Hi all,
last week I (almost) finished my Yocto. It's from a complete kit I got 2 years ago. Shame on me, for finishing it so late. Most stuff worked right from the stuff. Unfortunatly the complete kit contained a fake CD4011BE, so accent is not working, until I get a new CD4011BE. Without it all instruments seem to work fine.
The only issue left is a continous background tone at the mid tom/conga. Hear for yourselves:
https://soundcloud.com/martin-ley-1/mid-tom
The recording is done with the mic-input of my laptop, so ignore the distortion.
The pitch and volume changes when changing the level and tuning pots and switching tom/conga.
Does anyone have an idea, what's wrong?
Mid-Tom continous background tone
Those are actually the conga's, not the toms
Ground the switches ( viewtopic.php?f=16&t=720 ) and the noise will mostly vanish
are you using an internal power supply?
Ground the switches ( viewtopic.php?f=16&t=720 ) and the noise will mostly vanish
are you using an internal power supply?
Get the latest unofficial Yocto V1 firmware here.
Be sure to check the revised manual.
Leave your comments in this thread.
Be sure to check the revised manual.
Leave your comments in this thread.
I'm using a wall-wart type external powersupply. I will try grounding the switches. Thanks for the advice.
The continuos tone is present on both mid conga and mid tom. In the sound file you can hear, when I switch from one to the other.
The continuos tone is present on both mid conga and mid tom. In the sound file you can hear, when I switch from one to the other.
Grounding the switches did not improve the sound noticably. The constant mid tom/conga sound is still there.
The low and high tom/conga were fine, even with the ungrounded switch housings.
When I tap with the scope pin 7 of U17, I see a pretty strong signal, when not triggered. At the same point (pin 7 of U15) in the low tom/conga, there is silence.
The low and high tom/conga were fine, even with the ungrounded switch housings.
When I tap with the scope pin 7 of U17, I see a pretty strong signal, when not triggered. At the same point (pin 7 of U15) in the low tom/conga, there is silence.
As Fabi303 guessed correctly in a chat conversation yesterday, one of the germaniun diodes is bad.
The diode tester of my multimeter shows a value other than overload when testing against flow direction.
Now I have to get some replacement diodes (some, because I also need some to build a distortion circuit).
The diode tester of my multimeter shows a value other than overload when testing against flow direction.
Now I have to get some replacement diodes (some, because I also need some to build a distortion circuit).