Search found 559 matches

I don´t mind using an expo converter. I´m thinking about sound quality in general. Low noise and distortion are not that big deal in a synth application, but low slew rate and most of all feedthroug ...

propably great if you can handle 16 pin qsop. i can´t.

Hey thank you! Just what i was looking for.
It´s intersting how both the pos and neg controll ports are used.

Hi
Has anyone made some experiance with these THAT2180 VCAs?

http://www.thatcorp.com/2180-series_Pre-trimmed_Blackmer_IC_Voltage-Controlled_Amplifiers.html

They are made for pro audio stuff lik ...

No need to change any surounding circuitry? Same performance in the vco? I know what to do with the other half...

All these circuits are briliant. What is the reason thet the 3080 ota is seen so often?
Its hard to get/expensive. Would half a LM13700 work as well in circuits like the VCO1 or UD1?

Is it possible to implement sync on the vco 1?

Someone pointed out to me that this chip is actually not designed for audio. Noisy, slow and rather high distortion. Still i´ll see what i get out of it, maybe it gives the signal a pleasant edge...

I´ll keep you up to date. I have to orfer the switches first since i want to do a pcb containing all parts and switches. Wouldn´t want to hand wire 24 rotary switches for a stereo unit.
Maybe i can ...

I have a midibox cv and think its fantastic. You can build a very basic 1 or two output version, but 8cvs and 128 gate triggers are possible. It can be programmed to do almost anything with the midi d ...

Hi,
Heaven´t been here for a while, simply couse i didn´t have the time to build anything...
Well, i too have some of these chips and am thinking what to do with them. I once started a discussion, ...

timing constant (or filterfreq - also the same rc network)) is determined by a resistor and a cap. If you want very long release you can choose the biggest pot, like 10m. For attack you can use a smal ...

Isn´t it just the timing constant that defines the rise time? smaaler rc - faster attack. Nothing special or modern about that in my understanding. maybe more interesting what happens inbetween the s ...

btw, the panel looks great! nice design.

why is it using 3 4067?
not sure how much they can drive, but it sould be enough for 2ma LEDs and as many gates and cv pots as you want. Of course that needs diode decoupling.

and 2 for me as well.
thanks for your great work!

4 and 5 look best to me. More or less the same... And they use an precision rectifier (quite important for an compressor in my oppinion)
I would use 10k for the ouput amp although that´s no big diff ...

Whatever i say, these are only my observations. This is rather experiance than reall knowlege. Please correct me...
i have been experimenting with the 12sh1p. It needs 12V, but only very little curre ...

It is 100r in series with the pt1000. Makes 1k1. Then something in parallel to the whole thing to drop the resistance back to 1k.
Problem is that normal resistors vary in their tk, but i was told tha ...

great explanaition. i´ll have to read it again though with a little more time than right now. you´re talking about current flowing through the cap. i always thought since the two ends of the cap are ...

I once got told that 100R series and a parallal resistor (can´t remember exact value, so that it ends up at 1k) will lower the tk of the pt1000 to 3500.

what happens if you replace the resistor with a cap?

If you can´t get a 5672 i´m sure most tubes will work somehow in this circuit. raising the voltage to 30v (or +-15) might help if a tube sounds like it´s broken.

Those samples sound perfect! Love that 12v tube stuff. I´m triying to figure out how it works. WHat about C2 and C3? should be of same value, i guess? Can someone explein what the 130n-130k at the ga ...

well, you mentioned all i know. LFO frequency, depends on what that means. Generally the pll can´t look in the future, so it always takes some cycles to look in. But if the source is stable in speed ...

