, and I change R15 into 15kohms. The first part of this stage are 2 consecutive high pass filters: The basic idea behind this filters is to remove the excess of bass before the (next) distortion stage, a guitar signal with too much bass harmonics could make the distortion slow, dumped or muddy. The input capacitor C13 and R20 create a high pass filter with fc=3.4Hz (fc=1/2piRC), the idea is just to remove the DC levels so the transistor can be correctly biased. Both the emitter feedback and the lower collector current decrease Q2's voltage gain, which lessens the effect of the negative feedback through R7 and C4. Put a compressor before and an equalizer that boosts the 100Hz frequency after it, and youll get the real sound of rock and roll. El soft clipping limita la seal ms gradualmente aportando ese sonido ms suave que generalmente asociamos con la distorsin de vlvulas. The Boss DS-1 is a distortion guitar pedal released in 1978 by Boss. var addy8e175d3400a34f83f6a4e52838e1faa7 = 'info' + '@'; This modification works incredibly well when used with Single Coil and P90 type pickups. The Power Supply provides energy and bias points to all the circuit. With the 26.5 dB of gain, the audio signal will be bigger than the VF of the diode (1S1588 or 1S2473 or equivalent 1N4148) that is around 0.7V in any position, creating a hard clipping action: The image above shows the waveform after the clipping diodes, it exhibits a clear squared shape limited between +0.7V and -0.7V which is the VF of the diodes. Power Supply Stage.4. When an op-amp input is driven beyond the rails, bad things happen. Usad un medidor de capacidad si es posible para obtener un valor lo ms cercano posible. 3. The purpose of this filter is just to remove the DC levels from the final output signal. The frequency response of this input buffer is dominated by the high pass filter created by C1 and R2 which has a cut frequency of 7.2Hz (fc=1/(2RC)). On the other hand, true bypass switches (3PDT) are considered to give a clean and transparent path for the bypassed signal. Sorry for my english. note: If you are using the Mitsubishi M5223AL op-amp you will need a 1K pull-up resistor from the second op-amp output to +9V. document.getElementById('cloak5230ce14d5603ba6bd88484b4b0c40a7').innerHTML = ''; At the beginning of the stage, there is an RC network (C. high-value resistor that biases the input of the op-amp to 4.5V. On the high frequencies by the low-pass filter formed by R14 and C10 will attenuate harmonics over 7.2Khz, this is better explained in the section below. Somewhere between 2.2K and 4.7K would provide the best results. ste es, por cierto, uno de los cambios del famoso Keeley Ultra Mod. The emitter feedback reduces the distortion. Para C11 y C12, cualquier tipo vale, pero los valores son muy importantes (comprobadlos si es posible). The first half of the NJM2904L dual op-amp is a simple buffer, it won't add (or remove) anything to the guitar signal. Other pedals like the Tube screamer have a complete opposite freq response (mid boost), so this characteristic is a great part of the pedal personality. In my opinion, it boosts volume and bass tones, so for blues / jazz / classic rock its a highly recommended mod. You need JavaScript enabled to view it. This remained unchanged for about 16 years. b. As you can se, only six components have been replaced. This mod should not affect the function of bypass/drive, just tone and gain. Reducing the value of feedback resistor R7 helps to tame this initial amplification, allowing the pedal to be more responsive at lower distortion settings and less like a fuzz with the drive maxed out. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); DS-1 vs modded DS1: frequency response electric-safari, https://electric-safari.com/2019/03/17/turn-a-boss-ds-1-into-a-nice-overdrive/, BOSS DS-1: modding my own mod electric-safari, BOSS OD-3 and J.Rockett Tim PierceOverdrive, Give it an asymmetrical clipping character, more pleasant to my ears and more valve-like distortion. The changes to the tone stack high pass filter in this modification effectively removes the mid frequency scoop of the stock unit when the control is in its mid position. Also since the bass frequencies dont get amplified quite as much at this initial stage it helps to keep the distortion tighter across its range. [], [] my previous post https://electric-safari.com/2019/03/17/turn-a-boss-ds-1-into-a-nice-overdrive/ I converted the DS-1 distortion pedal into something very close to an overdrive. 