The Sinister Exaggerator PCB lets you build a super-modded Rat clone, custom-designed with bassists in mind! It is as heavy as it is nasty.

Out of stock

SKU: PCB-SE1 Category: Tags: , , ,


The Sinister Exaggerator PCB lets you build a super-modded Rat clone, custom-designed with bassists in mind! It is as heavy as it is nasty, and you can use it to build a variety of different Rat flavors. With the recommended default part values, you get a fully-featured pedal with a wide range of possibilities from a filthy distortion, to (and this is my absolute favorite use-case) a sinister low-gain overdrive combined with an exaggerated treble range (for those who love the sound of pick attacks) reminiscent of the Harmonic Percolator. Thanks to the magical “Grit” control, the Sinister Exaggerator can easily achieve brutal bass tones inspired by David William Sims, Bob Weston, and Justin Chancellor.

The following are the standard external controls for the Sinister Exaggerator PCB:

  • Distortion — Controls the amount of distortion in the signal. 
  • Grit — Also known as the Ruetz mod, this control affects the maximum amount of gain that the circuit can achieve, allowing you to find excellent nuanced tones from anywhere in between overdrive to distortion distortion. It also flattens the frequency response. For you low-gain overdrive loving bassists
  • Filter — Modifies the amount of high frequencies being filtered by the circuit’s low-pass filter.
  • Volume — Controls the output volume of the circuit.

I highly recommend socketing the integrated circuit on your Sinister Exaggerator PCB build, so you can discover which op-amp you like the best. I have personally tried this circuit with a handful of IC’s, including both the classic and metal can LM308, 741, OP07, TL071. Each have their own advantages depending what you like.

All in all, the Sinister Exaggerator is a great spin on the Kalamazoo classic, and makes for an absolute must on your bass pedalboard. And even if you’re a guitarist, you will definitely find something to love about this dirty beast of a distortion as well!

Note that this is the price only for the circuit board. You will need to source your own parts.


There are no reviews yet.

Be the first to review “Sinister Exaggerator”

Your email address will not be published. Required fields are marked *

Return Policy

I gladly accept returns and exchanges.
Contact me within: 7 days of delivery
Ship items back within: 14 days of delivery

I do not accept cancellations on custom orders.
But please contact me if you have any problems with your order.

I cannot accept returns or exchanges for custom or personalized orders
unless the item arrives damaged or defective.

Conditions of Return:
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.

Shipping Information

Processing Time:
Depending on availability, the time I need to prepare an order for shipping varies. For custom builds, please allow 3-4 weeks lead time. For finished builds, please allow 1-2 weeks for processing.

Estimated Shipping Times:
Eco Post: 7–5 business days estimated distribution time for most destinations (see below), 10–12 business days estimated distribution time to Australia and Hong Kong.
Registered Mail: 4–8 weeks
I will do my best to meet these shipping estimates, but cannot guarantee them. Actual delivery time will depend on the shipping method you choose.

*** UPDATE***
Postal systems around the world appear to still be adapting to the global impact of COVID-19. This means that shipping times may be longer than we had previously been used to. I ask that you please be patient while we track the status of your package together.

Shipping Methods:
I ship out all pedal orders via Eco Post. This method is typically quicker than Registered Mail (advertised estimation is 7–5 business days, but due to the current situation has been known to take a bit longer, depending on the country), and it also features computerized tracking and proof of delivery.
This method is available in the following countries: Austria, Australia, Italy, Ireland, the United States, Belgium, Brazil, the United Kingdom, Germany, Denmark, South Korea, the Netherlands, Hong Kong, Greece, Japan, Norway, Spain, Poland, Portugal, Finland, France, Canada , Sweden, Switzerland, Thailand, Russia.

For PCB orders, you can choose between Eco Post and Registered Mail.

Customers living in Israel can arrange for Local pickup, just contact me for arrangements.

Customs and Import Taxes:
Buyers are responsible for any customs and import taxes that may apply. I am not responsible for delays due to customs.


Each Carcharias Effects pedal is hand-made by one person in his home workshop who loves making music, and making things that make music. Every purchase you make enables me to continue making more pedals, so your support is very much appreciated. That said, I take responsibility for the build quality of every pedal I make comes, and offer a 24-month warranty on each one, not covering normal wear-and-tear or abuse.

All the PCBs that I sell on this site were designed personally by me, but the fabrication is outsourced to third-party PCB fabrication services. Once they are designed, I order them in relatively small batches. I personally test every batch that I receive; however, as I am a strong believer in minimizing waste, there are cases in which I may sell perfectly functioning PCBs that might have some design flaw. I take responsibility for these design flaws (if any) and will specify their fixes or workarounds in the product's specific build document.

If you should encounter any issues with your product, please feel free to reach out to me via the contact form on this website. As I am based in Israel, I understand the inconvenience added by international shipping, and so I will be happy to assist in troubleshooting with you any problems before resorting to international shipping in case a repair needs to be made.