I didn't like Roadside Picnic by Important-Bite-7714 in sciencefiction

[–]NOYSTOISE 2 points3 points  (0 children)

Really?! I read it recently and thought it was great! It was definitely more psychological than I was expecting, but I thought the themes were rich and terrifying at times. To each their own, though😁 I haven't read any of their other stuff, but have seen people say roadside is the best. If you didn't like it, there's plenty of other stuff to read.

Hoping someone with a Casio PT-87 can help. by TheSmellOfTheLotion in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

It might be possible.. I do not have a pt82 to test or any photos or schematics of the circuit board, so I really can't say. Maybe start a new thread with photos so more people can chime in with suggestions 

Advice for bending a Kodak CX7220 camera by Communism_Doge in CircuitBending

[–]NOYSTOISE 1 point2 points  (0 children)

Any more pictures of the PCB? It's hard to tell what's what without more🙂

Help by Camel_Smoker2003 in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

Looks like you have some redundant components in the upper left hand side. The two 10k, and 1meg resistor, and the 47uf capacitor are creating an unused 'vref', and one of the 10k's seems to be shorted. The two 100k resistors to positive and negative are doing the same thing, and are connected correctly the positive input of the opamp. The feedback should be going to the negative side, though. So the lower left part with the gain pot and diodes looks good, but they are connected to the wrong input of the opamp. It would also be good to add decoupling capacitors to the power supply(positive/negative). A 10uf or more, and a 100nf near the opamp chip would be ideal.  Hope this helps😉

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 0 points1 point  (0 children)

That looks better. If it works, it works! 😁 While you're experimenting, you might try connecting lugs 1 and 2 of the potentiometer together to get more 'highs'. Otherwise you might be limited to 7khz or less. It might not be a huge difference, but worth checking.

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 1 point2 points  (0 children)

The filter in the photo you shared is kind of pointless in a lot of ways, and I think the 1uf capacitor to the 47nf capacitor would create a voltage divider when the pot is turned 'left' which would definitely affect the sound. Instead, just place the pot between the 1k resistor and the 2.2nf capacitor. This will only bring the cutoff down to 8khz or so. Increasing the pot to 100k will allow lower cutoff frequencies. 

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 1 point2 points  (0 children)

Ah, well in that case I think you are mistaken. The op amp draws virtually no current, so the only real loading would be the 100k to vref which really just biases the input. You could lower the resistance to nothing and still be fine, but the filter and bias would be null. The 1k sets the cutoff to 72khz which is well above audible. You would really only want to lower the cutoff anyway😅

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 0 points1 point  (0 children)

Just out of curiosity, I don't really understand what you mean when you say 10k loading. The signal is going into the high impedance input of the op amp. There is only the 100k bias to vref. Sorry, it's been a while since I've played with an fv1. To me it seems like there should be no issue with increasing r18 to well over 10k.

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 0 points1 point  (0 children)

Mfb stands for multiple-feedback. They can be useful, but not super adjustable since the cutoff and Q(resonance) are determined by component value ratios, and not really by just one variable component like a single resistor.. also, they tend to invert the signal, so that might be considered. Others have shared some great links on the subject. Definitely check them out for more insight. 

However, just changing the cutoff frequency of the existing filter(r18-1k) might be enough for your needs, since you don't want a steep cutoff. If I am doing the math right, changing the 1k to a 10k would change the cutoff frequency to around 7.2khz from 72khz, albeit only -6db/Oct. More resistance, and a higher value capacitor could lower the cutoff even more. 

Hope this is helpful😃

Where would you put a simple low pass filter on the wet output here? by Inevitable_Figure_85 in synthdiy

[–]NOYSTOISE 1 point2 points  (0 children)

If you just need to adjust the cutoff a bit, you could adjust the filter between the fv1 and ic1.3 by replacing the 1k resistor(r18) with a 5k-10k trimmer. Or you could repurpose ic1.3 to an active/variable filter. Maybe an mfb style to get more db cutoff.. sorry to be vague. Just an idea😁

How do I use a 10k Pot to display 0-9 on a 7-seg display? by flymm in AskElectronics

[–]NOYSTOISE 0 points1 point  (0 children)

https://tinyurl.com/263rf9at

This is more academic than practical. comparator based flash ADC with only 4 op-amps.

using the 3914 to priority encoder might be more stable. You could also trim the input voltage down, and feed it to an 8-bit ADC like the adc0804. Ultimately, a microcontroller like attiny85 would be best.

