Super Hard On

Rated as one of the best guitar boosters, this classic and simple DIY project is the Super Hard On. The gain is a negative-feedback control styled after classic 60's recording console inputs. It is perfect to obtain the best of a classic amp and guitar.

Created by DHEA
Status: Active

PCB ASSEMBLY Step 3 of 4

You should use a solder pencil of 15-30W and solder of 1 mm of diameter 60/40 (60% tin, 40% lead). The solder will release fumes that are harmful to your eyes and lungs, work always in a well-ventilated environment and avoid breathing the smoke created.


Warm up the iron and clean it with a humid sponge before soldering. Place the component and firmly hold the PCB on the table or holder. Heat the pad and the lead for one second by touching them at the same time. Then, feed around 1-3 mm of solder and make sure it flows properly. If the solder has not been applied correctly you can create a bad connection (cold solder joint). A good connection should cover the path and lead without touching any other pad. Finally, cut the lead with a cutter and inspect the joint by visual or by using a multimeter.


Assemble the components on the side of the silkscreen according with the designators and with their correct polarity. It is recommended to solder the components from small to big: resistors, diodes, capacitors, transistors, potentiometers... The PCB is designed to mount the potentiometer on the silkscreen side. In order to protect the BC170 transistors from overheating, use can use a clamp as a heat sink when you solder it. It is possible to assemble the components on both sides if required, just be careful to keep their correct polarity.