I got mine built yesterday. I started from the filter couple days ago. Bought the common parts from reichelt. At first i thought that they did some serious over packing as they included their whole catalog(!) and had put all different types of parts to different bags and labeled them. Many bags had only one component etc…
But when i started to build it i noticed how convenient it was. I just checked component values from board and took corresponding part from the bag. No need to check resistors with multimeter etc… (i trusted their labeling, i hope that was not mistake).
This was easiest Shruthi-1 that i have built so far. BUT, that didn’t prevent me from ruining it!
I was so excited about how it would sound that after i had made 4-PM filter board i run to test it with my earlier Shruthi-1 (with SMR4 filter). I replaced SMR4 board with 4-PM filter and it booted nicely. I saw how Wolf’s red eye went to bright red.
While testing it, 4-PM filters regulators touched contacts from one of the switches in control board and caused short circuit!
I didn’t noticed that regulators can touch legs of some switch until later, i just wondered what it does and how. Like why that led in the wolf’s eye is lid some times right after power on, then next time it’s not etc. (At that phase i didn’t knew that it was made to do that kind of stuff, i just read that from another post…).
What that short circuit did then? I think i noticed it after that older shruthi-1’s control board didn’t boot anymore. It went to “waiting firmware mode”. As it is called by pressing S6 while power on, i concluded that regulator did it mistakely.
I tried to send firmware to it and it seemed to work, i got update process done and display showed normal characters again.
But it didn’t react any button presses anymore. And after power off, screen went to blank again.
So i clearly broke something from control board.
Today when i got 4-PM control board done and tested filter board with it i noticed that it does not change its filter mode. It can be changed to anything but it does not make any sound difference. Resonance flavour worked correctly. I heard the difference.
BTW. i got filter mode changed occasionally by at first changing mode value, and then turning power off. When i turned power back on, it was changed. Not all times though… Couple times it changed when i moved boards a little. That made me suspect that connector is broken, but i couldn’t find anything. Besides there is not much to break. I tested connections with multimeters “peeep” mode.
Once it changed from HP to LP when i was removing power cable.
I replaced 4-PM filter boards regulators as i had few extra parts, didn’t have any effect. I also tried to swap those chips that those two filter boards had in common.
Thought: could it be that short circuit between regulators and switch caused some chips to fry in both boards? Like M74HC165 at the control board?
I have no idea where to look in 4PM filter board. Like i said, everything works in it except changing filter mode.