i really just need an exponential converter circuit. any links to circuits or how to set it up, such as which transistors will work and how to orient them.
tannerin
Posted: 6/4/2008 3:47:40 PM
The link I sent you, while maybe a bit "heady" does show how to configure an exponential amp (a.k.a. antilog amp).
Since you are dealing with lower frequencies, just about any 'ole transistor will work. 2N2222, 2N3904, etc. The link goes into a lot of detail about temperature compensation, etc. but I would just start with the simplest antilog amp and see how it goes.
Don
Since you are dealing with lower frequencies, just about any 'ole transistor will work. 2N2222, 2N3904, etc. The link goes into a lot of detail about temperature compensation, etc. but I would just start with the simplest antilog amp and see how it goes.
Don
Posted: 6/6/2008 2:51:10 PM
From: Eastleigh, Hampshire, U.K. ................................... Fred Mundell. ................................... Electronics Engineer. (Primarily Analogue) .. CV Synths 1974-1980 .. Theremin developer 2007 to present .. soon to be Developing / Trading as WaveCrafter.com . ...................................
Joined: 12/7/2007
National Semiconductor Application notes are a great source of data on analogue circuits..
National Application Notes] (http://www.national.com/appinfo/amps/0,2175,967,00.html)
AN-30 Log Converters (http://www.national.com/an/AN/AN-30.pdf)
AN-286 has "Exponential V/F converter for electronic music" AN-286 (http://www.national.com/an/AN/AN-286.pdf)
AN-311 Log Converters (http://www.national.com/an/AN/AN-311.pdf)
>> Edited 08/June/08 to add and refine links
National Application Notes] (http://www.national.com/appinfo/amps/0,2175,967,00.html)
AN-30 Log Converters (http://www.national.com/an/AN/AN-30.pdf)
AN-286 has "Exponential V/F converter for electronic music" AN-286 (http://www.national.com/an/AN/AN-286.pdf)
AN-311 Log Converters (http://www.national.com/an/AN/AN-311.pdf)
>> Edited 08/June/08 to add and refine links
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