PCLONE2 Build

Welcome to the PCLONE2 build instructions!

I’ll assume you’ve done some soldering before and skip the basics, however if you do need some tips or reminders on soldering technique, please check out my page here. As kits go, this is moderate in complexity, especially the panel wiring. You should give yourself at least 4-5 hours to make the kit and go slowly and carefully - it is much easier to avoid a mistake than fix it afterwards…

Here is an image of the PCB layout which can be useful to refer to as you work, especially if you accidentally put a component in the wrong place, covering up the designator (Click here for a bigger version)

OK, Let’s begin by soldering the resistors. The different resistors can be identified by their coloured stripes, which are listed below. When reading the resistor codes you can ignore the silver or gold “tolerance band”.

The body of the resistor may be a tan or blue colour depending on the type (carbon or metal film). The body colour doesn’t matter, so don’t worry if the colour does not match the photo.

Note: The space for R3 is not populated. The kit does contain spare resistors and some extras of certain useful values for mods, so don’t be confused if there seem to be too many of a particular value, and don’t throw away the leftovers!

Now let’s fit the diodes, remembering that they need to be soldered the correct way around (and don’t heat them for too long when soldering)

Your board should now look something like this

Now lets solder the four, 8-pin IC sockets and the 9-pin header strip.

Take care to align the notch on the end of the 8 pin sockets with the marking on the board. In this layout the notch is towards the bottom of the board for each socket.

With all the sockets in place the board should be looking like this

The next step is to insert the nine polyester box capacitors.

The markings will contain other codes (e.g. “47nK100”), but check they start with the indicated value (e.g. “47n”)

Now insert the trimmer potentiometer, R45. This is pretty tight to insert into the PCB and may need a bit of waggling - be careful not to damage the legs.

Solder the LED. It is important that this goes the right way round; you’ll see that the marking on the board shows a “flat” side next to one of the legs (beside the “PWR” label). The LED has a matching “flat” (marking the negative terminal, which also has a shorter leg). Line the flats up when inserting the LED and don’t heat for too long when soldering.

Now for transistors. There are three types of transistor in the kit

It is very important not to mix them up (or you might let the magic smoke out of them as soon as you apply power!). There is an extra 2N3904 in the kit - hang on to it to use for mods…

When you solder them, make sure the “D” shape of the case lines up with the D shaped marking on the board - you need to bend or splay the legs a little to get them into the holes on the board. When soldered, the transistors should sit above the board by a few millimetres.

Almost there! Now add the electrolytic capacitors. These need to go in the right way round. The symbols on the circuit board show a tiny little (+) sign next to one hole. Put the longer leg of the capacitor through the hole. The capacitor body will also have a white stripe to mark the negative terminal (aligned with the shorter leg)

As with the box capacitors they are easy to mix up, so pay special attention to the markings

Make sure you trim back the excess component legs on the underside of the board, since the back of the board will be mounted close to the metal bodies of the potentiometers.

Now lets insert the ICs.

For IC1, IC3, IC4, IC5, make sure that the notch or dimple on the body of the chip matches the notch shown in the symbol on the board (which should also match the notch on the socket). The location for each notch is toward the bottom edge of the board.

For IC6, there is a notch along the top of the chip. This should be towards the right (There is a dot marked on the board). A firm push is needed to insert IC6 but take special care not to bend of break any legs - These are old chips (no longer manufactured) and your chip may have been recovered from other equipment, so the legs can be a bit more fragile than the other ICs.

And so, on to the wiring and assembly of the case.

Before we start, here is the wiring diagram in case you need to refer to it (Click here for a bigger version)

The wiring is actually pretty complicated and easy to get wrong, so if possible I would recommend that you stick to using the same colours for the wires as I did, and which I describe in these instructions.

However, if you are just using the wire supplied with the kit you might run out of a particular colour (as they are supplied in equal lengths). You can substitute in another without any problems - the wires are all the same type - but be careful not to mix them up.

Be careful with the length of each wire - you want to keep them short enough so they all fit in the case when it is put together (it is very easy to end up with such a bulk of wires that they wont fit!) but also you want to make sure the wires are long enough to allow you to get the PCB out of the case for troubleshooting and modding. You want them all to have the same amount of “slack” so you don’t end up with one wire shorter than the others stopping you being able to move the board.