4.2 Input Stage Frequency Response.5. It is the loudest among all the models, at higher gain settings the distortion is fizzy (poorly made fuzz) with some noise. The fence that separates distortion and overdrive pedals is very thin. The Power Supply Stage is a simple resistor divider that provides the power (+9V) and bias voltage (+4.5V) to the pedal: The input buffer is a plain Emitter Follower (aka Common Collector) with unity gain and high input impedance that preserves signal quality eliminating tone sucking (high-frequency loss): The Q1 part is a 2SC2240 Toshiba transistor, cheap low-noise/high-gain (=200-700), nothing special here, it just does the job. (LogOut/ I tried this and while I think I did a pretty clean job for some reason when I can get it to work it takes a long time to switch from bypass to drive. The components replaced in the tone stack are C11, C12, R15 and R16. The output buffer has exactly the same circuit as the input buffer, its task is to keep a low output impedance for better signal integrity in the guitar-pedals-amp chain. 6.2 Op-Amp Gain Frequency Response. When either D4 or D5 are conducting, the impedance at R14 - C10 junction is greatly reduced. With a value of 22 Ohms, the output is so high that the signal at the output of the operational is almost always clipped. It was doing that when I had it outside the enclosure but inside the enclosure no signal passes either way now. The Operational Amplifier block is the heart of the circuit, it is build using a variable non invertingop-ampamplifier with two diodes to do the clip/distortion action and some passive RC filters ( passband = low pass + high pass) to set the clipping and the frequency at which it occurs. La frontera entre pedales de overdrive y de distorsin es ms bien fina. In a nutshell, the original high gain (454) is reduced to a more sensible value of 56 (35dB) with better immunity to noise/temperature and oscillation. If you want a further explanation of how to make all the numeric calculations, check the Tube Screamer Input Impedance Calculation; the circuit is very similar and all the maths are there. Con un valor de 22 Ohms, la salida es tan alta que la seal a la salida del operacional es limitada por los diodos prcticamente siempre. 6 year later, in 2000 the opamp was again changed by the Mitsubishi M5223AL. I do the mod whit some changes because I dont found somes components. Having taken all these considerations into account, lets review my last pedal modification. (LogOut/ 470K is a high input impedance to avoid loading guitar pickups and tone sucking, although the rule of thumb is to interface the guitar to an input impedance that is 1 M minimum. The 3PDT drives the guitar signal either through the effect circuitry, or straight input-to-output, the guitar signal does not even touch the input of the effect. Pensad en el Klon Centaur, por ejemplo (con los medios resaltados, por cierto). Asymmetrical Clipping - The stock DS-1 uses a pair of 1N4148 diodes in a hard clipping arrangement after the opamp. Now the pedal is a very dynamic, mid boosted overdrive, with a wide range of distortion. Thanks for the contribution and for sharing it! All the potentiometers, jacks and battery are wired and hand soldered which is quite labor intensive. This stage applies some frequency filtering and signal boosting before the op-amp stage. I hope you enjoy this mod, please let me know of any improvements or mistakes you may find. Input Stage. The Power Supply provides energy and bias points to all the circuit. R3 is the emitter resistance, 10K is a pretty standard value for an Emitter Follower buffer. The idea is to raise the signal levels so the next stage can work with acceptable levels although as we can see later, the signal is maybe too boosted after this stage. Teniendo en cuenta todas estas consideraciones, veamos mi ltima modificacin de pedal. The frequency response of the Op-Amp Gain stage is set in the low frequencies by the high-pass filter formed by C8 & R13 (fc=72Hz). You may opt to change this rather than the feedback resistor R7. This resistor is labeled as R40 and will force the op-amp to work into class-A reducing distortion. Boss DS-1 Distortion Sound Signature.10. It is orange and is called Distortion, so in this case it was easy. Frequencies at 7.2Hz are attenuated -3dB with a roll-off or 6dB/oct. voltage gain in this topology is collector resistance divided by the emitter resistance (R, The maths behind this topology so-called Shunt Feedback resistor are a bit complex and if you want to see the full numeric development check the. If you are rich, please send me a Klon Centaur to compare with my DS-1 modified pedal. 