4xD - PCBs & Parts kits
I originally planned to sell only the 4xD PCBs but since quite a few people asked if I can supply some of the less common parts I decided to put together some kit options. None of the options are a complete kit as I don't want to spend the time counting out every last resistor, but kit (5) contains everything except the most readily available components.
I don't have any PCBs left now and it's unlikely that I will do another run. Please consider the Digi-Mod instead which can do most of the things the 4xD can, plus a lot more.
Surface mount components
There are a fair few surface mount components in this project and, as I realise many people will not have stocks of these, kits (3), (4) and (5) contain all needed surface mount components.
There's nothing too microscopic, so with a bit of care it can all be hand soldered easily. All resistors and capacitors are 0805 size which is pretty chunky by modern standards, and most ICs are 0.8mm pitch or bigger. The exception is the CODEC ICs which are 0.65mm pitch (but only 28 pins) - they simply aren't available in any other package. However, even these 0.65mm pitch parts are fairly easily soldered with the right technique.
You will definitely need some very fine no-clean solder and a no-clean flux you can apply directly to the PCB. And you'll probably need some fine no-clean desoldering braid to remove any solder bridges between IC pins. All of these things are available in the Optional Extras section below.
If you want to get an idea of the surface mount sizes involved, you can print this actual-size (at 300dpi) TIFF file of the component layout: pcb_components.tif. In all there are 2x 1.27mm pitch ICs, 3x 0.8mm pitch ICs, 2x 0.65mm pitch ICs, 58x 0805 resistors/capacitors, and 3 SOT-23 transistors. Everything else, including all the analog side of things, is thru-hole.
Prices
I'm not doing this to make lots of money - only because I love to create and share cool sonic toys. For the kits I have added 20% to my cost price to cover my time in picking the components and to safeguard against any price rises. All cost prices and supplier part numbers are listed below.
The only place where I will really make any money is for the pre-soldered and pre-programmed option. The price reflects the fact that it will take quite a lot of time to solder all the SMT components and really I'd rather not be a factory worker ;) For less than half of this price you can buy all the soldering materials and an ICD2 clone to program the PICs yourself - honestly SMT soldering's really not so scary .. go on, give it a try! (And of course if you have an ICD2 you can program new software updates whenever they become available.)
Delivery
Kits will be sent by either 1st Class (for UK) or Airmail post. Since the maximum claim for loss of normal post is £30, unless you are only buying a PCB, I suggest you pay the additional amount for insurance/tracking of your order. The shipping prices are in the Optional Extras section below. I will ship everything promptly, although if you want the pre-soldered, pre-programmed option you will have to wait a bit longer.
Payment
If you're UK based I can accept payment by cheque or bank transfer, otherwise Paypal is easiest. I have 2 Paypal accounts: a 'personal' which cannot accept payments originating from credit/debit cards, and a 'premier' which can accept all payments but charges me a fee. If you want to pay from credit/debit card then you can calculate the fee below:
To make an order just email me at
Kit options
| (1) | £30.00 | PCB only | |
| (2) | £89.09 | PCB + PICs + SRAMs + CODECs | |
| (3) | £93.79 | PCB + PICs + SRAMs + CODECs + All other SMT components (transistors, resistors, capacitors) + PCB mount switches | |
| (4) | £100.45 | PCB + PICs + SRAMs + CODECs + All other SMT components (transistors, resistors, capacitors) + PCB mount switches + Less common thru-hole capacitors + Crystal | |
| (5) | £122.37 | PCB + PICs + SRAMs + CODECs + All other SMT components (transistors, resistors, capacitors) + PCB mount switches + Less common thru-hole capacitors + Crystal + All other ICs (OPA2340s, 6N139, LM317, 7805) | |
Please see the Optional Extras section below for shipping rates.