Honestly this is the hardest part of the build, so go carefully and slowly and double check everything as you go!

Here is a picture showing what we are aiming for (don’t worry, the steps are all described below…). Basically we want to be able to access the PCB when the wires are attached, but we also want to keep the wiring as un-bulky as we can.

So lets get started, fetch the acrylic front case panel and remove the protective film from both sides. Get the six potentiometers - I recommend labelling the back of each one with a marker pen or sticker

There are three types of potentiometer, so check the marking on the front of each. In the order as viewed from back of panel the potentiometers are

DO NOT break off the locating tabs from the potentiometers (as you might have done in other kits). There are holes cut for the tabs in the panel and they will stop the pots moving around when the knobs are turned.

Remove the nut and washer from each one and insert them into the panel as shown below (check the location of the large round hole in the panel matches the photo). Replace the washer and tighten the nut. Double check all your pots are in the right place and the panel is the right way round (it will be MUCH harder to correct it later!)

Now add the four switches. They are inserted into the read of the panel in order:

Remove the nuts and washer and turn the locating plate around so the tab faces forwards. When the switch is in place the tab should align with the small hole cut in the panel. I use a single nut to fix the switch in place and discard the grip washer.

One of the switches is a double-pole (DPDT) switch with six terminals. This is placed second from the left as shown in the photo below. All the other switches are identical single pole (SPDT) switches.

Take about 5cm of purple wire and solder it between the bottom left and top right pins of the DPDT switch as shown below. Solder one end of a 470 ohm resistor (YELLOW-VIOLET-BROWN) to the same bottom left pin as shown. Solder the resistor close to the switch.

Use red wire to connect

Use 5cm of grey wire connect the top left pin of the DPDT switch to the bottom right, then connect these to the left tab of the SWEEP pot using about 7cm of grey wire.

Using about 4cm of purple wire, connect the right tabs of the DECAY and SENSITIVITY pots together. Add another 15cm length of purle wire to the right tab of DECAY.

Strip back about 2cm of insulation from a 17cm piece of yellow wire, to bridge the left and middle tabs of the DECAY pot.

Now place the face plate on to the panel

Use six black M3 allen bolts to attach the face plate. The top two bolts are secured by nuts and the lower four bolts are secured by attaching the brass standoffs. Tighten the bolts carefully so that they are just tight enough to be secure. Warning : Overtightening the bolts may bend or crack the face plate

Use about 1cm x 1cm of the sticky foam pad to attach the piezo transducer to the back of the face plate within the circular space near the DEPTH control. Take care not to break the wires off the transducer.

Make sure the transducer wires can reach the top right of the panel, and tuck them back behind the other wiring

Locate the five 3.5mm sockets and their fixing nuts

Place the sockets into the five spaces along the top of the panel. Make sure that the sleeve tab (on the side of each socket) is on the lower edge, and bend it back slightly so it is about 45 degrees from the body of the socket.

Secure the sockets using the fixing nuts. Finger-tight should be fine.

Strip the insulation off about 7cm of wire and twist the strands together. Use this to connect the sleeve tabs of the five sockets as shown.

Trim the wires from the piezo transducer to an appropriate length and connect the black wire to the bare wire we soldered in the previous step. Connect the red wire to the lower tab on the right hand socket.

Use about 8cm of white wire to connect the left tab of the DEPTH control to the left tab of the PITCH control. Add another 10cm of white wire connected at one end to the left tab of PITCH

Connect yellow, blue and red wires (about 15cm length each) to the RATE control, extending them below the bottom edge of the panel. Connect a green wire of about 14cm length to middle tab of DEPTH control.

Connect a blue wire of about 10cm to the middle tab of the SWEEP control

Connect 15cm red and grey wires to the left and middle tabs of the SENSITIVITY control

Connect 10cm green and grey wires to the middle and right tabs of the PITCH control

Connect two 18cm orange wires to the top and middle pins of the right hand switch

Connect blue, yellow and purple wires of about 20cms each to top, middle and bottom pins of the second switch from the right

Attach green and yellow wires of about 16cm each to the left middle and right middle pins of the DPDT switch

Connect two 20cm grey wires to the top and middle pins of the left hand switch.

