I've been trying to build the noise toaster from "make: analog synthesaizers" and it has a very similar envelope generator to the one you show here. I've been wondering what is the role of Q10 here? Why is it needed? Could we not just apply BP to the capacitor with S10 only? I trid removing R62, R57, R61 and Q10 so manual gate S10 was a direct connection from BP to the junction of diodes and my envelope generator seemed to work the same.
That's because it is the Noise Toaster Env. Gen! Hahaha. That's a good question! And unfortunately probably only one that Ray himself would be qualified to answer, but he passed in 2016, so there are many questions that myself and I'm sure plenty of others are left with! I never personally experimented with removing any of the components, but I have a feeling the transistor and associated components is to offer some more linear switching and charging of the cap, whereas the switch by itself could be a bit noisy with switch bounce. That's only my amateur educated guess, if anyone else reads this and has a more concise answer - fire away!
Also to probably offer a bit of current limiting as well! 12V directly from the switch could create some spurious behavior from the EG (Or worse, magic smoke!).
@@sebbothebushnerd Thank you for the answer! I'm also having trouble setting up the repeat mode. If i set the switch to manual the AREG works as intended so i'm guessing the problem is in my op-amp. Am i understanding this right that the voltage on the source pin of Q9 should be the same as the voltage on the capacitor? I'm trying to find where my envelope generator stops working, since every time i set S8 to manual the output of my op-amp jumps to high saturation and stays there instead of switching between high and low.
Hmmm, maybe check where your positive feedback resistor is going. A comparator sticking in one state can usually be attributed to this. Otherwise, starting again can sometimes be the most effective method! Hahaha. It's not a massive circuit, so just check every connection one by one and you should hopefully find the issue!
I recommend picking up a couple of intro to electronics books! My personal suggestion is Make: Electronics & More Electronics by Charles Platt. Goes through the absolute basics, building up a bigger picture chapter by chapter 😁
Timing index:
0:00 - 1:22 Intro
1:22 - 2:38 LFO Intro
2:39 - 4:30 LFO Patch
4:31 - 7:13 How SlowFO can you go?
7:14 - 8:54 LFO Sync
8:55 - 12:37 LFO Circuit
12:38 - 13:07 Envelope Generator Intro
13:08 - 15:29 ADSR Envelope
15:30 - 17:14 G8's M8
17:15 - 21:03 Envelope Generator Patch
21:04 - 25:39 Envelope Generator Circuit
25:40 - 25:53 Outro
Beautyful vid 😁
Great video!
Thanks John! 😁
I've been trying to build the noise toaster from "make: analog synthesaizers" and it has a very similar envelope generator to the one you show here. I've been wondering what is the role of Q10 here? Why is it needed? Could we not just apply BP to the capacitor with S10 only? I trid removing R62, R57, R61 and Q10 so manual gate S10 was a direct connection from BP to the junction of diodes and my envelope generator seemed to work the same.
That's because it is the Noise Toaster Env. Gen! Hahaha. That's a good question! And unfortunately probably only one that Ray himself would be qualified to answer, but he passed in 2016, so there are many questions that myself and I'm sure plenty of others are left with!
I never personally experimented with removing any of the components, but I have a feeling the transistor and associated components is to offer some more linear switching and charging of the cap, whereas the switch by itself could be a bit noisy with switch bounce.
That's only my amateur educated guess, if anyone else reads this and has a more concise answer - fire away!
Also to probably offer a bit of current limiting as well! 12V directly from the switch could create some spurious behavior from the EG (Or worse, magic smoke!).
@@sebbothebushnerd Thank you for the answer! I'm also having trouble setting up the repeat mode. If i set the switch to manual the AREG works as intended so i'm guessing the problem is in my op-amp. Am i understanding this right that the voltage on the source pin of Q9 should be the same as the voltage on the capacitor? I'm trying to find where my envelope generator stops working, since every time i set S8 to manual the output of my op-amp jumps to high saturation and stays there instead of switching between high and low.
Hmmm, maybe check where your positive feedback resistor is going. A comparator sticking in one state can usually be attributed to this.
Otherwise, starting again can sometimes be the most effective method! Hahaha.
It's not a massive circuit, so just check every connection one by one and you should hopefully find the issue!
Another good video, its too bad I don't know enough to watch the whole thing.
Thankyou! Yeah, there can be a bit to take in! I've done my best to keep it fairly straightforward hahaha.
@@sebbothebushnerd I can’t even follow a circuit diagram. Need to figure that one out
I recommend picking up a couple of intro to electronics books!
My personal suggestion is Make: Electronics & More Electronics by Charles Platt.
Goes through the absolute basics, building up a bigger picture chapter by chapter 😁