This graduation thesis describes the process of creating a distortion guitar pedal, called Dallas Rangemaster. The distinctiveness of this distortion pedal lies in the transistor made of germanium, which is rare and expensive, and gives a special sound. Since the circuit diagram is designed for the PNP type of transistor (positive ground), it was necessary to adapt the scheme to modern power supply with negative ground. Such a modified scheme of the original was used to simulate the circuit itself, in which the response of the circuit at 100 mV and 1 kHz was shown at the change of potentiometer values. After completion of the simulation, the assembley was tested on the experimental plate, and making sure that the assembly was functional, it was possible to make the assembly on a perfboard plate. At the very end, it was necessary to connect the assembly on the perfboard with hardware on the chasis, and test the entire assembly with an electric guitar as the circuit input, and a guitar amplifier as the output from the circuit.