Search found 317 matches

See the recent thread about the Chinese resistors that are sold as metal film and are blue but have the temperature coefficient of a carbon resistor. Sad

Check the minimum high threshold of the 5V CMOS device.

Asynchronous designs in CPLD/FPGA are just asking for trouble, especially for beginners.

I think what you should be building is a dual-clock FIFO, though this is more commonly done in FPGA where yo ...

What devices are available to the amateur, have solderable pins, can be programmed by a home-built, or affordable, programmer and have more resources?

Altera has some really nice CPLDs in the ...

He has a funny post somewhere about building a precision CV summer for less than a Venti coffee at Starbucks. Laughing

Isn't the LT1013 popular in low offset applications?

They seem to be calling a TDS1000B a DPO scope these days, and that's "only" ~$900.

I guess I'm one of the only ones who prefers a digital scope. Any of the newer Tektronix scopes with the "digital phosphor" is pretty sweet.

Thanks for this post. I actually have some of the Sure Electronics resistors and make a point to test ~10 of every value of resistor. I've almost always found them to be within 1%, but I never thought ...

peng, your fracanana module looks great. Cool

Blue Hell, I'm with you on bit banging state machines, but at that point I'd rather be using VHDL than assembly. Wink

In that case does indeed sound like a headache. Sad

Do they have I2C A/D that meet your needs? Or maybe I2C to another uC as a SPI bridge?

What microcontroller are you using? Its been awhile since I've done any uC stuff, but this shouldn't be that hard.

As you discovered there should be a clock polarity control and a clock phase contr ...

I don't have anything against SVF I am just interested in why it doesn't behave like other recursive filters.

I see Magnus's explanation involving Tustin's transform. That's probably a step in the right direction, but other IIR using Tustin's transform (Butterworth, Chebychev, Elliptic) still don't have the s ...

The limitation is not a hard rule, its something to take into consideration when doing a design.

I think the reason you didn't see it in an RC emulation is that a single order system doesn't have s ...

Though I do think you usually have to have some idea of what the core is doing so you can interface to it and test it, etc.

I understand your desire to learn rather than just use. The problem is that FPGA have become so complicated that you really have to choose what portions you want to be an expert in and what you'll...a ...

Have you tried the DDR core on opencores.org? Its almost a shame to waste SRAM on audio.

I guess I've done worse, making a 1 second stereo delay with block RAM. Embarassed

Seems like that FPGA is about $50, but a pain to work with (if you were to build boards). Sad

Stratix III
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=544-2534-ND

Virtex 5
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=XC5VLX330-2FFG1760C-ND
...

Both Altera and Xilinx sell FPGA that cost over $10,000. Stratix III and IV GX by Altera and Virtex 5 by Xilinx come to mind. For synthesizers 2M gate device is pretty ample, though I think multiplier ...

Neat paintjob and rockin' skirted pots. Cool

http://online.physics.uiuc.edu/courses/phys498pom/Student_Projects/Fall02/RLee/Ryan_Lee_P398EMI_Main_Report.pdf

Has some beautiful guitar pluck plots. More of his work can be found here:

http:// ...

Hey you bring up interesting things to search out.

What bothers me is the inconsistency, it appears that sometimes the fundamental is the largest tone, sometimes not. That really does make processi ...

