Search found 63 matches

I'd suggest that you publish what you want to, as people here are able to cross verify what you publish with what else we know. I've been a proponent of overrating power supplies for a while, but ther ...

how 'bout something based off this?
If you are happy about having a 'grid' type of pattern for your fingers to make contacts across, then there is an even simpler way (though the schematic you show s ...

Usually transformers have a VA or W rating (Volt-Amperes or Watts) and as one should know; Watts = V x I so if your transformer transforms 220V to 22V and you require 0.5A (500mA) then 22 x 0.5 = 11 s ...

I will be buying the components for a new dual polarity, mains powered linear PSU within the next few days, once a few other details have come to pass. This will be for my synth experiments.

Despit ...

I'm planning on 'modularizing' my Monotron, which should allow me to use it as separate modules (VCO, LFO, VCF, headphone amp). This will require external components for buffering etc., and a few reve ...

Well, the problem is you seem to have two problems at once. The first one is that your useful range is only about 1/5th of the full scale of the pot.

Swapping the resistor location only changes whi ...

Yes, had missed the part about not having a ground connection.

However remember that the pot+resistor isn't a symmetric combination, even if the pot alone is. Moving the resistor should make a diff ...

The trick does work, though sometimes the external resistances in the connecting circuits distorts the log/anti-log curves somewhat.

Also, it sometimes gets confusing with what type of curve you ne ...

It seems to me you are jealous of the people who are already in the center of the DIY synth world, and you want to be part of that world without earning your place via the traditional path of contribu ...

I believe that you have to walk the walk, live the life, be the example, before you can expect others to adhere to any expectations. Ms. Rand couldn't live up to her own standards...
That is actuall ...

Okay, think I have done a fair amount of digging in the archives by now, and as far as I can see, then what I am trying to say has not really been discussed in this way before. Given the reactions in ...

Another little FYI, now the thread is alive anyway:

Earlier in the thread it was suggested I might not have done my homework before posting. Currently I am trying to make sure that I am indeed not ...

With studio equipment, aside from using a star ground configuration, I guess they get around this by using balanced lines and/or isolation transformers to connect various pieces of equipment?
In man ...

Looks great, love the unconventional thinking involved.

If some day you do decide you need a more suitable op-amp for a 5V design, then a LM324 should do nicely for most functions. Has about the sa ...

Sorry dude, at least with me, you're not winning points with phrases like that. (The forum says you're in Denmark, but I don't know your country and/or language of origin. You seem to have a good gr ...

Sorry about the belated reply, am finally back from my Christmas holiday. I'm a bit tired right now, so will read through the whole thread again very soon, hopefully tomorrow, then write a more thorou ...

-->> Edit: urban legend that you can have copyright on schematics and printed circuit board layouts. Let me be blunt about this: You can't, regardless of any text you put on them.

Anyone wish ...

I am using a virtual ground on the TL071. I know it's not the best method, but it is getting the job done for now.
The virtual ground is fine, that isn't the issue. The problem is that a TL071 cannot ...

Some random suggestions:

*) Replace U4, the TL071, with a TLC271 or a similar, single supply op-amp. Feed U4 pin 3 from a voltage divider, made from 100K connected to +5V, and 56K connected to grou ...

Looks like a fun circuit. Smile

I'd suggest adding something like a 470-560 ohm resistor, or a bit larger perhaps, in series with all the 50K potentiometers. Doing this will limit the output current ...

I say zap the blasted chip in the name of weird science!I concur. More mad science FTW! After all, these chips are cheap as ... well ... chips, really. dalek

Just wanted to mention it, as the OP ...

One thing to keep in mind with these simple noise making oscillators, is that they are likely to be bad for the health of your CMOS chips. Sad

If you have a floating input, the chip is likely to be ...

I think nothing beats "
You are wrong, unfortunately. Shocked

(...) the animal life in general pretty much went into a state of shock when the cans were opened.. but the fish loved the stuff. (...)
Say, do you people ever 'test' that ... stuff on innocent touri ...

Yes, there is a shortage of butter, but not at all truly critical.
Of course not. It would be silly to suggest a highly developed country like Norway could have such a trivial problem. The prices I h ...