Kit contents and individual item cost prices
| Part | Rapid part no. | Farnell part no. | Qnty | Price (ex VAT) |
Total (inc VAT) |
In Kit 1 | In Kit 2 | In Kit 3 | In Kit 4 | In Kit 5 | Notes |
| PCB | 1 | £25.00 | £25.00 | y | y | y | y | y | |||
| 2K2 0805 SMT resistor | 72-0817 | 3 | £0.008 | £0.03 | y | y | y | ||||
| 10K 0805 SMT resistor | 72-0867 | 16 | £0.008 | £0.15 | y | y | y | ||||
| 47K 0805 SMT resistor | 72-0947 | 2 | £0.008 | £0.02 | y | y | y | ||||
| 100nF 0805 SMT ceramic cap | 71-1380 | 24 | £0.017 | £0.48 | y | y | y | ||||
| 1uF 0805 SMT ceramic cap | 71-0509 | 12 | £0.017 | £0.24 | y | y | y | ||||
| 2.2uF 0805 SMT ceramic cap | 71-0510 | 1 | £0.034 | £0.04 | y | y | y | ||||
| 470pF low K ceramic disc cap | 08-1246 | 12 | £0.16 | £2.26 | y | y | |||||
| 1.5nF polypropylene cap | 10-1435 | 4 | £0.17 | £0.80 | y | y | |||||
| 2.2nF polypropylene cap | 10-1445 | 4 | £0.17 | £0.80 | y | y | |||||
| 2.7nF polypropylene cap | 653196 | 4 | £0.094 | £0.44 | y | y | |||||
| 6.8nF polypropylene cap | 10-1455 | 4 | £0.20 | £0.94 | y | y | |||||
| dsPIC30F6012A-30I/PF | 2 | £7.67 | £18.02 | y | y | y | y | Price includes £12 Microchip delivery charge split over 8 ICs | |||
| PIC16F877A-I/PT | 1 | £3.09 | £3.63 | y | y | y | y | ||||
| IS62C1024AL-35QLI SRAM | 1077672 | 2 | £6.67 | £15.67 | y | y | y | y | |||
| CS4272-CZZ CODEC | 1023371 | 2 | £5.07 | £11.91 | y | y | y | y | |||
| OPA2340PA Opamp | 1097472 | 8 | £1.81 | £17.01 | y | ||||||
| 6N139 | 1021341 | 1 | £0.49 | £0.58 | y | ||||||
| LM317T | 47-3318 | 1 | £0.32 | £0.38 | y | ||||||
| 7805 | 1102157 | 1 | £0.25 | £0.29 | y | ||||||
| MMBT3904 SOT-23 NPN transistor | 742960 | 3 | £0.073 | £0.26 | y | y | y | If MOQ not met, order Rapid 47-4132 instead | |||
| DPDT PCB mount slide switch | 733581 | 2 | £0.82 | £1.93 | y | y | y | ||||
| SPDT PCB mount slide switch | 733568 | 1 | £0.66 | £0.78 | y | y | y | Price is for RoHS compliant version, but will ship non-RoHS if available | |||
| 25.000 MHz Crystal | 90-3319 | 1 | £0.27 | £0.32 | y | y |
Optional extras
| Part | Rapid part no. | Farnell part no. | Qnty | Price (ex VAT) |
Total (inc VAT) |
Notes |
| 28swg no-clean SMT solder + 10g no-clean flux syringe | 85-6276 | 1 | £7.40 | £8.70 | Not RoHS compliant, price includes £1 extra shipping | |
| 0.8mm no-clean desoldering braid | 85-0616 | 1 | £1.45 | £1.70 | ||
| Spectrol 110E series rotary encoder | 3282284 | 7 | £4.36 | £35.86 | ||
| Spectrol 248 series 50K log pots | 68-1294 | 4 | £1.86 | £8.74 | I have a feeling a linear pot may work better - my experience using mine, which is built with log feedback pots, is that the useful feedback range tends to be bunched up the top end of the pot position. So I'm going to ship linear feedback pots instead (p/n 68-1282). | |
| 7-segment LED display (green) | 57-0246 | 1 | £1.15 | £1.35 | ||
| 7-segment LED display (red) | 57-0240 | 1 | £1.15 | £1.35 | ||
| All SMT components, ICSP headers, PCB mount switches pre-soldered, and PICs pre-programmed | 1 | £100.00 | £100.00 | |||
| Extra OPA2340PA Opamps for CV input option | 1097472 | 2 | £1.81 | £4.25 | ||
| Shipping to UK (value over £30 at own risk unless insurance option taken) | 1 | £2.00 | £2.00 | |||
| Shipping to Europe (value over £30 at own risk unless insurance option taken) | 1 | £3.00 | £3.00 | |||
| Shipping to Rest of World (value over £30 at own risk unless insurance option taken) | 1 | £4.00 | £4.00 | |||
| Shipping insurance / tracking | 1 | £5.00 | £5.00 | This is an extra cost added to the basic shipping price |
More ..
- Overview
- User manual
- Photos
- Audio samples
- Schematic
- Parts list
- PCB layout
- Source code
- Construction guide
- PCBs & Parts kits
- Surface mount soldering