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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Bi'n'tic not quite working
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dougseidel



Joined: Feb 10, 2010
Posts: 63
Location: NJ

PostPosted: Mon Feb 21, 2011 10:40 am    Post subject: Bi'n'tic not quite working Reply with quote  Mark this post and the followings unread

I'm using the bridechamber PCB - the basic filter works, and the oscillator works, but i can't get a clock signal at the 4024 (it stays at +7v). The signal at the common emmiter just before that is 0.7v peak. Does anyone have any advice?

Thanks
Doug
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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
Audio files: 4

PostPosted: Wed Feb 23, 2011 4:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

I had this problem with one bintic board and not with another, even tho they were built side by side with identical components. Another member here had it too, otherwise it seems to be rare.

Try attaching a capacitor between ground and the node of pin 2 of the LM311, 18pF cap and the 15K resistor.
For me 100pF worked, RF used 330pF. If you get up to 470pF and it still doesn't work your problem is likely to be different.

This is a bodgy fix, kinda like using gaffer tape to hold your car together.... but it works.
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dougseidel



Joined: Feb 10, 2010
Posts: 63
Location: NJ

PostPosted: Thu Feb 24, 2011 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks a lot, I will try that. I think somehow or other the signal at the base of that grounded emitter bjt needs to be higher...
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andrewF



Joined: Dec 29, 2006
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Location: australia
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PostPosted: Fri Feb 25, 2011 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

yep that was the problem with mine
the cap fixed it....or masked it Smile
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dougseidel



Joined: Feb 10, 2010
Posts: 63
Location: NJ

PostPosted: Fri Feb 25, 2011 7:08 am    Post subject: Reply with quote  Mark this post and the followings unread

that magically worked! that's a relief.
thanks for the help from so far away!
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