Author	Message
Topic: Resistors
urbanscallywag Replies: 5 Views: 2487	Posted: Sun May 03, 2009 9:01 pm Subject: Resistors Forum: DIY Hardware and Software
urbanscallywag Replies: 5 Views: 2487	See the recent thread about the Chinese resistors that are sold as metal film and are blue but have the temperature coefficient of a carbon resistor.
Topic: Question about CPLDs
urbanscallywag Replies: 17 Views: 11926	Posted: Fri Apr 17, 2009 11:20 pm Subject: Question about CPLDs Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 17 Views: 11926	Check the minimum high threshold of the 5V CMOS device.
Topic: Beginner Verilog Question
urbanscallywag Replies: 11 Views: 9238	Posted: Fri Apr 17, 2009 11:14 pm Subject: Beginner Verilog Question Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 11 Views: 9238	Asynchronous designs in CPLD/FPGA are just asking for trouble, especially for beginners. I think what you should be building is a dual-clock FIFO, though this is more commonly done in FPGA where yo ...
Topic: Programmable Logic as Equal-Temperament generator
urbanscallywag Replies: 6 Views: 11679	Posted: Fri Apr 17, 2009 11:07 pm Subject: Re: Programmable Logic as Equal-Temperament generator Subject description: Suitable Devices (if any) Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 6 Views: 11679	What devices are available to the amateur, have solderable pins, can be programmed by a home-built, or affordable, programmer and have more resources? Altera has some really nice CPLDs in the ...
Topic: Which OpAmp for buffering a CV distro Multiple?
urbanscallywag Replies: 14 Views: 8324	Posted: Sat Apr 11, 2009 12:17 pm Subject: Which OpAmp for buffering a CV distro Multiple? Forum: DIY Hardware and Software
urbanscallywag Replies: 14 Views: 8324	He has a funny post somewhere about building a precision CV summer for less than a Venti coffee at Starbucks.
Topic: Which OpAmp for buffering a CV distro Multiple?
urbanscallywag Replies: 14 Views: 8324	Posted: Sat Apr 11, 2009 11:14 am Subject: Which OpAmp for buffering a CV distro Multiple? Forum: DIY Hardware and Software
urbanscallywag Replies: 14 Views: 8324	Isn't the LT1013 popular in low offset applications?
Topic: Digital vs. Analog Scopes
urbanscallywag Replies: 20 Views: 4634	Posted: Sun Apr 05, 2009 11:09 pm Subject: Digital vs. Analog Scopes Forum: DIY Hardware and Software
urbanscallywag Replies: 20 Views: 4634	They seem to be calling a TDS1000B a DPO scope these days, and that's "only" ~$900.
Topic: Digital vs. Analog Scopes
urbanscallywag Replies: 20 Views: 4634	Posted: Sun Apr 05, 2009 7:57 pm Subject: Digital vs. Analog Scopes Forum: DIY Hardware and Software
urbanscallywag Replies: 20 Views: 4634	I guess I'm one of the only ones who prefers a digital scope. Any of the newer Tektronix scopes with the "digital phosphor" is pretty sweet.
Topic: Be very careful when ordering resistors from china !
urbanscallywag Replies: 48 Views: 45206	Posted: Sun Apr 05, 2009 7:51 pm Subject: Be very careful when ordering resistors from china ! Forum: DIY Hardware and Software
urbanscallywag Replies: 48 Views: 45206	Thanks for this post. I actually have some of the Sure Electronics resistors and make a point to test ~10 of every value of resistor. I've almost always found them to be within 1%, but I never thought ...
Topic: Frac rack Banana Jack...some spec guidlines
urbanscallywag Replies: 34 Views: 30847	Posted: Sun Apr 05, 2009 7:32 pm Subject: Frac rack Banana Jack...some spec guidlines Forum: DIY Hardware and Software
urbanscallywag Replies: 34 Views: 30847	peng, your fracanana module looks great.
Topic: SPI interfacing... is it supposed to be painful?
urbanscallywag Replies: 19 Views: 14694	Posted: Tue Jan 06, 2009 8:57 pm Subject: SPI interfacing... is it supposed to be painful? Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 19 Views: 14694	Blue Hell, I'm with you on bit banging state machines, but at that point I'd rather be using VHDL than assembly.
Topic: SPI interfacing... is it supposed to be painful?
urbanscallywag Replies: 19 Views: 14694	Posted: Mon Jan 05, 2009 10:01 pm Subject: SPI interfacing... is it supposed to be painful? Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 19 Views: 14694	In that case does indeed sound like a headache. Do they have I2C A/D that meet your needs? Or maybe I2C to another uC as a SPI bridge?
Topic: SPI interfacing... is it supposed to be painful?
urbanscallywag Replies: 19 Views: 14694	Posted: Mon Jan 05, 2009 8:47 pm Subject: SPI interfacing... is it supposed to be painful? Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
urbanscallywag Replies: 19 Views: 14694	What microcontroller are you using? Its been awhile since I've done any uC stuff, but this shouldn't be that hard. As you discovered there should be a clock polarity control and a clock phase contr ...
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 3:43 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	I don't have anything against SVF I am just interested in why it doesn't behave like other recursive filters.
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 3:29 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	I see Magnus's explanation involving Tustin's transform. That's probably a step in the right direction, but other IIR using Tustin's transform (Butterworth, Chebychev, Elliptic) still don't have the s ...
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 3:26 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	The limitation is not a hard rule, its something to take into consideration when doing a design. I think the reason you didn't see it in an RC emulation is that a single order system doesn't have s ...
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 2:03 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	Though I do think you usually have to have some idea of what the core is doing so you can interface to it and test it, etc.
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 1:45 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	I understand your desire to learn rather than just use. The problem is that FPGA have become so complicated that you really have to choose what portions you want to be an expert in and what you'll...a ...
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 1:04 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	Have you tried the DDR core on opencores.org? Its almost a shame to waste SRAM on audio. I guess I've done worse, making a 1 second stereo delay with block RAM.
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 12:21 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	Seems like that FPGA is about $50, but a pain to work with (if you were to build boards).
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 12:16 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	Stratix III http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=544-2534-ND Virtex 5 http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=XC5VLX330-2FFG1760C-ND ...
Topic: what does a wav file data sample value mean?
urbanscallywag Replies: 45 Views: 10761	Posted: Fri Jan 02, 2009 12:09 pm Subject: what does a wav file data sample value mean? Forum: DIY Hardware and Software
urbanscallywag Replies: 45 Views: 10761	Both Altera and Xilinx sell FPGA that cost over $10,000. Stratix III and IV GX by Altera and Virtex 5 by Xilinx come to mind. For synthesizers 2M gate device is pretty ample, though I think multiplier ...
Topic: Simmons SDS 3 - DIY?
urbanscallywag Replies: 353 Views: 389872	Posted: Fri Jan 02, 2009 10:43 am Subject: Simmons SDS 3 - DIY? Forum: DIY Hardware and Software
urbanscallywag Replies: 353 Views: 389872	Neat paintjob and rockin' skirted pots.
Topic: Alternate Guitar Pickup Concepts
urbanscallywag Replies: 44 Views: 50054	Posted: Thu Jan 01, 2009 8:26 pm Subject: Alternate Guitar Pickup Concepts Forum: Instruments and Equipment » Strings and things
urbanscallywag Replies: 44 Views: 50054	http://online.physics.uiuc.edu/courses/phys498pom/Student_Projects/Fall02/RLee/Ryan_Lee_P398EMI_Main_Report.pdf Has some beautiful guitar pluck plots. More of his work can be found here: http:// ...
Topic: Alternate Guitar Pickup Concepts
urbanscallywag Replies: 44 Views: 50054	Posted: Thu Jan 01, 2009 8:02 pm Subject: Alternate Guitar Pickup Concepts Forum: Instruments and Equipment » Strings and things
urbanscallywag Replies: 44 Views: 50054	Hey you bring up interesting things to search out. What bothers me is the inconsistency, it appears that sometimes the fundamental is the largest tone, sometimes not. That really does make processi ...