/diy/ - Do It Yourself

>>1266639
So... Analog synth shit?
http://musicfromouterspace.com/ is a pretty well known resource.

>so far the results were... Less than stellar
What does this mean? Results were bleep bloop? That's normal.

>>1266639
I have some autism synth chips lying around. If I have a few extras I might be able to send you one or two. I'll look when I get home this evening and reply to this and your post if I gots any.

I dont remember what the chip is atm so don't ask. It's some chip that's probably straight outta the 90's.

>>1266654
Bookmarked. Thank you kind anon.

I tried to shape a white noise, but the noise was not particularly white. Madebme realize how little o know of this topic.

>>1266537
I don't know about that. Genuine Arduinos cost at least 20€, usually more, but I've been using Chinese ones for a tenth of that price for several years and haven't had any quality issues with them. Several have died, but that's because I've stupidly shortcircuited them, or pumped 24V into a 5V digital pin, stuff like that, never a problem that I didn't cause.

>>1266712
I mean in the context of other chink shit. For instance, if you saw some 25 cent arduino ripoffs, would you believe they work anything like the $2 ones? There's a level where the stuff is adequate and works, and then there's the level 80% below that where the shit doesn't even work right, in the case of the $5 multimeter anon had, versus the $25 aneng which by most accounts is adequate as long as you're not doing HV stuff.

>>1266656
>he has autism synth chips laying around
you could have made some bank with these a few years back, m8, but now a few of them have been reissued.

>>1266537
"sell on price, live on rice"

>>1266600
not that poster, but I do use one tip for both, could that be the cause of white crud on no-clean flux post-IPA?

>>1266600
I am the og poster and no its regular 63/37 tin lead.

I think the core type was listed as 3C or Crystal 400 but I'm not sure what that means.

>>1266639
>>1266656
these are the chips i was talking about. turns out i only have 1 of each of them. sry m8

>>1266751
these worth anything?

>>1266801
1358 might be good for a ring modulator (used in the ARP Avatar iirc)
76477 are pretty easy to find and not all that exciting by themselves, need DACs or pots/switches to drive it
that speech synth chipset is a rarity, could fetch maybe $25 on fleabay

Where can i buy a "tiny SMD fusible resistor"?

>>1266844
um, digikey?
https://www.digikey.com/products/en/resistors/chip-resistor-surface-mount/52?k=fusible%20resistor

>>1266844
Break your synthesizer?

What u should really do is start following YVNG._.Burberry

What did Forrest M. Mims III™ mean by this?

I need a circuit that uses one switch to activate model rocket igniters in sequence

i have no idea what kind of thing i should type into google

>>1266911
just use really, really long wires

Where do you guys get cheap electrical wire. 18-22 gauge. No place in my city sells it.

>>1266911
"sequential timer 555" seems like it'd be a fruitful search term

>>1266920
seems a bit complex considering that i don't have to worry about looping through the sequence, once the igniter fires it behaves as an open switch couldn't i just be creative with the wiring?

>>1266911
If you mean for each time you press a button you trigger the next motor (instead of >>1266920 triggering each motor after a delay after a single button is pressed) then use a shift register like pic related. Or use relays, I guess.

You'd better be making some sort of keyboard-controlled multi-stage rocket with KSP controls.

>>1266920
Couldn't you just use a few RC circuits with a single hex Schmitt inverter IC instead of a bunch of 555s or 556s?

>>1266931
>shift register
seems more like what I'm looking for

is there clock-less 1-Nth setup that i could daisy chain together?

>>1266939
Well you could daisy chain a few D flipflops together, but they come in DIP14 ICs anyway, so you'll actually just be wasting pin space and wire. The clock input is for the button pulse to go to, no oscillator required.

Just to confirm, you do want a single button to activate the next motor each time it's pressed, right?

>>1266914
chinkwire isn't bad

>>1266931
yeah you could. now that I know the timing is meant to be even, could also use a 74273 octal DFF (20-pin package), use the master clear as a safety inhibit, and just jumper each output to the next.

>>1266868
yes!

