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 Forum index » DIY Hardware and Software » Thomas Henry designs
Bass++ capacitor question
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flagada



Joined: Dec 15, 2016
Posts: 31
Location: Amsterdam

PostPosted: Sun Jan 26, 2020 5:16 am    Post subject: Bass++ capacitor question Reply with quote  Mark this post and the followings unread

Hi all,
I am building the TH Bass++ and I discovered an error. The BOM says that C8 is a 0,1uF capacitor but in the schematic C8 is a 0,01 capacitor. Which one should I use?

Another question: the BOM says that C1,C2, C7,C8,C9 an C10 should be mylar capacitors. How crucial is this? Does it really make a difference for the sound? For instance, C1 accepts the trigger, I would suppose that another type of capacitor would not make any difference.

I don't have these values in mylar, but I do have them in MKT and/or multilayer ceramic. Is it OK to use these?
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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
Audio files: 243
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PostPosted: Sun Jan 26, 2020 5:59 am    Post subject: Reply with quote  Mark this post and the followings unread

A link to a schematic would be helpful here :-)
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Jan
also .. could someone please turn down the thermostat a bit.
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flagada



Joined: Dec 15, 2016
Posts: 31
Location: Amsterdam

PostPosted: Sun Jan 26, 2020 6:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Circuit can be found here: (sorry you have to bend your neck Smile )
https://www.birthofasynth.com/Thomas_Henry/pdf/Bass_Plus/basspp_schematic.pdf
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Blue Hell
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Joined: Apr 03, 2004
Posts: 23018
Location: The Netherlands, Enschede
Audio files: 243
G2 patch files: 319

PostPosted: Sun Jan 26, 2020 7:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the link, an heh, no need for gymnastics, my viewers (os x preview app, windows Sumatra PDF viewer) have the bend option instead :-)

C8 just determines how long the LEDwill pulse after a trigger - so you can change it's value to your likings. I'd start with the larger value and only when that results in the LED being on always change it for a smaller valued one.

With the exception of C2 I see no need for anything special for the capacitors, but then again mylar is nothing too special anyway .. so maybe use no ceramic one for C2.

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Jan
also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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flagada



Joined: Dec 15, 2016
Posts: 31
Location: Amsterdam

PostPosted: Sun Jan 26, 2020 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Blue Hell, I happen to have a high quality (WIMA) 4,7nf capacitor so I will use that one for C2. For the others I'll take multilayer ceramic. Thanks!
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