| Author |
Message |
OW
Joined: Nov 03, 2009
Posts: 122
Location: London
|
 Posted: Sun May 29, 2011 8:25 am Post subject:
ADSR output too "high" |
  |
|
Hi,
I recently build a Yusynth ADSR (old version). When I connect it to my synthesizers VCA, and turn the VCA output to 0 there is still a sound. I believe that the ADSR output is too "high".
Can anyone recommend a possible solution? Could I maybe add a resister to the output jacks of the ADSR?
Any help would be greatly appreciated!
Thanks! |
|
|
Back to top
|
|
 |
yusynth
Joined: Nov 24, 2005
Posts: 1314
Location: France
|
| Posted: Sun May 29, 2011 1:05 pm Post subject:
|
|
|
The old version has the usual problem of this ADSR core, there is a residual 0.2V at resting. Which VCA are you connecting it to ? Usually this is not a problem because the mute level of the VCA can be adjusted (internal trimmer) to a lower level.
This problem is corrected in the next version of the ADSR to appear on my site soon.
_________________
Yves |
|
|
Back to top
|
|
|
OW
Joined: Nov 03, 2009
Posts: 122
Location: London
|
| Posted: Sun May 29, 2011 2:20 pm Post subject:
|
|
|
Thank you for the reply! I am using it with a MFOS minisynth plus VCA, which upon reviewing the schematics I believe it not to have an internal trimmer.
Is there anyway of fixing this problem by modifying the current circuit as a pose to building a new one?
Thanks again. |
|
|
Back to top
|
|
|
yusynth
Joined: Nov 24, 2005
Posts: 1314
Location: France
|
| Posted: Sun May 29, 2011 3:26 pm Post subject:
|
|
|
If you are using the Soundlab Mini, you may change the value of R17, try 120K instead of 150K.
Otherwise you may replace the diode D2 in the yusynth ADSR by a BAT41 Schottky diode or a germanium diode (1N34A/1N270)
_________________
Yves |
|
|
Back to top
|
|
|
Benjamin AM
Joined: Nov 04, 2010
Posts: 83
Location: Boise
|
| Posted: Tue Sep 13, 2011 11:57 am Post subject:
|
|
|
| yusynth wrote: | If you are using the Soundlab Mini, you may change the value of R17, try 120K instead of 150K.
Otherwise you may replace the diode D2 in the yusynth ADSR by a BAT41 Schottky diode or a germanium diode (1N34A/1N270) |
I'm experiencing this problem(.2V sitting at rest) with V.2. Will the diode swap work on this version?
(EDIT.)I swapped D2 out for a BAT41, it worked very well. The Envelope Generator no longer activates the VCA while in the quiescent state. Although, if I look into the LED, i notice that it is still slightly illuminated. I raised the resistor(R22) to reduce the brightness while at rest. |
|
|
Back to top
|
|
|
Benjamin AM
Joined: Nov 04, 2010
Posts: 83
Location: Boise
|
| Posted: Thu Nov 17, 2011 5:00 pm Post subject:
|
|
|
Update to my previous post.
| Quote: | | if I look into the LED, i notice that it is still slightly illuminated. I raised the resistor(R22) to reduce the brightness while at rest. |
For some reason when I was testing this module, I would hold the gate and wait for the LED to turn completely off. Come to find out, the LED won't turn off completely(stays slightly illuminated) until the gate is removed. I am fine with how this actually functions, I was previously under the assumption that it wouldn't turn off at all. In that case the LED would have been very annoying. I am going to replace R22 for the suggested value.
Also, I wanted to ask a quick technical question. I recently added a modification to this circuit, it is a second input and Schmidt trigger. The idea is to create a reset, making staccato or no sustain a bit easier. That is, I create a positive trigger(0V to 15V,2 ms) with an external differentiator circuit that turns changes in my keyboard CV into a quick pulse. This pulse is then patched into the new input which is a duplication of the original input all the way to the pin2 of the 7555. Therefor Q1-Q3 are included. The new circuit is not connected to pin 4 via the "new" Q2, but is connected to pin 2 via Q3. It seems to work very well. I was curious if I would need to separate the outputs of the "old" and "new" Q3s where they converge at Pin 2 of the timer?? |
|
|
Back to top
|
|
|
|
Forum index » DIY Hardware and Software » YuSynth
FAQ
Calendar
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Chat Room