Picked up an Energy Concepts 30820B oscilloscope for cheap today, I'm trying to test it now. It takes BNC probes but I don't have any. I'd like to see if I can get a response out of it before I go and buy a pair, so I'm trying to give it a signal using alligator clips. I'm assuming the live part would be the outer barrel, but I'm not getting any response. Does there tend to be something special with the center pin on these?

>>1266981
>I'm assuming the live part would be the outer barrel.

No. Outer barrel is ground. Inner section is signal. I've been too lazy to find a probe and jammed a wire in there a few times. Works OK if you don't mind looking at a noisy signal.

>>1266639
Sine-wave oscillators: either using a rotation matrix or d^2x/dt^2=-w^2*x. But on a PC, you can just use sin(); the other techniques are more relevant for uCs or dedicated silicon.

Filtering square waves; this is the basis of the Clavioline and derivatives.

>>1266981
Make your own probes

>>1266981
Just get some BNC cables you'll need them eventually as most pieces of test equipment use them unless you're doing RF work then you'll usually see type N and SMA connectors.

And no the outer barrel is not live. Almost all instrument grade cables are shielded cables and as such the out sleeve is grounded. Signal goes on the center pin.

Retarded question time:
I want to replace a mechanical push button on a chip with an arduino. The button works by grounding a pin.
Can I use a digital pin, give a "high" signal to the pin and "LOW" to simulate a button press? Or do I need to use transistors?
(I'd run a dfplayer mini at 5V and the digital pins at 5V high. )

>>1267045
Maybe, but if you play with AVR's pin direction register, you can achieve the open/grounded action too.

>>1267045
>button on a chip
Never seen such a chip. Of course you can use any pull-down method you want, including a digital port or a transistor. The question is what initiates the button pushing. If you want to yell *PUSH* you need a microphone and some electronics, but it'll work.

>>1267051
Now I'm retarded but not that retarded(or so I hope). I meant a normal push button is connected to a pin and ground. Essentially it grounds the pin when actuated. I want to automate that via digital means, so I can tell the arduino to set pin x to high and it simulates a button press

>>1267053
I think the DFplayer has built-in pull-up resistors, so you need _not_ supply a HIGH signal, only LOW to activate the function you want. I guess it will not damage anything if you do though. A typical pull-down button is like an open collector or open drain output which means you only sink and never source current. Be aware that the duration of 'pushing the button' is evaluated. Short means 'next', long means 'volume up' or 'prev' and 'vol down', see pic.

Can anyone point me to a moderately priced hot air reflow station. I just got chinked by the most recent $80 one I bought.

>>1267071
Yeah, LOW would equal as ground, so it counts as an actuation, but when I do not actuate the button do I send HIGH as idle state or do I disable the digital pin? If so by setting it as non output?

>>1267087
I would keep HIGH as idle state and use a diode.

>>1267109
Okay, thanks!

>>1266946
>single button to activate the next motor each time it's pressed
ideally, but simplicity is foremost, if i can delay the launching of the next in sequence long enough to get 1 launch per button tap that'd be good enough.

>>1267272
Then a shift register is exactly what you want. How many stages/button pushes?

>>1267079
>moderately
>the most recent one I bought
More details. Where are you? What station did you just get chinked by? What are the limits of "moderate"?
About to order the Aoyue 888a from SRA, myself. It also includes a pencil iron.

>>1267315
6 possibly 7 depending on how it all comes together

>>1267079
get an npt threaded cartridge heater, some fittings, a hose, and an air pump :^)

>>1267379
sheeeeiiiit, I was worried you'd need like 30
a single CD4017 counter/decoder, some switch debounce circuitry, and igniter drivers would be enough for up to 9, and also would run fine off a single 12V supply.
(only one driver shown for clarity, duplicate as required)
(circuit completely untested but should work)

NEW THREAD

>>1267468
>>1267468
>>1267468

NEW THREAD

>>1267458
thanks

>>1267506
addendum: Vgs(on) should be > 4V not 5V

>>1262373
Roll

>>1267953
Re-roll

>>1262373
rollan