Component value and frequency response

[CheapSuitG]

Hi Hi!

Been doing some mods of commercially available pedals like the DS-1 Seeing Eye Mod and possibly want to start modding PPCB builds.

That said, I am a paint buy numbers guy right now so following instructions but not know why I am doing what I am doing.

Is there a chart/spreadsheet/something that has the frequency response of components? For example I read "Change C1 to X value it will add more low end". I am learning some about that but if there was a spreadsheet of what frequency it does impact, like X will let 300hz and up through, that would be awesome.

Thanks!

 

[PunchySunshine]

Hi Hi!

Been doing some mods of commercially available pedals like the DS-1 Seeing Eye Mod and possibly want to start modding PPCB builds.

That said, I am a paint buy numbers guy right now so following instructions but not know why I am doing what I am doing.

Is there a chart/spreadsheet/something that has the frequency response of components? For example I read "Change C1 to X value it will add more low end". I am learning some about that but if there was a spreadsheet of what frequency it does impact, like X will let 300hz and up through, that would be awesome.

Thanks!

TSC

TSC in the web

 

[DailyDovetails]

RC and RL Passive Filter Calculator | DigiKey Electronics

Calculate the -3dB cutoff frequency of RC and RL circuits for both Low and High Pass filters using DigiKey’s passive filter calculator.

www.digikey.com

With that you can calculate the corner frequencies for high and low pass filters.

I found a lot of the electro smash articles very helpful to learn what everything does. Then you can calculate what you want to change. https://www.electrosmash.com/proco-rat there are a bunch of common circuits on there.

 

[lowpitch]

One of the best ways to actually see how changing different component values affects frequency response is simulating the circuits in LTSpice. Unfortunately, this will be a little bit of a time sink. Very rewarding though!

 

[JTEX]

^ I second that motion. It may be a bit hard to get started with a circuit simulator, but if you get the hang of it, it will have been time well spent.

Having said this. I tried LTspice and there was absolutely no way in hell I was going to deal with that. I absolutely hate the user interface. These days I use Tina-TI (free from Texas Instruments), and in the past I've also used Simetrix/Simplis. They also have a free version.

 

[JTEX]

There's this too. Possibly the easiest to get started with, but I have barely touched it myself:

Online circuit simulator & schematic editor - CircuitLab

Powerful online circuit simulator and schematic editor. Easy to learn.

www.circuitlab.com

 

[CheapSuitG]

Interesting links, I will check them all out!

 

[darwin999]

Been doing some mods of commercially available pedals like the DS-1 Seeing Eye Mod and possibly want to start modding PPCB builds.

If you've played with the Boss DS-1, then you might look at this analysis article (if you haven't already done so) - it might help build your intuition:

ElectroSmash - Boss DS1 Distortion Analysis

The Boss DS-1 is a distortion guitar pedal released in 1978 by Boss. It was the first distortion pedal made by Boss with a distinctive hard-clipping sound perfect for high gain rock and metal still keeping the character of the original guitar.

www.electrosmash.com

I also support the idea of simulation - I use LTspice, which is free from Analog Devices and fairly easy to use - look at this web page:

https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html

Good luck!

​

 

[darwin999]

Been doing some mods of commercially available pedals like the DS-1 Seeing Eye Mod and possibly want to start modding PPCB builds.

And here's another site that looks at the frequency analysis of DS-1 (for potential intuition building):

Boss DS-1

The fourth pedal to be analyzed will be the classic Boss DS-1 “Distortion” guitar effect. Like the SD-1, the DS-1 is one of the most popular and longest running pedals in the Boss lineu…

guitarpedalsvisualized.wordpress.com

 

[Passinwind]

One of the best ways to actually see how changing different component values affects frequency response is simulating the circuits in LTSpice. Unfortunately, this will be a little bit of a time sink. Very rewarding though!

This. But if you actually do the homework and use the excellent support forum at https://groups.io/g/LTspice and the various threads here useful results can come fairly quickly, IME.

It's also possible to run WAV or MP3 files through LTspice and render something you can listen to, although generally not in real time.

 

[giovanni]

I would also suggest familiarizing with common opamp and transistor configurations so you can learn how to calculate input/output impedance which you will need to calculate the bandwidth of those stages. I find that much faster than simulating the whole circuit every time.

 

[CheapSuitG]

I would also suggest familiarizing with common opamp and transistor configurations so you can learn how to calculate input/output impedance which you will need to calculate the bandwidth of those stages. I find that much faster than simulating the whole circuit every time.

Great suggestion, thanks!