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 Forum index » DIY Hardware and Software » YuSynth
Help troubleshooting Dual Gate Slew
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dstrength



Joined: May 23, 2010
Posts: 17
Location: Mobile, Alabama, USA

PostPosted: Tue Feb 18, 2014 1:22 pm    Post subject: Help troubleshooting Dual Gate Slew Reply with quote  Mark this post and the followings unread

I'm troubleshooting a Dual Gated Slew module, and both sections 1 and 2 are exhibiting the same behavior:

1) In LIN mode, the slew time is very short even at values of 1M on P1.

2) In LOG Mode, the slew time works normal, but the rise / fall direction switch doesn't seem to affect the slew. That is, I get slew in both directions all of the time. (The direction seems to work in LIN mode, but it's hard to tell since the slew time is so short.)

Now, I've noticed that I used BF245B instead of BF245C. I realize the B has a lower gate-source voltage range and a lower zero-gate-voltage drain current than C. But, I'm not sure how / if I can adjust the circuit to utilize the BF245B...or if it is even related to the problem.

Any ideas or suggestions?
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yusynth



Joined: Nov 24, 2005
Posts: 1234
Location: France

PostPosted: Sat Feb 22, 2014 9:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Since they share the same cap it is normal that the LIN slew is faster than the EXP slew.
The RISE/FALL switch definitely should give a different behaviour, check that your diodes are not dead (short-cut) and correctly polarized.

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