+15 volt on +5 volt and visa versa mistake

Hi,

I made a mistake while working on the cymbal part. Because of the constant flipping of the main pcb these 2 wires came loose. And i resoldered them the other way around and have put power on them for 10 seconds during testing of the voltages of the connections of the op amps.

I didn't smell any burning so that maybe hopeful. But after i fixed it the voltage of 1 pin of U5 gave me +14.1 volts. Which is below the 5% margin. The rest of the cymbal voltages are normal

Does anybody know which parts i could have damaged? I know there is only one cap that should run on 10 volts (the 100/10) and i think the op amps are also ok because they take 15 volts if i'm correct.

I'm mostly worried about the other IC's and maybe the transistors. But i don't know enough about electronics.

Thanks in advance!

I've finished the build but as i thought it doesn't run. Sometimes all the 16 steplights light up and than some stop. After turning it off and on there are no lights. At least when the interval of putting power is short. Like 5 seconds. After that they do light up. There is noise on the master output but coems and goes when i turn knops and switches.

Also i've got the p version of the eprom so i tried to upload the new OS but no go. The First 8 steps don't do anything. Even at 25% speed.

Maybe e-licktronic can help.

Also i didn't test the sounds during building but i brought my 606 with trigger output with me but i'm not sure i can still test it while it's finished building. Anybody knows?

Thanks!

You can still test the single instruments with an external trigger but you have to remove the atmega from the board.

Did you already build the sequencer when you made this mistake btw?

ikke wrote:You can still test the single instruments with an external trigger but you have to remove the atmega from the board.

Did you already build the sequencer when you made this mistake btw?

Thanks! No i didn't. I made this mistake before i build the sequencer. I guess the 5 volt is mostly for the triggers and the 15 volts are for instruments right?

Btw i checked for heat but nothing feels warm. Als checked all the volts going to the mainbord but they all are correct.

Gona test the individual instruments now without the atmega chip. I presume i can use the normal output jacks right?

The total sequencer is powered by it's 5V rail, and the instruments by +/-15V indeed.

Yes, when finished you can use the jacks on i/o board.

Good luck!

ikke wrote:The total sequencer is powered by it's 5V rail, and the instruments by +/-15V indeed.

Yes, when finished you can use the jacks on i/o board.

Good luck!

Thanks! I think i blew up the op-amp of the bassdrum. I accidentally connected the trigger to both r155 and r152 and i heard a very long bassdrum sound. Then it faded away. Only when i touched the op-amp i would hear it vaguely for some seconds.

Later i used the correct way. 5 volt of board to the r152 and trigger out of the 606 to r155 but the only thing i hear is the sound of the trigger somewhere in the distance.

Also i've downloaded the schematic of a real 808 to see where the points trigger and accent resistors are for the bassdrum but i can't find the r155. Or do i have to use different schematics for the yocto.

Also i think it's better if i try to the the sequencer to work first.

I'm sorry to hear about that!
When looking for the test points it's better to use the Yocto schematics.
I also think that your problem is sequencer related but knowing the analog side is
working properly is quite useful and that's where i would start.

If you think you blew up the op-amp than maybe you have a spare TL072 that you could try out in place of U12 in the bassdrum
but i doubt if that's the case.

ikke wrote:I'm sorry to hear about that!
When looking for the test points it's better to use the Yocto schematics.
I also think that your problem is sequencer related but knowing the analog side is
working properly is quite useful and that's where i would start.

If you think you blew up the op-amp than maybe you have a spare TL072 that you could try out in place of U12 in the bassdrum
but i doubt if that's the case.

Thanks!!

Thing is i can't find the yocto schematics. I saw a link here in the first post but it doesn't work.

viewtopic.php?f=16&t=179#p686

And yes i thing i have a tl072 somewhere i think. I looked for nec c4558c online but these are not easy to get in the Netherlands so far i have looked.

Edit: i think i found the schematics: https://www.dsl-man.de/display/DSO/Yocto+Schematics

Yeah, they hidden them on the store product page under downloads.
I'm Dutch too btw so feel free to curse at me...

Hahaha no way. Very happy you help me

I tried the snare drum and still i could hear only the trigger and not the sound.

Also i think i may have not blown an op-amp. The topic i posted before talks about a trigger signal. And a tr 606 sends out a gate signal like a 101. That's why the guy with the dr 110 got it working. It's got that v-trigger the yocto needs.

Now i need to find a machine with s trigger. Or use a program to send it from my computer.