Messages

Hi Brian!

All parts are as listed on the project. The only mod is a 500K C pot for gain (as indicated as possible mod).

Voltage measures are:

IC1
1      -2.9 mV
2      -2.9 mV
3      -1.5 mV
4      8.8 V
5      2.7 mV
6      2.2 mV
7      0 mV
8      4.6 mV
9      -1.1 mV
10    0V
11    -8.67V
12    0V
13    -2.9 mV
14   .-3.5 mV

IC2
1      0V
2      0V
3      0V
4      8.8V
5      0V
6      -1.7 mV
7      -2 mV
8      2.7V
9      1.17V
10    0.73V
11    -8.67V
12    20 mV
13    22 mV
14    -22 mV

Hi there!

Just finished my Nautilus. It works pretty much good. All modes and range and sweep. The effect works.

The only thing I found out of normal is that when I hit a string, as the notes sustain it makes like a "fizzy" noise... like a really low fuzz... it saturates. This happens in somes modes and depending if Range and Sweep mode is set.

Triple check everything. Accidentally discovered that if I disconnect the power and I turn ON the effect, the signal goes through. Is this normal? Does not supposed that if there is no power through the circuit non signal should pass?

Any opinion is welcome!

Google Dpdt true bypass.  Stinkfoot.se has a great diagram.

Ok.

But the method that I'm using it's true bypass.

                                      [both "out" pins are linked]
millen.                                         millen.
control     fx out     out                  control       fx out         out
    x----------x          x                       x               x-----------x

    x----------x          x                       x               x-----------x
  out          in       fx in                    out             in          fx in

            effect off                                      effect on

Ok. Perfect clean bypass.

I'm using this DPDT wiring:

control     fx out     out       [both "out" pins are linked]
    x            x          x

    x            x          x
  out          in       fx in

If you disconnect the in/out from the PCB to the switch do you get clean bypass?  What Dpdt wiring are you using?

Good point. Check and report what happen.

How I did not think about that? 

Thanks for the answer.

Circuit works perfect. Also I've checked millennium and desolder the relative pin on DPDT and still same issue.

I'm an average diyer but this is completely new for me.

Hello there! This is my first post, although I'm regular visitor. I really like the feeling on this forum, so I'll start to share. 

I've built a DIY MC-401 (CAE Boost/Line Driver) following this schem




Ommitted parts are in red. Just ommitted this to use another type of LED switching because I couldn't find J117 FET's. Instead, use a DPDT with millenium bypass for On/Off LED.

Here is the thing: the effect works perfectly. But when it is turned off, a volume swell appears (going from low to high, like a fade in).

This only happens when the potentiometer is from 8 o'clock to the end. The "fade in" increases as you turn the pot clockwise.

If the pot is set to 7 o'clock (we can call it unity gain or "no boost") there is no fade in. So, if the pot is in fully counterclockwise when the effect is turned off, the signal level remains constant as should be.

With the pot in any other position, a "fade in" shows up.

Any ideas for debugging this?

Greetings
Luqqas.