MFOS VC Reverb Module Bare PCB

£18.59
(£22.31 UK, incl VAT)
7210-065
32 g
In stock
+

A bare PCB for the MFOS Voltage Controlled analogue reverb unit

  • Voltage controlled reverb level
  • Voltage controlled original level

Supplied without components or instructions, Soundtronics stock all components needed to build these modules.

Erratum

The offical MFOS PCB differs slightly from the instructions / PCB layout on the MFOS website. The VC Reverb was the last product from Ray Wilson before his passing and a few anomalies remain with the PCB. We have identified what we believe are the only differences which are a few components to form a high pass filter R9, R39, R40 & C27. Also C1 and C5 see further down the page.

 

R40 (100k) is solder on the rear of U1 between pins 3 & 4.

 

R9 (10k) is soldered to C27 (22nF) before soldering into the R9 position. It is important the resistor and capacitor are soldered exactly as per the photo below. R39 (1k) isoldered from the casing of the phono socket to the junction of R9 and C27.

 

Finally, D4 is shown as Z2 on the PCB silk screen and with an incorrect orientation. Photo below shows D4 in its correct position.

 

 

Gary J from Florida also pointed two other differences that we did not mention in the erratum above which relate to C1 and C5.

C1 is a 1uF tantalum capacitor in the schematic and parts list but the PCB silk screen only shows a non-polarised capacitor. C5 on the PCB shows it being polarised but is actually a 100nF non-polarised ceramic capacitor.

 

When soldering in C1, make sure the +v side of the capacitor is facing towards U1.

 

The spacing for C5 is too narrow so simply form the leads to suit, it does not matter which way around it is soldered in.

 

Greetings from the USA. I was purchasing from you when MFOS was shut down during Ray's illness and although I purchased my latest board (VC Spring Reverb) from Synthcube here in the states, they have not had the courtesy of posting the differences between Ray's fabrication layout and the board being sold today. Since you were kind enough to clear up the high-pass filter mystery, I thought I would share a couple of other issues that I noticed. Perhaps they don't apply to the board you are currently selling but they do apply to the board I just received here in Florida. C5 on the board is screened and drilled with spacing for a radial leaded electrolytic cap with polarity. The parts list calls out a ceramic cap. C1 on the board is screened and drilled with spacing for a ceramic disk without polarity. The parts list calls out a tantalum cap. Polarity can easily be determined by referencing the schematic and using a DMM. If this is a universal problem, perhaps it can be corrected during the next run of boards? If not, sorry to waste your time! Kind regards, Gary Jordan Port Orange, Fl, USA

Asked by Gary Jordan | 08/08/2020, 06:24 | 1 answer(s)

So I jus started stuffing this board w resistors and noticed that this board is different than the one on mfos website!? R39 and r40 are missing! I do see that u have some blank resistor looking spots on another place on the board next to r13 and r14. Idk if these have anything to do w my r39 and r40 problem tho. need help!!!

Asked by Jeff | 06/04/2018, 04:25 | 1 answer(s)

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