"MN3005 versus V3205" tests.

[reverofratiug]

Hi everyone

I built 2 units of the DM2. One using the MN3005, other using V3205.

After calibrating both on the scope carefully, following both datasheet voltage specs, I noticed that the MN3005 has a "cleanest sound" than V3205. The MN is running at approximately 15.5V and it´s 'free of distortion'. The coolaudio´s running at 8.2V and it has a little distortion on the repeats. Lowering the MN´s voltage to, let´s say, 9V makes the repeats to distort a litlle bit.

I also had to change C11 to a much higher value on the coolaudio´s version to avoid getting too much self-oscillastion. Actually i don´t know if that is the right thing to do, but it works.

I´d like to know if there´s any other way to reduce, or even stop the distortion on the coolaudio´s V3205. Am I doing something wrong?

And on more question. if is possible to use two 3205 on the AD3208 how can one 3102 chip ("Direct driving capability of up to 4096-stage BBD") drive two 3205 (4096-stages each)

[reverofratiug]

I forget this:

The first unit has:
MN3005
MN3101
NE570N
4558C

The second unit has:
V3205
V3102
SA571N
4558C

[nelson]

I´d like to know if there´s any other way to reduce, or even stop the distortion on the coolaudio´s V3205. Am I doing something wrong?

And on more question. if is possible to use two 3205 on the AD3208 how can one 3102 chip ("Direct driving capability of up to 4096-stage BBD") drive two 3205 (4096-stages each)

The capacitance of the clock input of the 3205 filters and rounds off the clocking signal of the 3102. The way to avoid this is to buffer the clock signal with a CD4049, this will deliver a nice square clocking signal and reduce distortion. Also allowing you to drive more than 4096 stages with a single clock.

Take a look at the EHX Echoflanger schematic for an example of this.

[reverofratiug]

Thanks for the tip dude! I´ll check that schem.