PCB's FOR THE MOST POPULAR PROJECTS ON THIS WEBSITE. AVAILABLE HERE.
I'm in the proces of designing PCB's for the top visited projects on my website. The idea is to create some revenue to keep this website affordable for me because it has grown so much it's becoming a day job and it's not generating any income but I want it to remain freely accessible for all. So by purchasing a PCB you're not only guaranteed a successful build (PCB's are verified to work) but you're also helping keep this website afloat which will be very much appreciated.
I ship PCB's in aircushion envelopes which keeps shipping costs down. Shipping costs € 4,- world wide, If you order more than 3 boards shipping will be €6,-. There's no track and trace with this method but I keep in close contact with you to let you know how things stand. (For largers orders I can arrange track and trace shipping on request.)
Latest news:
NEW STEINER-PARKER Filter boards just in!
ALSO THE KORG-MS20 and the STATE VARIABLE FILTER all in stock now.
Expected in week 29: 10 New PCB's for the Precision ADSR. I just received 5 Eurorack sized panels for this ADSR. I'm also expecting new PCB's for the Thomas Henry 555VCO.
HOW TO ORDER:
You can order your PCB's by using this PayPal link for payment --- CLICK HERE ---
Just look below for the PCB(s) you want and if it's more than one, add the prices up and then add €4 to the total for shipping for up to 3 PCB's. If you order more than three PCB's then add €6,- to the total for shipping.
Please do not forget to mention the PCB(s) you want, how many you want and the address you want it to ship to. I do not automatically get your address so please don't forget it.
You can also contact me on Facebook Messenger and order that way if you prefer the safety of being in personal contact with me. Please don't forget I'm in the Central European Timezone, so if you contact me from the other side of the world it might take a few hours for me to respond at certain times of the day.
3rd week of June I received the first confirmation that a parcel has been received in the United States, in good order, so my shipping method does work. It took 14 days to get there. No extra custom duties. Shipping times can vary a lot. For instance: I've had packages arrive in the U.K. in two days and others that took 10 days. For shipment to Australia expect the parcel to be in transit for about a month. I have had no reports of anything going wrong with shipping.
I have PCB's available for the following projects:
PROJECT 67: The Kassutronics Precision ADSR.
Price: € 10,- per PCB (Out of stock. New stock expected very soon.)
A very small board of only 4,5 CM by 7,1 CM. It features the Rene Schmitz, gate input with manual trigger option and my attenuverter mod. I just built it up. It took me 45 minutes to solder the components in and an other hour to take the stripboard version out and solder this PCB back in behind the panel. It really works very well. It has a risetime of just 300µSec on the fastest Attack time. (250µSec faster than my stripboard version)
It has a LED to indicate the envelope is being generated.
You can mount this board by soldering in one of the potmeters directly into the board so it's at 90° to the faceplate and wire the rest of the pots up from there.
The potmeters holes are next to eachother but they're too close to eachother to mount them all directly in the board. For the next version I will have two pots on the front side of the PCB and two on the back side so you can solder the pots straight in, but even like this it's an easy build believe me.
PROJECT 57: The Thomas Henry X4046 VCO with the famous Hard Sync sound. The best HS of all analog VCO's.
Price: € 10,- per PCB (OUT OF STOCK. I will re-stock these if I get a request for at least 2 boards.)
Wiring Diagram for this VCO:
This PCB is 58 by 113mm. It's fully verified and I found it easier to tune than the stripboard version.
PROJECT 56: The Thomas Henry State Variable Filter VCF1.
Price: € 10,- per PCB (5 in stock)
An awesome sounding filter with Lowpass, Bandpass and Highpass, each with their own outputs. The filter sounds like a Steiner Parker diode filter but I think it's a bit more musical in the resonance. It's fully self-oscillating. Below you can see the mounted board. This is the old version. The new one is a bit better laid out with smaller solderpads.
New version:
Here's the wiring diagram for the State Variable Filter PCB.
