Boss DS-1 Clipping Frequency Range

[SAlundra]

Hi,
Boss DS-1 is one of the best distorsion for me but need to be mod to be very powerfull.I want to know what do you think of frequency range of clipping D4/D5, just the high pass who is done with C8 / R13.

2.2k + 1uf = 72.4hz who is the standard DS1 frequency.
1k + 1uf = 159.2hz who clip less bass frequency.

With 1k you don't boost 100 hz who is fundamental of guitar that some inge reduce to boost harmonic, like that the sound is not muddy.

Thanks,
SAlundra

 

[cctsim]

Since the cut-off frequencies are measured related to the max gain, a higher cut-off doesn't necessarily means reduced harmonic boost at a specific frequency.

In fact, in this case the gain at 100 Hz in the case of R13=1k is a bit more.
The amount of extra gain you get at min/max DIST setting is between ~ 0.5 - 3.5 dB.

 

[SAlundra]

Do you think 1k is too high ?
At high volume, less gain is necessary to have a good sound.
Maybe 1k is too high ?

Thanks,
SAlundra

 

[cctsim]

Do you think 1k is too high ?
At high volume, less gain is necessary to have a good sound.
Maybe 1k is too high ?

Thanks,
SAlundra

For my taste definitely too much gain.

I personally like the 1uF and 4.7k combination most that the original MIJ had.

The best place to reduce bass is C3 in my view. 0.033uF or even 0.022uF should do the job.

 

[SAlundra]

33nF cut bass before 48.3hz instead of 33hz, i think it's the best value and better than stock as you said.

R9 220ohm + R13 2.2k = less high frequency, stock gain.
I'm not sure it's the same gain than stock.

Maybe it's the best couple value, what do you think of that ?

 

[cctsim]

33nF cut bass before 48.3hz instead of 33hz, i think it's the best value and better than stock as you said.

R9 220ohm + R13 2.2k = less high frequency, stock gain.
I'm not sure it's the same gain than stock.

Maybe it's the best couple value, what do you think of that ?

If you increase R9 the gain of the transistor CE stage preceding the op-amp will go down a bit, which is a good thing in my view. Check at the Collector electrode of the transistor the DC bias as the change in R9 will affect it and you may need to re-adjust R6.

http://www.muzique.com/news/fat-mod-for-the-boss-ds-1/

Instead of changing R9, you can also change C4 to something 680pF or 1nF.
This will bring down the high frequency gain too and you don't need to worry about the DC bias.

 

[SAlundra]

220ohm for R9 doesn't need to change R6.
C4 is a good alternative but a treble boost is necessary because of ToneStack who have not too much high, the best is to have more OP-amp gain and less transistor gain surely.

You said 1uf + 4.7k, so 33hz, like Boss MT-2 has, it's a fullrange clipping, it's not necessary i think because of 80hz/75hz highPass.1uf + 2.2k is 72.4hz is maybe better than 33 hz, 50hz is boom frequency, who is bad frequency.

 

[SAlundra]

With 1k for R13, Boss NS-2 doesn't stop correctly the noise, 2.2k is the max value possible.

What do you think of C4 as you said before ? Do you think it's necessary to increase it's value for decrease high frequency ?

 

[cctsim]

220ohm for R9 doesn't need to change R6.
C4 is a good alternative but a treble boost is necessary because of ToneStack who have not too much high, the best is to have more OP-amp gain and less transistor gain surely.

You said 1uf + 4.7k, so 33hz, like Boss MT-2 has, it's a fullrange clipping, it's not necessary i think because of 80hz/75hz highPass.1uf + 2.2k is 72.4hz is maybe better than 33 hz, 50hz is boom frequency, who is bad frequency.

As I said before the cut-off frequencies need to be taken relative to the max gain and they are not 33 Hz and 72.4 Hz.

With 1uF + 4.7k the overall max/min gain at 30 Hz is for example less than in the case of 1uF + 2.2k because R13 controls the maximum gain. The lower the value the more gain at mid band frequencies.

Have a look at the simulations plots below to see what I mean: (left: 1uF + 2.2k, right: 1uF + 4.7k )

 

[SAlundra]

I play at max gain, i use ds1 for heavy metal, max gain of DS1 is just what I want not too much. Peavey 5150 for exemple has too much gain I think at max gain.

Thanks for your graph, it explain exactly...all. 2.2k + 1uf at max gain = more high mid (800hz - 5khz ).

The graph is better with 2.2k + 1uf i think.

I think i will use 2.2k + 1uf and push 100ohm for R9.
Maybe it's the better thing ?

 

[SAlundra]

Do you think it's a good thing to add 2 1n4148 to have more output with the expense of little distorsion ?