7.1 Tone/Level Frequency Response.8. Vf is what causes the clipping, and the higher Vf is, the higher the signal can be before it starts to clip. at the notch the loss is about -20db (500Hz) but there is no problem with this because in the previous stage after the diode clipping the signal has a 1.4Vpp amplitude, with -12dB loss the resulting signal will be 350mVpp (1.4Vpp/4times) which is fine for an output level and won't distort the input stage of the next pedal on the chain or the guitar amplifier. You could opt for two LEDs if you liked, keep them both the same for symmetric clipping, or mix colours for a bit of asymmetry (different colours will have different forward voltages; its not just for looks! The source DS-1 pedal is quite rough in distortion, with the mod reducing gain but gaining smoothness, control and presence of your guitar tone. It is important to mention that by the time this diode is conducting, the opamp is already clipping. Hi! By reducing the values of C11 and R17 we drastically shift the cut off for the tone controls high pass filter, creating a flatter response in the neutral setting. In mostcases,the electronic design of a good sounding pedal is a mix of luck, engineering, and black magic. Thanks for reading, all feedback is appreciated. Change), You are commenting using your Twitter account. It is versatile; almost clean at lower gain setting with a serious edge at high gain (slight hiss is noticeable at higher gain settings). The circuit uses a single layer PCB with standard through-hole components which makes it easy and cheap to produce. Los diodos bipolares tienen Vf=0.7V y los LED tienen Vf > 1.5V, dependiendo del color. Si sois buenos guitarristas, grabad una demo y subidla a youtube. var prefix = 'ma' + 'il' + 'to'; Algunos pedales con soft clipping son muy dinmicos mientras que otros comprimen demasiado, y la mayora parecen comprimir a la vez que distorsionan. This makes the user have a higher grade of control and variation; from a simple boosting to hard clipping. You will also want to leave C5 unchanged in this case.R13 dictates both the gain increase of the opamp and the frequency cutoff at maximum drive settings. Me gustara saber si la gente disfruta (o no) de mis mods. Hard clipping, theoretically limits drastically the signal when it reaches a certain level, so it creates those high harmonics that give it its character. Increasing this resistor will reduce the maximum opamp gain while attenuating less gain for lower frequencies. But some of the more famous overdrive pedals, known for being transparent, clean or dynamic are based on hard clipping (clipping diodes at the output of an operational amplifier or transistor). The Boss DS-1 together with the TubeScreamer and the ProCo Rat cover almost all the spectrum of tastes for vintage classic rock/hard rock guitar distortion. El hard clipping parece tener una respuesta general ms dinmica al toque de la guitarra que el soft clipping, aunque depende mucho del diseo del circuito. As usual, this model is the most expensive/difficult to find and it is claimed to produce the best sound. 