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 Forum index » DIY Hardware and Software
Minimoog and the tis97 transistor
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delayed



Joined: Jun 24, 2008
Posts: 129
Location: TN

PostPosted: Tue Feb 28, 2012 3:39 am    Post subject: Minimoog and the tis97 transistor Reply with quote  Mark this post and the followings unread

What is a direct drop in replacement for the TIS97 transistor within a MiniMoog? Or is there a cheap place to buy them?
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chguigoz



Joined: Mar 02, 2012
Posts: 13
Location: lille france

PostPosted: Fri Mar 02, 2012 10:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi. You can use 2N3904 as direct replacement.
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delayed



Joined: Jun 24, 2008
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PostPosted: Sat Mar 03, 2012 12:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Is there a reason the service manual only states one of the "tis" transistors to be a direct replacement with the 3904?
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chguigoz



Joined: Mar 02, 2012
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PostPosted: Sat Mar 03, 2012 1:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Which?
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 49
Location: Australia

PostPosted: Mon Jan 14, 2013 7:04 am    Post subject: Reply with quote  Mark this post and the followings unread

The schematics state that:

2N3904 = TIS92
2N3906 = TIS93
BUT TIS97 = TIS97


MiniMoog VCF Transistors.GIF
 Description:
Here are the Pinouts of the transistors for reference in case you need to try a substitute.
 Filesize:  7.43 KB
 Viewed:  1657 Time(s)

MiniMoog VCF Transistors.GIF


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TheAncientOne



Joined: Dec 26, 2006
Posts: 146
Location: United Kingdom

PostPosted: Mon Jan 14, 2013 11:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Interesting.

If you got them from Fairchild, you got A max collector current, (Ic) of 500mA, and a max VCE of 40V. If you got them from microElectronics they specify Ic max of 200mA, but VCE of 60V.

Otherwise it's a high gain general purpose NPN with a fairly low capacitance, (1 - 4 pF).

I would be tempted to try a BC 547, (since I'm in Europe), and select one with a gain higher than 300, YMMV.

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Mike
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delayed



Joined: Jun 24, 2008
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PostPosted: Mon Jan 14, 2013 3:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

To take a shot at my own question, it might simply be the pinout?
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Gaetano_AU



Joined: Oct 08, 2011
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PostPosted: Mon Jan 14, 2013 3:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

From my datasheets I get VCE = 40v for both.
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