Antwort: [sdiy] push button CV wanted

[Christian.Bergmiller at daimlerchrysler.com]

You could use two pushbuttons that connect V+ or V- via a resistor (try
1MOhm) (put the resistor between supply voltage and the push button!)
to a cap (try 10uF). Then use an fet opamp to provide an voltage output
that does not load the cap.
as noticed before - dpdt switches can be used for "interlocking"

el cheapo version :-)

Christian



                                                                                                                                             
                      rtellason at blazenet.net                                                                                                 
                      Gesendet von:                  An:      synth-diy at dropmix.xs4all.nl                                                    
                      owner-synth-diy at dropmi         Kopie:                                                                                  
                      x.xs4all.nl                    Thema:   [sdiy] push button CV wanted                                                   
                                                                                                                                             
                                                                                                                                             
                      19.05.2004 19:26                                                                                                       
                                                                                                                                             
                                                                                                                                             




I have an application in mind for which I'd like the user interface to be a

couple of push buttons,  one that would raise and the other one of which
would lower a control voltage.  Ideally,  some sort of interlocking would
make it do nothing if both buttons were pressed at the same time.  Any of
you
folks know of a circuit that'll do this?  Or have any ideas as to how it
might be implemented?