The value for C1 and C6 is not mentioned on the PCB but it's on the diagram below. C6 is 100nF and C1 is 10pF:
PROJECT 35: The Resonant Lowpass Gate.
Price: € 10,- per PCB (2 in stock.) Panels €10,- a piece (2 in stock)
An amazing sounding VCF/VCA combination using Vactrols. This module really sounds amazing when built on PCB. These are newly designed PCB's designed to go straight behind a panel with only the switches and in- and outputs to be wired up. I also have panels for these PCB's. My first self designed front panels.
The size of the PCB is 56mm by 97mm.
Wiring diagram for versions 1.0 and 1.1 of this PCB (the old versions):
Top 3 potmeters seen from the back. CV-1 level pot seen from the front.
Here's the wiring diagram for version 3.0:
The actual working of the 3 pole switch is reversed from what is shown in the wiring diagram. Just keep in mind: The respective function of the LPG (VCF, BOTH or VCA) is active if their switch setting is open. I know that sounds counter intuitive but that's how it works,
The first two batches of these PCB's sold out very fast. I have new stock though. The newly designed version V3.0 circuitboards just came in. These are optimized for eurorack. Order yours now while they're still in stock!!
I now have panels for sale for the Lowpass Gate. They are Eurorack size and 12hp wide (6CM). With the normal mounting method (PCB at 90° to the faceplate) the resulting module will be 5.8 CM deep.
Here's an alternative PCB mounting method. This will make the depth about 4 CM and make it fit a Nifty Case for instance.
In the picture above you can see how I mounted the board flat behind the panel. Solder 1 mm thick copperwires to the potmeter pins at a 90° angle to the potmeters so they stick up if the faceplate is flat on a table. After soldering all the components into the PCB, mount it by lowering the PCB over the potmeter copperwires sticking up, and solder them in. Make sure you mount the trimmers and the powerconnector on the backside of the PCB so you can get at them if you use this method.
On the other side from the potmeters I soldered a copper wire to the ground of the sockets. With sandpaper I made a clear copper patch on the PCB near the lower mounting hole and soldered the copper wire to it. Now the board is solid as a rock.
PROJECT 26: The STEINER-PARKER DIODE FILTER.
The size of the PCB is 53mm by 91mm
Price: € 10,- per PCB. (9 in stock).
I finally got good working, verified PCB's for this very popular filter. It's certainly one of my all time favourites. This is from the original Yusynth schematic. I built it up in just under an hour. It sounds amazing. In the stripboard version I could never really hear how the All-Pass mode worked but with this PCB version you can hear it clearly.
There are three trimmers on this board. The lowest one (blue multiturn trimmer) is for calibrating the throw of the Cutoff potmeter. I set it to it's middle position before soldering it in and frankly I didn't have to adjust it afterwards. The second one, just above the Cutoff potmeter connection, is the one that balances the the two sides of the diode ladder. Adjust simply by ear. Set it to what sounds best but don't put it all the way clock- or counterclockwise.
The third one is one I put in myself, as a replacement for R18. This is to help calibrate the Resonance potmeter. Set it in such a way that you get the best reaction from the resonance potmeter. That's usually just a few hundred Ohms.
The Resonance potmeter should be a 50K reverse logarithmic potmeter but I think few people have those so check the original article for the Steiner Parker to see how you can make your own reverse logarithmic potmeter if you don't have one. (It's simply a matter of soldering a 100K resistor between pins 2 and 3 of the potmeter.)
Here's the wiring diagram for this filter. Be accurate in copying the wiring of the rotary switch!
As you can see you only need to connect 4 wires to the switch solderpads on the board. One for the switch wiper and one each for LP, BP and HP. The Allpass mode is done with the wire on the switch itself going from pin B4 to pin A1. It connects Lopass and Highpass together creating Allpass.
Again, copy the wiring of the rotary switch accurately like you see it here.
