Audio synthesizers use really creative ways of manipulating simple periodic waves with lots of opamps! I would really appreciate more of this content (or more RF black magic goodness :D )
Since we're talking analog synths, the other interesting thing about the circuit at 5:19 is the output frequency from the opamp is twice the input frequency. Would have been interesting to look at the harmonic output using the FFT function. Diodes are amazing, it's all too easy to take them for granted :)
That circuit in your paper is a base circuit of a one semiwave rectifier. When the input signal passes through zero the output would tend to go into saturation but when one diode start to conduct, wiĺl limit the output.
I wonder if the leakage at 4:00 is not through the diode but rather through the two 10K resistors. An easy way to find out would be to add a 20k load to the output and see if the positive sides cut exactly in half.
The reason for the second diode is to prevent the op-amp from going into an open-loop saturated condition. When the diode is reverse biased the voltage at the output swings widely (and when you have the load resistor all the way into saturation). The recovery from this takes time due to the Op amp slew rate and/or the recovery from being saturated at the rails. By putting the second diode you are killing the gain when the diode is reverse biased which avoids all of these problems. devtts0 has a good tutorial on this at ruclips.net/video/dCojRDwoFaI/видео.html
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Audio synthesizers use really creative ways of manipulating simple periodic waves with lots of opamps! I would really appreciate more of this content (or more RF black magic goodness :D )
Since we're talking analog synths, the other interesting thing about the circuit at 5:19 is the output frequency from the opamp is twice the input frequency. Would have been interesting to look at the harmonic output using the FFT function. Diodes are amazing, it's all too easy to take them for granted :)
That circuit in your paper is a base circuit of a one semiwave rectifier. When the input signal passes through zero the output would tend to go into saturation but when one diode start to conduct, wiĺl limit the output.
I think that it is to make it faster to start conducting again when the input signal switches polarity. Specifically if the opamp has a low slew rate.
exactly
I wonder if the leakage at 4:00 is not through the diode but rather through the two 10K resistors. An easy way to find out would be to add a 20k load to the output and see if the positive sides cut exactly in half.
That’s my understanding too.
The reason for the second diode is to prevent the op-amp from going into an open-loop saturated condition. When the diode is reverse biased the voltage at the output swings widely (and when you have the load resistor all the way into saturation). The recovery from this takes time due to the Op amp slew rate and/or the recovery from being saturated at the rails. By putting the second diode you are killing the gain when the diode is reverse biased which avoids all of these problems. devtts0 has a good tutorial on this at ruclips.net/video/dCojRDwoFaI/видео.html
So it's just creating different colours of noise? Being sound. Interesting. Thanks.
Wow wait! Did you get a fuil-wave rectifier when you dont load the circuit??? that is interesting!
Watch the video posted above by Ed Luke. That explains why there is rectification. In a nutshell just assume the diode isn't there ....
I'd be interested in seeing more of those diagrams that appeared around 6:28. Where did that come from?
You can find lots of nice circuits at: musicfromouterspace.com/
@@IMSAIGuy Wow thanks! I've just taken a quick look. That site will keep me occupied for hours!