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 Forum index » DIY Hardware and Software » Thomas Henry designs
TH 555 tempco replacement
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MapacheRaper



Joined: Feb 15, 2018
Posts: 102
Location: Spain

PostPosted: Wed Aug 29, 2018 10:38 am    Post subject: TH 555 tempco replacement Reply with quote  Mark this post and the followings unread

Hi,

Im building the 555 VCO with the foniks PCB and I haven´t found the 3500ppm 2k PTC

I have 2 1k 3000ppm PTC. Could I use it as a replacement?. Should I change some other resistor value to fit the different ppm?

I don´t really know get the mathematics involved. It´s ok if its only tracks 3 or 4 octaves instead of 5 or 6
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elmegil



Joined: Mar 20, 2012
Posts: 2053
Location: Chicago
Audio files: 16

PostPosted: Wed Aug 29, 2018 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Not really no. It would function, but your temperature coefficient would be off.


EDIT: Fonik says it would be OK, so never mind me Smile
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MapacheRaper



Joined: Feb 15, 2018
Posts: 102
Location: Spain

PostPosted: Wed Aug 29, 2018 3:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
Not really no. It would function, but your temperature coefficient would be off.


EDIT: Fonik says it would be OK, so never mind me Smile


Thanks anyway! Very Happy
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