4.1 Input Impedance Calculation. The CSGuitars modification aims to make changes to the following areas: Extend the clipping into lower frequencies, Reduce the overall gain and improve low end response. The 3PDT drives the guitar signal either through the effect circuitry, or straight input-to-output, the guitar signal does not even touch the input of the effect. addy8e175d3400a34f83f6a4e52838e1faa7 = addy8e175d3400a34f83f6a4e52838e1faa7 + 'electrosmash' + '.' + 'com'; The. There is an overall -12dB (4 times) loss andat the notch the loss is about -20db (500Hz) but there is no problem with this because in the previous stage after the diode clipping the signal has a 1.4Vpp amplitude, with -12dB loss the resulting signal will be 350mVpp (1.4Vpp/4times) which is fine for an output level and won't distort the input stage of the next pedal on the chain or the guitar amplifier. The second half of the NJM2904L is a non-inverting amplifier that will boost the signal up to 22.3 times (26.5 dBs) following the formula: Gvop-amp max = 1 + ( VR1)/( R13) = 1 +(100K/4.7K) = 22.3 (26.5dB), Gvop-amp min = 1 + ( 0 )/( R13 ) = 1+(0K/4.7K) = 1 (0dB). Each diode having the same forward voltage will clip each edge of the signal in the same manner. Output Buffer.9. var path = 'hr' + 'ef' + '='; Ill update the article with your changes. The bump happens at 800Hz, which for me is the best point to get a nice tone that is capable of cutting through the mix in a band context. This all-time classic Boss DS1 design has a lot of subtle things going under the radar that even the original designers do not fully grasp, in my opinion, the Klon Centaur is the pinnacle of this factor. R2 is just a moderate high-value resistor that biases the base of the transistor to 4.5V. The clipping stage defines the distortion signature sound, it is built using 2 back to back diodes that shunt the signal to AC ground (4.5V), this kind of clipping technique gives a hard-clipping sound also used in the MXR Micro-amp or the RAT opposed to the soft-clipping style created by placing the diodes on the feedback loop of the op-amp and used in other pedals like the Tube-Screamer. Los diodos LED tienen una Vf (corriente directa) ms alta que los diodos bipolares comunes. Lower frequency distortion - The first stage of the DS-1 features a couple of high pass filters designed to attenuate low frequencies and prevent them from travelling further into the circuit and distorting. For reducing distortion, I have made these two changes: For the mid boost thing, I changed several components of the tone stack. At max distortion, harmonics over 72Hz get the full gain of the distortion stage, and everything below it gets progressively less gain and distortion. Modders will unbalance the D4-D5 network to make their clipping even more asymmetric. 1- Boss DS-1 Circuit Versions.2. Therefore D8 has nothing to do with asymmetrical clipping or any kind of guitar signal modification. At the beginning (1978), the DS-1 was using the Toshiba TA7136AP opamp. Como podis ver, slo se han reemplazado seis componentes. El resalte se produce a los 800Hz, que para m es el mejor punto para conseguir un tono agradable y capaz de ser odo en una mezcla en el contexto de una banda. 5.1 Transistor Booster Frequency Response. Es pasiva, y tiende a atenuar los medios. U1 NJM3404A ( or equivalent M5223AL, BA728N), Although the circuit has been the same through the ages, the unusually SIL (Single in Line). Thanks for reading, all feedback is appreciated This email address is being protected from spambots. Quera experimentar estos conceptos con un BOSS DS-1 que compr averiado y que arregl. R39 will protect the input of the op-amp keeping the current limited on the + pin. Los componentes reemplazados en la seccin de tono son C11, C12, R15 and R16. Transistor Booster Stage. Guitar input signal in blue color 200mVpp. By simulating the circuit with LTSpice, I found the spot where the signal is mid boosted without loosing the ability to control the tone (although it is somewhat reduced compared to the original DS-1 design). A 3PDT switch. The idea is simple: it can activate the effect routing the signal through the circuit or deactivate it, bypassing the pedal core BUT keeping the input and output buffers always in the signal path. As usual, this model is the most expensive/difficult to find and it is claimed to produce the best sound. (LogOut/ No me disgustaba tal cual, pero ese tipo de distorsin no es para m, francamente.El BOSS DS-1 est basado en el clsico hard clipping simtrico, dos diodos a la salida de un operacional, y la seccin de tono tiende a dar una respuesta mid scooped, as que debe ser considerado como un pedal de distorsin. My sincere appreciation to Dave Harvey, Romeo G. Cesar, G. Brandt, K. Carpenter and D. Knapp for your support writing this article. In the Transistor Booster Stage, the Q2 asymmetric clipping gives rise to even-order harmonics which are more sonically pleasing. The circuit consists of a simple fixed -6dB/oct low pass filter (formed by R16 and C12 with an fc=234Hz) and a fixed -6dB/oct high pass filter (formed by C11 and R17 with an fc=1063Hz) using the VR3 pot to mix the two signals. No se de qu ao es tu pedal, pero si es posterior a 2005 creo, lleva la R40 a la salida del operacional que lo convierte en un Class-A. Referring to the electronic design, the current Boss DS-1 has a simple circuit: some transistor stages with an op-amp core and hard clipping diodes. 