Two slide switches, legs may need light forming to fit.

Next fit the three snap fit 3.5mm mono sockets.

Note: It is critical that these are really tight to the PCB and the flat edge behind the thread is aligned with the edge of the PCB.

This is to ensure the socket will be in the correct position when you affix the side panels later on.

The snap fit does most of the work, but sometimes light pressure during soldering will ensure the best result.

Thread the wires from the piezo disc on the front panel through the hole and tie a simple knot.

The tape applied to the piezo disc helps with strain relief and stops components shorting out on its metallic body.

Note: The 3.5mm mono jack

Solder the wires onto the pads marked Piezo +/-.

Red wire   = Piezo +

Black wire = Piezo –

Place the potentiometers and switches in their footprints but DO NOT solder them yet. We will solder them after a few more steps

The potentiometers should snap into the PCB, sometimes the mechanical legs need pushing outward slightly to get a tight fit.

On the bottom each potentiometer has its value marked: B102 = 1k0, B504 = 500k, A104 = 100k

Place the top panel on.

Snap the left side into place try not to put too much sideways force on the potentiometer shafts.

This stage can often be made difficult or impossible if the mono jacks are not properly fitted or the legs of the mono jack are bent outwards. 

Screw the nuts onto the mono jacks.

Repeat for the right hand side.

Make sure all the sides look square with respect to one another and the unit has very little play.

Tightening the mono jack nuts should remove any excess wobble

We’ll solder the potentiometers before the switches.

Apply a small amount of solder to one mechanical (large) pin of the potentiometer.

Place a finger firmly on the potentiometer and reheat the joint, as the joint melts you will be able to feel the potentiometer move into place.

Test the potentiometer before soldering the rest of the pins. The potentiometer shaft should not rub on the panel when turned, if it rubs repeat the reheating of the joint but apply gentle pressure away from the rubbing point.

When you are happy with the fit solder all the pins and repeat the process for the others.

Note: rubbing will not cause the drum synth to not work, but will cause the potentiometer to have a shorter working life and be more difficult to turn.