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Binary counter question
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jurekprzezdziecki



Joined: Mar 22, 2016
Posts: 68
Location: warsaw

PostPosted: Mon Aug 22, 2016 12:54 am    Post subject: Binary counter question Reply with quote  Mark this post and the followings unread

hi guys,

i have mad some simple experiment and built a VCO circuit based on 7440 TTL ic. there is nice, stable square wave but a voltage control is rather weak.
so i have an ide to get 12 different frequencies / pitches from one source - te one 7440 vco.

i think to use a binary counter for that. something like 7490.

could you help me to design it?


CEMI 7440 OSC.png
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piedwagtail



Joined: Apr 15, 2006
Posts: 297
Location: shoreditch
Audio files: 3

PostPosted: Sun Aug 28, 2016 6:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Suggest you do research in the Lunetta sub forum on this site and grab a copy of The TTL Cookbook or CMOS Cookbook by Don Lancaster, which are well written texts on such matters.

R
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jurekprzezdziecki



Joined: Mar 22, 2016
Posts: 68
Location: warsaw

PostPosted: Mon Aug 29, 2016 12:11 am    Post subject: Reply with quote  Mark this post and the followings unread

this is good idea, thanks. i will look in these books as well.
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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
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PostPosted: Mon Aug 29, 2016 12:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Rule number 1: never ever leave an input floating!
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jurekprzezdziecki



Joined: Mar 22, 2016
Posts: 68
Location: warsaw

PostPosted: Mon Aug 29, 2016 12:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Grumble wrote:
Rule number 1: never ever leave an input floating!


yes i know:) it needs to be terminated with (+5V) right?

ps. i have a big collection of a vintage, polish TTLs that i want to use in a diy. it's inheritance from my father. could be fun:)
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