2.1 JFET Bypass Switching / True Bypass. )This is a place to experiment and see what you like best. Cheap, easy to find and perfect for mods. Output signal after the Transistor Booster Stage in red color 9Vpp (clipped). There are some popular mods to improve its tone making it thicker/stronger and more versatile (Tri-Gain / JHS / Keeley / Analogman). document.getElementById('cloak8e175d3400a34f83f6a4e52838e1faa7').innerHTML = ''; A 3PDT switch (Triple Pole Double Throw) will also allow you to light a power-on LED at the same time, which is pretty convenient. transistor booster will pre-amplify the signal and all the distortion is produced using a variable op-amp gain circuit with diodes shorting the output to ground, producing hard clipping. LED diodes have a Vf higher than common bipolar diodes. Mejora mucho el sonido final. Gain reduction - Prior to reaching the opamp the signal travels through a transistor boosting stage where the signal level is increased dramatically, the gain in this stage is so high in fact that it drives the signal into soft clipping before it even reaches the distortion part of the circuit! Usually pedals based on hard clipping, high amount of distortion and mid scooped response curve are called distortion and those ones based on soft clipping and mid boosted are called overdrive. Some soft clipping pedals are very dynamic while others are too compressed, but most of them seem to be compressing and distorting all the time. This provides more even order harmonics to the distorted sound which is aurally pleasing. Change), You are commenting using your Facebook account. Its really all about what you want the maximum setting on the drive control to do. R9 at the emmiter of Q2 controls the gain of the first stage, previous to the opamp stage. The last change was in 2006 when the New Japan Radio NJM2904L opamp was introduced. In the Op Amp Clipping Stage, the diodes (D4 & D5) are back to back connected to AC ground (+4.5V), so the clip is harder and as a hard knee giving a strong character. There is however a twist to this tale; very few of the greats used the stock modelWith the DS-1 being such a common pedal, modifications for the circuit proved popular, allowing players the ability to tailor this distortion to their own sonic desires.While there are many well documented modifications out there you could choose from, we present to you the CSGuitars mod: a selection of some of the best ideas from other mods, with a unique spin on the values to dial in a deep, dynamic distortion thats a bit more user friendly than the stock unit. By the way, this is one of the changes that the famous Keeley Ultra Mod makes to the DS-1. Reducir la distorsin (cantidad de clipping), Darle un carcter asimtrico, ms agradable a mis odos y ms parecido a la distorsin de vlvulas, Resaltar los medios en la curva de respuesta de frecuencias. During its life, the Boss DS-1 Distortion has had two schematic revisions due to components availability: a. In an Emitter Follower the input impedance can be calculated as * Remitter , so the total impedance of the pedal is: note: the simplifaction of the formula (Zin= R2) is becausethe resistor R1 is too small compared to R2 (1K<<470K) and *R3 is too big compared to R2 (200*10K>>470K), you can also make all the numbers and reach to the same conclusion. This is not an intentional filter, just a cap is needed to couple the previous transistor gain stage and a moderate-high value resistor is needed to bias the + pin of the op-amp at virtual ground (+4.5V). The capacitors C23 (100uF) and C15 (47uF) are bulk capacitance that stabilizes the power supply lines. var addy5230ce14d5603ba6bd88484b4b0c40a7 = 'info' + '@';
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