noise in general

[1878]

I'll be putting together an Atari Punk Console later on this evening, and I was wondering if there's any similar projects I can build ?? Just noise generators really, not too bothered about plugging anything into it.

Thanks in advance.

[birt]

this is a fun one: http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/YOUR_FIRST_SYNTH.html

[Krinor]

Well, you could try an optical theremin. Great little toy and very easy to make too. 

http://www.oldtemecula.com/theremin/rs-opticaltheremin/rs-opticaltheremin.htm

[ambulancevoice]

dont get me started
im the resisdent noise freak here!!!
in a way...
there is a bunch on this site
http://www.geocities.com/worthekik/diy.html
scroll down to noisemakers

[1878]

I like the optical theremin idea !! Could I add a volume control to it ?? If I can, where and what value would you suggest ?? Also, would any type of 555 be suitable ??

Thanks again.

[birt]

the one in the link i posted can be built with LDR's replacing the pots. i have done that before.

[ambulancevoice]

I like the optical theremin idea !! Could I add a volume control to it ?? If I can, where and what value would you suggest ?? Also, would any type of 555 be suitable ??

Thanks again.

yeah, any stable 555 would be good
and yeah, jsut try a 100ka pot at the output (wired just like a regular volume pot)
if the 100ka doesnt work, try 1M or 10k

[smnm]

This is a great simple drone/noise maker, a lot more use than the APC IMO:



with a power starve control it gets even better!

see http://experimentalistsanonymous.com/board/viewtopic.php?t=382

[1878]

I'd like to put a couple of these things into one enclosure. Can I run them all off one DC 9v jack ?? If so, what would be the best (and safest !!) way of achieving this ??

Thanks again.

[ambulancevoice]

I'd like to put a couple of these things into one enclosure. Can I run them all off one DC 9v jack ?? If so, what would be the best (and safest !!) way of achieving this ??

Thanks again.

of course, 9v dc jack on both wont kill you!!
just like this

[1878]

Oh yeah...

I'm still really a beginner at this. The parts list is:

1 x 40106
5 x 50k pot
2 x 1uf electrolytic

I see you've added a 100uf electrolytic. Would I attach that to the ground lug of the DC jack itself ?? Also, are the pots lin or log ??

Thanks again.

[ambulancevoice]

Oh yeah...

I'm still really a beginner at this. The parts list is:

1 x 40106
5 x 50k pot
2 x 1uf electrolytic

I see you've added a 100uf electrolytic. Would I attach that to the ground lug of the DC jack itself ?? Also, are the pots lin or log ??

Thanks again.

pots are lin, 100uf electro may not be entirely necessary if your using a regulated power supply, its merely for extra filtering, and to give the ic a smoother supply if your wall wart or whatever is unregulated
and yes, you can attach the positive lead to the positive lug on the dc jack, and the negative lead on the negative lug, works fine

[darron]

dont get me started
im the resisdent noise freak here!!!
in a way...
there is a bunch on this site
http://www.geocities.com/worthekik/diy.html
scroll down to noisemakers

is the Analog Bit Crusher on that page an actual sample and hold, or does it sort of just work as a very fast muting square wave effect?

he links to a schematic here: http://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Analog%20Bit%20Crusher.gif

i've always wanted a bit crusher... maybe i'd just make one with a jfet and two transistros doing the work of the bottom dual opamp. it's fantastic that there's so much in the community to show you how to do something like that.

[ambulancevoice]

dont get me started
im the resisdent noise freak here!!!
in a way...
there is a bunch on this site
http://www.geocities.com/worthekik/diy.html
scroll down to noisemakers

is the Analog Bit Crusher on that page an actual sample and hold, or does it sort of just work as a very fast muting square wave effect?

he links to a schematic here: http://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Analog%20Bit%20Crusher.gif

i've always wanted a bit crusher... maybe i'd just make one with a jfet and two transistros doing the work of the bottom dual opamp. it's fantastic that there's so much in the community to show you how to do something like that.

i think you got the wrong idea of what a bit crusher does
it reduces the bit rate of the input signal, so it sounds like 8 bit video games or worse...

[darron]

i think you got the wrong idea of what a bit crusher does
it reduces the bit rate of the input signal, so it sounds like 8 bit video games or worse...

yeah, yeah. i know. to make it sound like an atari sort of. so the principle would be that you take samples of the signal at much lower frequencies. so if you had a sine wave it would have square notches all over it. but from looking at the schematic it sort of looks like it would just mute the signal really quickly. with my limited knowledge of jfets etc. i was wondering if this effect actually does make the jfet 'sample and hold' as it claims to make a true bit crusher effect, or does it sort of just sound similar? i just don't understand how/if that part of the schematic works that way. i understand the bufffers though and how the dual opamp at the bottom makes the waveform.

thanks (:

[1878]

Oh yeah. If the 'standard' way of numbering pot lugs applies (1-2-3 looking from the bottom with the lugs pointing up) are the pots on the left side of the diagram wired using lugs 2 & 3, whilst the pots on the right side are wired using lugs 1 & 2 ?? And if so, what about the pot at the bottom of the diagram ??

The schematic is here:

http://experimentalistsanonymous.com/board/viewtopic.php?t=382

Needless to say, it only added to my general confusion

Thanks again.

[ambulancevoice]

on the schematic here, it says what pins are wired

[1878]

Can I get away with using 47k lin pots ?? What's the margin of error when you can't get the exact value ??

Thanks again.

[ambulancevoice]

Can I get away with using 47k lin pots ?? What's the margin of error when you can't get the exact value ??

Thanks again.

well, they will work, but you wont get the max range i think
so, you can get 47k pots but not 50K? wtf?

[1878]

I can get both but I'll have to wait for the 50k's to be delivered. Impatience.