Author	Message
Topic: Would you like to see an AC mains DIY PSU design tutorial?
MadScientist Replies: 32 Views: 10012	Posted: Sat Jan 14, 2012 11:28 pm Subject: Would you like to see an AC mains DIY PSU design tutorial? Forum: DIY Hardware and Software
MadScientist Replies: 32 Views: 10012	I'd suggest that you publish what you want to, as people here are able to cross verify what you publish with what else we know. I've been a proponent of overrating power supplies for a while, but ther ...
Topic: simple touch keyboards
MadScientist Replies: 8 Views: 3650	Posted: Sat Jan 07, 2012 4:42 am Subject: simple touch keyboards Forum: DIY Hardware and Software
MadScientist Replies: 8 Views: 3650	how 'bout something based off this? If you are happy about having a 'grid' type of pattern for your fingers to make contacts across, then there is an even simpler way (though the schematic you show s ...
Topic: Would you like to see an AC mains DIY PSU design tutorial?
MadScientist Replies: 32 Views: 10012	Posted: Tue Jan 03, 2012 11:07 am Subject: Would you like to see an AC mains DIY PSU design tutorial? Forum: DIY Hardware and Software
MadScientist Replies: 32 Views: 10012	Usually transformers have a VA or W rating (Volt-Amperes or Watts) and as one should know; Watts = V x I so if your transformer transforms 220V to 22V and you require 0.5A (500mA) then 22 x 0.5 = 11 s ...
Topic: Would you like to see an AC mains DIY PSU design tutorial?
MadScientist Replies: 32 Views: 10012	Posted: Tue Jan 03, 2012 9:31 am Subject: Would you like to see an AC mains DIY PSU design tutorial? Subject description: Will be designing a PSU for myself anyway, so... Forum: DIY Hardware and Software
MadScientist Replies: 32 Views: 10012	I will be buying the components for a new dual polarity, mains powered linear PSU within the next few days, once a few other details have come to pass. This will be for my synth experiments. Despit ...
Topic: Monotron mods
MadScientist Replies: 26 Views: 21831	Posted: Tue Jan 03, 2012 6:53 am Subject: Monotron mods Forum: DIY Hardware and Software » Circuit Bending
MadScientist Replies: 26 Views: 21831	I'm planning on 'modularizing' my Monotron, which should allow me to use it as separate modules (VCO, LFO, VCF, headphone amp). This will require external components for buffering etc., and a few reve ...
Topic: Changing law of pot wired as rheostat
MadScientist Replies: 19 Views: 6477	Posted: Mon Jan 02, 2012 2:49 pm Subject: Changing law of pot wired as rheostat Forum: DIY Hardware and Software
MadScientist Replies: 19 Views: 6477	Well, the problem is you seem to have two problems at once. The first one is that your useful range is only about 1/5th of the full scale of the pot. Swapping the resistor location only changes whi ...
Topic: Changing law of pot wired as rheostat
MadScientist Replies: 19 Views: 6477	Posted: Mon Jan 02, 2012 2:21 pm Subject: Changing law of pot wired as rheostat Forum: DIY Hardware and Software
MadScientist Replies: 19 Views: 6477	Yes, had missed the part about not having a ground connection. However remember that the pot+resistor isn't a symmetric combination, even if the pot alone is. Moving the resistor should make a diff ...
Topic: Changing law of pot wired as rheostat
MadScientist Replies: 19 Views: 6477	Posted: Mon Jan 02, 2012 8:25 am Subject: Changing law of pot wired as rheostat Forum: DIY Hardware and Software
MadScientist Replies: 19 Views: 6477	The trick does work, though sometimes the external resistances in the connecting circuits distorts the log/anti-log curves somewhat. Also, it sometimes gets confusing with what type of curve you ne ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Sun Jan 01, 2012 2:55 pm Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	It seems to me you are jealous of the people who are already in the center of the DIY synth world, and you want to be part of that world without earning your place via the traditional path of contribu ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Sun Jan 01, 2012 10:42 am Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	I believe that you have to walk the walk, live the life, be the example, before you can expect others to adhere to any expectations. Ms. Rand couldn't live up to her own standards... That is actuall ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Fri Dec 30, 2011 4:42 pm Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	Okay, think I have done a fair amount of digging in the archives by now, and as far as I can see, then what I am trying to say has not really been discussed in this way before. Given the reactions in ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Thu Dec 29, 2011 8:50 am Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	Another little FYI, now the thread is alive anyway: Earlier in the thread it was suggested I might not have done my homework before posting. Currently I am trying to make sure that I am indeed not ...
Topic: Ground loop issues-patching between cases
MadScientist Replies: 6 Views: 2320	Posted: Wed Dec 28, 2011 1:55 am Subject: Ground loop issues-patching between cases Forum: DIY Hardware and Software
