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 Forum index » DIY Hardware and Software
Twin-T oscillator
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Sonic



Joined: Dec 02, 2010
Posts: 84
Location: Toronto

PostPosted: Sat Aug 24, 2013 4:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. Yes I have some 560K resistors. Lazy of me not to try that - I will. I suppose I just thought the resistor values were already so insanely high...
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Sonic



Joined: Dec 02, 2010
Posts: 84
Location: Toronto

PostPosted: Sun Sep 01, 2013 6:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

I had just some 510Ks. Put them in series with the 3.3s. No change. I don't think I have the chops to debug this. Ah well, time to learn some filter basics I think. I have Bernie Hutchins' Musical Engineer's Handbook which seems to have a good section on active filters but first I'm going to look for some resources on simple passive filters which will hopefully teach me some principles which apply to filters in general.
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elmegil



Joined: Mar 20, 2012
Posts: 1534
Location: Chicago
Audio files: 14

PostPosted: Sun Sep 01, 2013 7:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

I should have looked at your breadboard photo more closely before.

I can't tell for sure, but it looks like you may not have all the power/ground rails chained appropriately. I can see where you chain the + rail from one to the next, but I can't see the ground rail except for the first two. In particular I don't see anywhere that the third ground from the left could be hooked up to the others.

Normally I do that chaining all the way at the bottom of the breadboards so that I can be sure I've got it right. That's especially important when using + and - rails (which means I need three even though the breadboards typically only supply two per side).
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