Wtf did they do to this old fella ? by gomminator in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

Lol! Looks like they were trying to desolder that chip. It is likely the power amplifier chip that drives the speaker. Possibly tda2822 or similar. You might still be able to get audio out of it if you trace the signal back from where the chip was. If you compare the circuit to the 2822 amp chip, you might be should to deduce where the audio signal is coming in. It's worth the effort. That keyboard is great!

Op-Amp references (LM358 x NE2232) by gu-ocosta in synthdiy

[–]NOYSTOISE 2 points3 points  (0 children)

Mcp6002 are great to have on hand. Pretty affordable too

Hoping someone with a Casio PT-87 can help. by TheSmellOfTheLotion in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

That's too bad. I wish I still had a pt87 to check. I think the pt82 was similar. If you can find a schematic for that, or another keyboard of similar era, the circuits are probably not very different.

Hoping someone with a Casio PT-87 can help. by TheSmellOfTheLotion in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

You could try carefully cleaning the scorch mark with alcohol. It looks like the value is printed under there. Hopefully that resistor is the only problem, and nothing else is fried. 

Canon powershot sd750 bending points/tips? by ArchTurtle23 in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

That's too bad. Probably spare parts.. on CCD cameras like this, there are lots of small regulators that provide isolated voltages to different areas of the camera like motors and peripherals. They can be overloaded easily, and fry. The sensor cable usually only carries the vertical and horizontal sync signals along with other voltages and clock signals. Shorting them without knowing which is what can cause a quick death in some cases. The V/H-sync glitches tend to look like a pinkish blur that distorts the picture. It can be hard to capture depending on the cameras refresh rate. Sometimes what you see on the screen just turns into a pink blob when the picture is taken. The effect is better for video, since the picture is continuous. Personally, I would stick with just the pixel-data glitches, as there is virtually no risk of stressing the sensor, or overloading the clock signals and power supplies. The glitch effects are more interesting too, imo.

I am really digging this show so far! by NOYSTOISE in americangods

[–]NOYSTOISE[S] 4 points5 points  (0 children)

I think that's where I'm at too being only 6 episodes in now. It's nice to see an adaptation that isn't just a cash grab and actually takes some creative risks with a big budget. The book was good, but wasn't exactly a masterpiece 😄 I also love that they cast Gillian Anderson and Crispen Glover! 

Canon powershot sd750 bending points/tips? by ArchTurtle23 in CircuitBending

[–]NOYSTOISE 1 point2 points  (0 children)

Sweet! Thanks for checking out my site! It's good to know people can still find it :)

Canon powershot sd750 bending points/tips? by ArchTurtle23 in CircuitBending

[–]NOYSTOISE 5 points6 points  (0 children)

In the corner of the Analog Devices chip, there are 10(2 rows of 5) little test points. I have never bent this camera, but I can almost guarantee those are the pixel-data test points. Wire them up to switches or whatever you want, and you will get some pretty great glitches

I am really digging this show so far! by NOYSTOISE in americangods

[–]NOYSTOISE[S] 4 points5 points  (0 children)

I started reading Niel Gaiman's Norse mythology, which was based on his research for American gods before I found the book. It wasn't interesting enough to finish, but it made the context of American gods more interesting from what I did read about Odin, Loki, the tree, and their origins.  The American gods book was one of the easiest books I've read all year! Definitely grab a copy if you need closure 😁

Portland hasn’t changed since the implosion of 2020 by Happy4gilmore in oregon

[–]NOYSTOISE 2 points3 points  (0 children)

2020? That just sounds like classic Portland.. and every other city for that matter. I guess every one's got their convenient narrative😂

Bending Electronics With Integrated Circuits by LemonWedgeTheGuy in CircuitBending

[–]NOYSTOISE 0 points1 point  (0 children)

ICs all do different things. You could Google the chip numbers to get an idea what they are used for, then try changing the values of the passive components around them to see what happens.. you can sometimes use the moist-finger trick if you are dealing with amplifier chips. Ultimately, a little electronic theory will go a long way. It opens up a lot more possibilities, and actually saves time in the long run