MadScientist Replies: 6 Views: 2320	With studio equipment, aside from using a star ground configuration, I guess they get around this by using balanced lines and/or isolation transformers to connect various pieces of equipment? In man ...
Topic: Simple 2 Chip Drum Machine
MadScientist Replies: 42 Views: 70130	Posted: Wed Dec 28, 2011 1:30 am Subject: Simple 2 Chip Drum Machine Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 42 Views: 70130	Looks great, love the unconventional thinking involved. If some day you do decide you need a more suitable op-amp for a 5V design, then a LM324 should do nicely for most functions. Has about the sa ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Tue Dec 27, 2011 12:05 pm Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	Sorry dude, at least with me, you're not winning points with phrases like that. (The forum says you're in Denmark, but I don't know your country and/or language of origin. You seem to have a good gr ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Mon Dec 26, 2011 2:24 pm Subject: Time to puncture the schematics 'copyright' myth? Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	Sorry about the belated reply, am finally back from my Christmas holiday. I'm a bit tired right now, so will read through the whole thread again very soon, hopefully tomorrow, then write a more thorou ...
Topic: Time to puncture the schematics 'copyright' myth?
MadScientist Replies: 80 Views: 36705	Posted: Wed Dec 21, 2011 7:52 am Subject: Time to puncture the schematics 'copyright' myth? Subject description: (Suspect some won't even read to the bottom before replying...) Forum: DIY Hardware and Software
MadScientist Replies: 80 Views: 36705	-->> Edit: urban legend that you can have copyright on schematics and printed circuit board layouts. Let me be blunt about this: You can't, regardless of any text you put on them. Anyone wish ...
Topic: Simple 2 Chip Drum Machine
MadScientist Replies: 42 Views: 70130	Posted: Wed Dec 21, 2011 1:51 am Subject: Simple 2 Chip Drum Machine Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 42 Views: 70130	I am using a virtual ground on the TL071. I know it's not the best method, but it is getting the job done for now. The virtual ground is fine, that isn't the issue. The problem is that a TL071 cannot ...
Topic: Simple 2 Chip Drum Machine
MadScientist Replies: 42 Views: 70130	Posted: Mon Dec 19, 2011 2:53 pm Subject: Simple 2 Chip Drum Machine Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 42 Views: 70130	Some random suggestions: *) Replace U4, the TL071, with a TLC271 or a similar, single supply op-amp. Feed U4 pin 3 from a voltage divider, made from 100K connected to +5V, and 56K connected to grou ...
Topic: Simple 2 Chip Drum Machine
MadScientist Replies: 42 Views: 70130	Posted: Mon Dec 19, 2011 5:25 am Subject: Simple 2 Chip Drum Machine Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 42 Views: 70130	Looks like a fun circuit. I'd suggest adding something like a 470-560 ohm resistor, or a bit larger perhaps, in series with all the 50K potentiometers. Doing this will limit the output current ...
Topic: Antennae and Lunetta!?
MadScientist Replies: 8 Views: 4943	Posted: Sat Dec 17, 2011 10:34 am Subject: Antennae and Lunetta!? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 8 Views: 4943	I say zap the blasted chip in the name of weird science!I concur. More mad science FTW! After all, these chips are cheap as ... well ... chips, really. Just wanted to mention it, as the OP ...
Topic: Antennae and Lunetta!?
MadScientist Replies: 8 Views: 4943	Posted: Sat Dec 17, 2011 9:28 am Subject: Antennae and Lunetta!? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
MadScientist Replies: 8 Views: 4943	One thing to keep in mind with these simple noise making oscillators, is that they are likely to be bad for the health of your CMOS chips. If you have a floating input, the chip is likely to be ...
Topic: Why do you hate Christmas?
MadScientist Replies: 83 Views: 34340	Posted: Sat Dec 17, 2011 6:58 am Subject: Why do you hate Christmas? Forum: Discussion » Schmooze
MadScientist Replies: 83 Views: 34340	I think nothing beats " You are wrong, unfortunately.
Topic: Why do you hate Christmas?
MadScientist Replies: 83 Views: 34340	Posted: Sat Dec 17, 2011 6:46 am Subject: Why do you hate Christmas? Forum: Discussion » Schmooze
MadScientist Replies: 83 Views: 34340	(...) the animal life in general pretty much went into a state of shock when the cans were opened.. but the fish loved the stuff. (...) Say, do you people ever 'test' that ... stuff on innocent touri ...
Topic: Why do you hate Christmas?
MadScientist Replies: 83 Views: 34340	Posted: Fri Dec 16, 2011 5:15 pm Subject: Why do you hate Christmas? Forum: Discussion » Schmooze
MadScientist Replies: 83 Views: 34340	Yes, there is a shortage of butter, but not at all truly critical. Of course not. It would be silly to suggest a highly developed country like Norway could have such a trivial problem. The prices I h ...