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 Forum index » DIY Hardware and Software » fonik's place
Fonik's PCB for JH's WASP Filter clone
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Paradigm X



Joined: Feb 15, 2011
Posts: 281
Location: Null and void

PostPosted: Fri Nov 25, 2011 8:17 am    Post subject: Fonik's PCB for JH's WASP Filter clone
Subject description: BAT85 alternatives?)
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Hello all,

I am currently breadboarding the wasp filter clone (thanks for this!) and i just noticed that D4 and D5 are BAT85 schotkey diodes. I havent actually got any of those, can I replace them with standard 4148s or germaniums ?

Ive done a bit of googling and it seems to be down to speed, but im not totally sure so just thought id ask.

It says it for protection in the manual. maybe 4001/4004s then? Got some of those too.

Many thanks, Ben


edit... hmm, just spotted the JH schematic, theyre not implemented there.
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Nov 25, 2011 1:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

the schotkeys give protection, if you run the module on 5V, however, it will work with 12V or 15V without any changes.
i fyou fell you'd needed them, you could even use standard diodes, since the CMOS will have some tolerances.

i don't know abot the current schematic jürgen has up on his site, nevertheless, they were shown on an his older hand sketched schematic.

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Cynosure
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PostPosted: Fri Nov 25, 2011 5:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

I built two of these, but could only get 2 of the NTE substitutes for the BAT85. I ended up using the NTE ones on the first filter, and 4148's on the second.

It has held up ok so far, and I figure if all it is protecting is a 50cent CMOS chip then I can afford to replace it once in a while.
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Paradigm X



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PostPosted: Sat Nov 26, 2011 8:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks both.

I actually ended up needing to order some other parts so bought 6 of these anyway/

Fonik - i was looking at JH's schem on your site, but they are on there, youre right sorry, i missed them Embarassed

Cheers, Ben
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Nov 29, 2011 11:27 am    Post subject: Reply with quote  Mark this post and the followings unread

i changed the topic's headline, in order to make it clear: this is about jürgen's circuit, which i once made a press'n'peel blue PCB layout for...
Very Happy

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Paradigm X



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PostPosted: Tue Nov 29, 2011 12:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

No problem! thanks again.

Ive got the schottkey diodes today actually, so ill give it a go.

Thanks, Ben

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