I bought the Simple LFO 1.4 a couple of weeks ago. It has been quite the journey! (with a very positive ending)
I assemble it on an evening, was very uncertain about the placement of diode D2 and D3. Decided it would be best not to test that very evening, since I was already kinda tired.
The next day: I tested it, and it didn't work, just didn't do anything. Immediately thought about the diodes. Tried removing them and re-placing in all ways, never got the expected voltages at the test points. Just removed them (read on your blog they were only for protection, guess I'll have to be careful :D ) No change at first. I was ready to give up...
Then I remembered I also seem to have a different way of connecting the plugs. I searched for a picture on the site, which showed them more clearly. And decided to follow his lead with the colors of the wires.
And then: it seemed to work. Not fully as I expected however. It would only give something at the bottom end of the range. Again, time for bed.
The following day, it worked perfectly! Very strange...
It's a very nice module with slow and fast LFO's! I'm also fond of the negative/positive waves, gives nice effects with modules that don't support it (such as Music Modular's Chord organ). Recommended!
Just one suggestion: make it clearer in the assembly guide how to place the diodes, and how to wire the plugs to the pots and jack. I had to hunt for pictures on his blog how they were connected, and the diodes I never figured out.
Response from Electronic things... and stuff | Nov. 5, 2020
Hello Bert, Thank you for your feedback. I'm sorry you had difficulties with the orientation of D2 and D3.
The diodes are mounted vertically, with the "Cathode Up": the white band on the diode must be opposite to the PCB if you place the diode over the white circle drawn on the PCB. In other words, the Cathode must be connected to the square pad while the Anode is connected to the round pad.
I will try to update ASAP the documentation to emphasize on this point, and on the wiring to the jack and switches.
Also, please, do not hesitate to contact me if you have any question regarding the build process or the use of your LFO.
I have built a self-contained synthesizer loosely based on the EMS VCS3, though using a patchbay of 7 x 11 1/4" jack sockets in lieu of a Pin-Matrix. The modules were designed by Tony Allgood of Oakley Sound Systems and built by Paul Darlow of Krisp1.
I have now started designing an auxiliary cabinet to sit above the VCS3 and provide sequencing and reverb across a 3U and 1U panel (68HP).
The Compact Eurorack Power Bus will take power from a 4MS RP30 and distribute it to the following modules:-
Dual Barton BMC029 Clock Divider
Dual Barton BMC044 4-Knob sequencer
Dual Belton (Brick) single Channel Reverb
Pittsburgh Modular OUTS
Foxfield GEARBOX Clock Generator
Mattson Buffered Multiple
Foxfield UTILFO (x2)
The CEPB conveniently provides the headers required by the Foxfield modules.
A 'courtesy' socket also provides power for modules from Analogue Systems.
It was a very easy build, although I didn't include the Cap, LED and Resistor options.