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 Forum index » DIY Hardware and Software
TR-808 BD in LTSpice
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mxf



Joined: May 04, 2012
Posts: 2
Location: Germany

PostPosted: Fri May 04, 2012 5:19 am    Post subject: TR-808 BD in LTSpice
Subject description: won't oscillate
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Hello World!

Long time lurker, first time poster here.

I'm quite new to Spice and fail to simulate the bassdrum.

Like Eric Archers
clone, I'm using the substituted transistors and his trigger generator.

Did I make an obvious mistake?

Spice files available here: http://labs.qu.cx/_/bd808.zip

So long, Maik

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delta32



Joined: Nov 03, 2008
Posts: 6
Location: Oxford, UK

PostPosted: Sat May 05, 2012 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

What might be a problem is the 1m resistors being interpreted as 1 MilliOhm in stead of the desired 1 MegaOhm.

Try changing them in '1Meg'.
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mxf



Joined: May 04, 2012
Posts: 2
Location: Germany

PostPosted: Sun May 06, 2012 3:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah! What a glaringly obvious newbie mistake.

Yes, with "1Meg", it does behave more like a 808, i did however
input the resistors as "1M" and thought LTSpice would just do the right thing.

Thank you so much delta32, that cost me some nerves Smile
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kreeper_6



Joined: Jan 17, 2014
Posts: 1
Location: USA

PostPosted: Fri Jan 17, 2014 10:30 am    Post subject: Reply with quote  Mark this post and the followings unread

I'd like to thank you guys, I had the same problem on the exact 808 BD circuit and the solution was the "Meg" labeling.

Smile
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