Connect orange and green wires of about 22cm to the left hand socket and bare ground wire as shown

Connect a 20cm white wire to the top pin on the right hand socket

And now we have a great ugly mass of wires… yay!

Tidy the wires up using zip ties and routing the bundles between the potentiometers:

Bundle the white wire from TRIG input with the wires from the SENSITIVITY and DECAY controls (Five wires; white, puple, red, grey, yellow). Route the bundle along between DECAY and SWEEP pots then downwards between DEPTH and SWEEP

Bundle the wires from the CLICK and VCO WAVE switches (Five wires; Blue, yellow, purple, orange, orange). Route the bundle down between DECAY and SENSITIVITY pots and between SWEEP and PITCH)

Twist together the green and orange wires from the OUT socket

Bundle the wires from the PITCH control. (Three wires; white, green, grey). Route along the white wire between PITCH and DEPTH

Bundle the yellow and green wires from the SWEEP DIR switch with the blue wire from the SWEEP pot. (Three wires; yellow, green, blue). Route downwards from the SWEEP pot

Bundle the wires from the LFO WAVE switch with those from the RATE pot (five wires; grey, grey, yellow, blue, red). Route between DEPTH and SWEEP pots then along towards the right side

Now we can start attaching the wires to the PCB. Not all of the holes are used so make sure that you are connecting your wires to the correct holes. Also try to trim all wires so that they have minimum excess bulk while still allowing the PCB to be moved.

First off, the wire from the right hand socket, and the SENSIVITY and DECAY controls. All the wires are joined from the rear of the PCB.

Now the wiring for PITCH, the DPDT switch and the SWEEP pot

For DEPTH

For RATE and also the grey wires from the LFO Shape switch

Now the wiring from the other two switches and the output socket. The switches are connected to a row of holes near the middle of the board (The first hole is empty)

Twist together a pair of red and black wires of about 22cm. Connect these to the (+) and (-) power supply pads on the PCB (Unfortunately I didn’t get a photo of this step)

Now pack the wiring carefully under the PCB and attach the PCB to the spacers using the screws provided

Attach the power connector to the acrylic end panel

Solder the power leads to the socket. The shorter tab is the central pin of the power socket - most guitar pedal style 9V DC adaptors connect this to the negative supply and have the plug barrel as the positive supply. If you are using this type of supply, connect the wires as shown. If you want to use a centre-pin positive supply, solder the wires the other way around.

Note: The rectifier diode on the board protects the circuit from damage by incorrect polarity but the device won’t work with the wrong type of adaptor.

Now is a good time to try it out, before you assemble the enclosure…. move all the control pots to their fully clockwise position and also turn the trim pot R45 fully clockwise. Connect an amp/speaker (start at low volume!) and apply power. Tap the piezo… you should be hearing something… if not, refer to the troubleshooting section

Otherwise let’s finish things off! Locate the four flange nuts and remove the film from the acrylic side panels

Push the hexagonal parts of the flange nuts into the holes using pressure from your thumb. Do not hammer them or use a a vice etc as you will shatter the acrylic!

Note that the laser cut holes for the nuts are very slightly tapered (due to the shape of the laser beam) which means the nuts can be pushed in more easily from one side of the panel than the other. Try to ensure the nuts are inserted from the wider side of the hexagonal holes.

Ensure the film is removed from all the remaining acrylic parts and assemble the sides of the case. Make sure the flange nuts are on the inside! Push on the 5mm acrylic side cheeks which hold everything together.

At this point leave the back of the case off, so we have access to the electronics in case we need to trouble shoot anything. Later, add the back panel by removing the side panels.

Use the remaining four allen bolts to attach the side panels. Be careful not to over tighten the bolts as this could crack the side panels.

Wind all the pots to their lowest position and attach the knobs (when pots are at minimum the marker on the knob should be at about the 8-o’clock position)

Congrats! you are done. Enjoy the PCLONE2!