Put the diodes in with the black band upwards, folding the leg on that side over. The anode goes in the round hole with the circle printed around it. The cathode side (with the black band) goes in the square holes with the K printed next to it. (K for Kathode). The diodes don't have to be matched really. Just make sure they all come from the same batch of diodes. You can buy a 100 diodes for a few dollars. The two BC547 transistors do need to be matched. I simply matched them by comparing their Hfe factor with my multimeter. You should really use the Ian Fritz method for matching. It can influence to sound significantly if they are not well matched.
I have actually ordered PCB's for the transistor matching circuit. So keep an eye out for those.
Short demo of the Steiner-Parker filter:
PROJECT 18: The Digisound 80 VCO with the AS3340 chip.
Price: € 10,- per PCB (3 in stock)
This PCB is suitable for Eurorack modules. It's 54 by 104mm and it has been optimised for use with a dual 12V powersupply. (The original design is for dual 15V)
New version of the PCB:
Here's the wiring diagram for this board (potmeters seen from the front, shaft facing you):
Above you see the PCB compared to the stripboard version.
This PCB also includes the Pulse Width Modulation mixer which enables you to have an external Pulse Width Modulation signal come in and still change the Pulse Width with the panel control too.
I have made a better design than v1.0 and the boards just came in. The new boards have smaller solderpads for the in- and outputs. I built this version to test it and believe me, it was so easy to tune this VCO, it was amazing. On dual 12V powersupply I had it tuned over 5 octaves within 10 minutes with only a few cents between the octaves. It's the best tuning experience of any VCO I ever built.
PROJECT 12: The KORG MS20 FILTER with HIGHPASS and LOWPASS mode.
Price: € 10,- per PCB (7 in stock.)
Finally a PCB for this popular filter.
I built one up myself and it sounds great, see video below.
The PCB is very very small. Only 39mm by 93mm so ideal for eurorack. It only took me half an hour to solder all the components in. You can solder one potmeter straight into the board and use that to mount the board at 90° behind a panel. Then you can connect the rest with hook-up wire..
Wiring diagram for this PCB. (potmeters seen from the backside):
Here's a short demo video of the filter in action. The audio for this filter needs to be attenuated. This filter can not handle high audio levels straight from the oscillator. So if you build this project make sure you include a level potmeter for the audio input and put a level potmeter on at least one of the CV inputs aswell, so you can regulate the ADSR input to the filter. (I'd would recommend level pots for all but the V/Oct input)
The TRANSISTOR CURVE TRACER.
Price: € 15,- per PCB (OUT OF STOCK! New ones expected this coming week (week 29))
This is a small board made from the schematics in the article on my website. This one board contains 2 curve tracer circuits. One for NPN transistors and one for PNP transistors. The PCB's are verified.
The components are all through-hole but they are rather crammed in together so you need to make sure you order capacitors with a 5mm footprint. Mine were a bit bigger but it still worked fine. The connections for the transistor under test and the scope probes are just solderpads so you need to come up with your own way to mount the transistors. I used very small copper tubes as you can see in the pictures below. It would be ideal to use a ZIF IC socket (google them) on a piece of stripboard wired up to this PCB or simply use a breadboard to put the transistor under test in and connect it to this circuitboard.
You can build it up using any type of NPN and PNP transistors you want. The circuit is very forgiving. The PCB board is designed to work with BC type transistors with the C-B-E pinout. (I mean the transistors for the actual circuit. Of course you can test any type of BJT transistor with this board). You do need a good oscilloscope with an X-Y display option.
(Note: there are three components with no value next to them: C8 and C9 are 100nF and C12 is 10nF)
The new PCB's:
The new PCB's are 55.5mm by 132.7mm
I have ordered new PCB's that will also contain a transistor matching circuit using the Ian Fritz method. These boards will have Transistor Curve Tracers for NPN and PNP and matching circuits for NPN and PNP. They will be very useful in the electronics lab. I expect them about end of July.
MORE PCB'S FOR OTHER PROJECTS WILL BE ADDED AS THEY COME IN SO CHECK BACK IN REGULARLY!.