Author	Message
Topic: That VCA chips
zipzap Replies: 18 Views: 14340	Posted: Tue Dec 02, 2008 9:59 am Subject: That VCA chips Forum: DIY Hardware and Software
zipzap Replies: 18 Views: 14340	I don´t mind using an expo converter. I´m thinking about sound quality in general. Low noise and distortion are not that big deal in a synth application, but low slew rate and most of all feedthroug ...
Topic: That VCA chips
zipzap Replies: 18 Views: 14340	Posted: Tue Dec 02, 2008 4:45 am Subject: That VCA chips Forum: DIY Hardware and Software
zipzap Replies: 18 Views: 14340	propably great if you can handle 16 pin qsop. i can´t.
Topic: That VCA chips
zipzap Replies: 18 Views: 14340	Posted: Tue Dec 02, 2008 1:35 am Subject: That VCA chips Forum: DIY Hardware and Software
zipzap Replies: 18 Views: 14340	Hey thank you! Just what i was looking for. It´s intersting how both the pos and neg controll ports are used.
Topic: That VCA chips
zipzap Replies: 18 Views: 14340	Posted: Mon Dec 01, 2008 10:42 am Subject: That VCA chips Forum: DIY Hardware and Software
zipzap Replies: 18 Views: 14340	Hi Has anyone made some experiance with these THAT2180 VCAs? http://www.thatcorp.com/2180-series_Pre-trimmed_Blackmer_IC_Voltage-Controlled_Amplifiers.html They are made for pro audio stuff lik ...
Topic: why the 3080?
zipzap Replies: 7 Views: 11741	Posted: Sun Nov 30, 2008 2:29 am Subject: why the 3080? Forum: DIY Hardware and Software » Thomas Henry designs
zipzap Replies: 7 Views: 11741	No need to change any surounding circuitry? Same performance in the vco? I know what to do with the other half...
Topic: why the 3080?
zipzap Replies: 7 Views: 11741	Posted: Sat Nov 29, 2008 2:37 pm Subject: why the 3080? Forum: DIY Hardware and Software » Thomas Henry designs
zipzap Replies: 7 Views: 11741	All these circuits are briliant. What is the reason thet the 3080 ota is seen so often? Its hard to get/expensive. Would half a LM13700 work as well in circuits like the VCO1 or UD1?
Topic: Sync for VCO1
zipzap Replies: 10 Views: 15492	Posted: Sat Nov 29, 2008 8:21 am Subject: Sync for VCO1 Forum: DIY Hardware and Software » Thomas Henry designs
zipzap Replies: 10 Views: 15492	Is it possible to implement sync on the vco 1?
Topic: UAF42 Active filter chips
zipzap Replies: 12 Views: 9478	Posted: Fri Nov 28, 2008 10:28 am Subject: UAF42 Active filter chips Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 9478	Someone pointed out to me that this chip is actually not designed for audio. Noisy, slow and rather high distortion. Still i´ll see what i get out of it, maybe it gives the signal a pleasant edge...
Topic: UAF42 Active filter chips
zipzap Replies: 12 Views: 9478	Posted: Thu Nov 27, 2008 3:03 am Subject: UAF42 Active filter chips Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 9478	I´ll keep you up to date. I have to orfer the switches first since i want to do a pcb containing all parts and switches. Wouldn´t want to hand wire 24 rotary switches for a stereo unit. Maybe i can ...
Topic: Deciding on a MIDI2CV converter for my Soundlab
zipzap Replies: 12 Views: 6488	Posted: Wed Nov 26, 2008 5:32 am Subject: Deciding on a MIDI2CV converter for my Soundlab Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 6488	I have a midibox cv and think its fantastic. You can build a very basic 1 or two output version, but 8cvs and 128 gate triggers are possible. It can be programmed to do almost anything with the midi d ...
Topic: UAF42 Active filter chips
zipzap Replies: 12 Views: 9478	Posted: Wed Nov 26, 2008 5:24 am Subject: UAF42 Active filter chips Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 9478	Hi, Heaven´t been here for a while, simply couse i didn´t have the time to build anything... Well, i too have some of these chips and am thinking what to do with them. I once started a discussion, ...
Topic: the snappiest adsr eg of the world schematic
zipzap Replies: 81 Views: 104434	Posted: Sat Mar 15, 2008 2:25 pm Subject: the snappiest adsr eg of the world schematic Forum: DIY Hardware and Software
zipzap Replies: 81 Views: 104434	timing constant (or filterfreq - also the same rc network)) is determined by a resistor and a cap. If you want very long release you can choose the biggest pot, like 10m. For attack you can use a smal ...
Topic: the snappiest adsr eg of the world schematic
zipzap Replies: 81 Views: 104434	Posted: Wed Mar 12, 2008 12:37 pm Subject: the snappiest adsr eg of the world schematic Forum: DIY Hardware and Software
