The result is a fast sweep at then beginning and a slow sweep at the end of the portamento effect. You can hear this effect at the beginning of Erasure’s Chorus. Many synths have this type of portamento but I don't like it. There are other electrical negative effects when the value of R is very high (R is a 1Mb potentiometer which change the portamento time), at this point the output voltage never riches the input voltage, I don't know why. Although, I suppose this is a defect of my design.
So, I decided to replace this circuit with one with linear response (ex
I want to replace the old circuit with the new one but in a fast and simple way, so I build a little daughter board that I placed in the dip socket of the old circuit buffers Op Amp (TL 082). With this I can back to the old circuit just taking of the daughter board and placed an OP Amp in the socket.
Another possibility of the new circuit is the asymmetrical portamento. A diode placed in parallel with the rate potentiometer produce the portamento effect when you play upping phrases and cancel the effect when you play down way phrases. The new circuit has this facility but I don't use it yet because I have to put a switch in the front panel.
1 comentario:
Very cool, sounds great!!
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