[SOLVED]No sound, No BD,CH

ElSchtroumpf wrote:Quick question : do you have (access to) an oscilloscope?

Not for the moment, I need to buy one or bring the yocto to my work place

Yes try to check the individual instruments with an oscilloscope, it's very strange you have no sound even though your sequencer works.

Ok I tried the bassdrum 5V to R152 pulse to R155 and out on R175. I used the tip of my headphone (ground to ground) and i heard the bass drum.
I put back the atmega and tried to "hear" the TRIG signal and there is none

I watched some yocto demo videos to compare behavior. My step-1 LED lights well with the sequencer but when I activate the step 1 it remains turned off and when I activate another step , step 1 blinks. I double checked every solder joints with a magnifier and all power suplies everything is fine.
Any ideas

(still no sound)

check this I did a little video to demonstrate what I said earlier

https://www.youtube.com/watch?v=TBOvFCLvO84

I'll get an oscilloscope around the 20th of the month I'll be able to do deeper tests

For the step 1 button issue - have you checked with a multimeter if there is a short between any of the pins associated with those buttons?

Dear Electrosymphony,

If you got a problem with all trig signal maybe it come from the 4011.
When did you buy your Kit ? if it was before December the 1th, you have to replace the 4011 in the Accent section.
And for the first step button problem, check R21

Best regards,
e-licktronic

Ok I found something I checked R21 it was perfectly soldered then I did a measurement with multimeter I found 2K first I measured other 10k around and they were all at 10k. I removed IC7 to see if there was any interactions between the chip itself and the resistor and I found 10k. Then I tried to exchange IC7 with IC2 since they are the same chip. Now step 1 is working and guess what step 9 isnt

Now I have to buy a new 74hc165 this one was defective.

When did you buy your Kit ?

After the 1st december

I replaced my defective 74hc165 now sequencer works fine. I bought another 4011 too but still no change i have no sound output I think there is no trig signal comming from CPU Is it possible ?