zipzap Replies: 81 Views: 104434	Isn´t it just the timing constant that defines the rise time? smaaler rc - faster attack. Nothing special or modern about that in my understanding. maybe more interesting what happens inbetween the s ...
Topic: My SEKU sequencer.
zipzap Replies: 12 Views: 6960	Posted: Thu Feb 28, 2008 5:05 am Subject: My SEKU sequencer. Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 6960	btw, the panel looks great! nice design.
Topic: My SEKU sequencer.
zipzap Replies: 12 Views: 6960	Posted: Thu Feb 28, 2008 4:48 am Subject: My SEKU sequencer. Forum: DIY Hardware and Software
zipzap Replies: 12 Views: 6960	why is it using 3 4067? not sure how much they can drive, but it sould be enough for 2ma LEDs and as many gates and cv pots as you want. Of course that needs diode decoupling.
Topic: Voltage controlled version of Moog Parametric Equalizer?
zipzap Replies: 60 Views: 72086	Posted: Thu Feb 28, 2008 4:41 am Subject: Voltage controlled version of Moog Parametric Equalizer? Forum: DIY Hardware and Software » Jürgen Haible designs
zipzap Replies: 60 Views: 72086	and 2 for me as well. thanks for your great work!
Topic: DIY Modular Compressor ?
zipzap Replies: 37 Views: 56428	Posted: Thu Feb 28, 2008 4:16 am Subject: DIY Modular Compressor ? Forum: DIY Hardware and Software
zipzap Replies: 37 Views: 56428	4 and 5 look best to me. More or less the same... And they use an precision rectifier (quite important for an compressor in my oppinion) I would use 10k for the ouput amp although that´s no big diff ...
Topic: Tube VCF on Dutch synth forum
zipzap Replies: 79 Views: 124536	Posted: Mon Jan 14, 2008 9:30 am Subject: Tube VCF on Dutch synth forum Forum: DIY Hardware and Software
zipzap Replies: 79 Views: 124536	Whatever i say, these are only my observations. This is rather experiance than reall knowlege. Please correct me... i have been experimenting with the 12sh1p. It needs 12V, but only very little curre ...
Topic: PT1000 as Temco
zipzap Replies: 7 Views: 3447	Posted: Sat Jan 12, 2008 10:30 am Subject: PT1000 as Temco Forum: DIY Hardware and Software
zipzap Replies: 7 Views: 3447	It is 100r in series with the pt1000. Makes 1k1. Then something in parallel to the whole thing to drop the resistance back to 1k. Problem is that normal resistors vary in their tk, but i was told tha ...
Topic: Time for a bit of theory
zipzap Replies: 50 Views: 12126	Posted: Sat Jan 12, 2008 10:24 am Subject: Time for a bit of theory Forum: DIY Hardware and Software
zipzap Replies: 50 Views: 12126	great explanaition. i´ll have to read it again though with a little more time than right now. you´re talking about current flowing through the cap. i always thought since the two ends of the cap are ...
Topic: PT1000 as Temco
zipzap Replies: 7 Views: 3447	Posted: Fri Jan 11, 2008 5:47 pm Subject: PT1000 as Temco Forum: DIY Hardware and Software
zipzap Replies: 7 Views: 3447	I once got told that 100R series and a parallal resistor (can´t remember exact value, so that it ends up at 1k) will lower the tk of the pt1000 to 3500.
Topic: Time for a bit of theory
zipzap Replies: 50 Views: 12126	Posted: Fri Jan 11, 2008 5:41 pm Subject: Time for a bit of theory Forum: DIY Hardware and Software
zipzap Replies: 50 Views: 12126	what happens if you replace the resistor with a cap?
Topic: Tube VCF on Dutch synth forum
zipzap Replies: 79 Views: 124536	Posted: Fri Jan 11, 2008 5:15 pm Subject: Tube VCF on Dutch synth forum Forum: DIY Hardware and Software
zipzap Replies: 79 Views: 124536	If you can´t get a 5672 i´m sure most tubes will work somehow in this circuit. raising the voltage to 30v (or +-15) might help if a tube sounds like it´s broken.
Topic: Tube VCF on Dutch synth forum
zipzap Replies: 79 Views: 124536	Posted: Fri Jan 11, 2008 5:06 pm Subject: Tube VCF on Dutch synth forum Forum: DIY Hardware and Software
zipzap Replies: 79 Views: 124536	Those samples sound perfect! Love that 12v tube stuff. I´m triying to figure out how it works. WHat about C2 and C3? should be of same value, i guess? Can someone explein what the 130n-130k at the ga ...
Topic: external sound Clock Detector (...and Multiplier)?
zipzap Replies: 1 Views: 2060	Posted: Tue Nov 27, 2007 7:09 am Subject: external sound Clock Detector (...and Multiplier)? Forum: DIY Hardware and Software
zipzap Replies: 1 Views: 2060	well, you mentioned all i know. LFO frequency, depends on what that means. Generally the pll can´t look in the future, so it always takes some cycles to look in. But if the source is stable in speed ...