Search found 30 matches

What's your sampling rate?
Did you worry about band-limited waveforms for the DCOs?

just straight (w/out the VCA modulation), how does the sound of this compare to other ring-mod designs, like 633 or even passive transformer/diode?

This looks like a "switching mixer" i.e ...

Talk about bad luck! Yesterday I was adding second +5V voltage regulator to PSU, as the panel drawn too much current for one 7805, and the voltage dropped to ~4.75V. It was easy task, but after puttin ...

Some won't like this idea of sampling but...
You could always look into Time Division Multiplexing over a 1/4" jack.
That way an input attenuator will attenuate all polyphonic signals, and mon ...

What about 7406 or 7407 open-collector inverter/buffers?

I always thought somehting like the AD538 Real-Time Analog Computational Unit (ACU)
http://www.analog.com/en/other/analog-multipliersdividers/ad538/products/product.html
would be interesting in a m ...

Maybe some other aussies here might remember these, but a member of Clan Analogue used to make boxes call the "swing-a-lizer" or something like that.

They were kind of a din master clock ...

I'm tempted to get on the job at coding something for an AVR processor, it shouldn't be that much work involved.
The problem is I don't have any Roland sync machines to try it on.
No swing for me... ...

ok after reading a few things and checking out some other examples of sync here is my first implementation of syncing this circuit. i have not bredboarded it yet the parts are on route from futurlec a ...

I always thought a tie-rack would work.
Maybe an electric one.

http://www.proidee.co.uk/shop/SID_0123456789_02_GB/F=produkt_formular/P=02_GB_561423/K=02_GB_2461/HI=produktuebersicht_text

Cheers

In the meantime, here's that Supernova documentation.

Cool Thanks!

I pretty much cloned the CD4053/LM339 section of the blanking circuitry exactly, except that the black level inputs a ...

I have a Sh!tload of Elantec EL2120's ( http://www.datasheetcatalog.org/datasheet/intersil/fn7044.pdf ) if you need.

It is a "wideband current feedback amplifier optimized for video performanc ...

is this the function of the blanking & pedistal board found in the Sandin
between the RGB input jacks and the color encoder board?
any hints on how to achieve this with the 1377?

Quote ...

I pulled out my MC1377+LM1881 circuit again last night and tried to drive the Red input with my XR-VCO synced to the VSync generated by a dummy signal sent by a VCR to the LM1881. It definitely worke ...

Time to revive this thread! Smile

I finally built a MC1377 RGB-to-Composite+LM1881 Sync Seperator circuit based on the schematics I posted earlier in this thread, and -- it works! By this I mean that ...

I bought one of those +/-12V on the off chance it might be useful.
Looking at the schematic and the data sheet for the LM2575.
The -12V rail is really only spec'ed to 0.35A.

The outputs are qui ...

With regard to the sync, yes, it's using the FSK capability of the XR chip. But just as important are these two properties:

1. The period of the reset pulse is much more narrow than the period of ...

This is a cute little flash website for n-channel jfet
http://www-g.eng.cam.ac.uk/mmg/teaching/linearcircuits/jfet.html
and mosfet
http://www-g.eng.cam.ac.uk/mmg/teaching/linearcircuits/mosfet.html

Sounds similar to what I suggested for an alternate XR2206 sync:
http://electro-music.com/forum/viewtopic.php?highlight=sync&t=28182
I'm having trouble understanding that circuit. Aren't T1 and ...

-- Now, given a couple of months, I've had *some* success using this approach.. but sometimes not.

I've been using, for example, the XR2209 and this required a stronger reset pulse - so I replace ...

Or something like this...maybe use the opamp to level shift/amplify.

http://www.talkingelectronics.com/projects/SpotMistakes/images/SpotCct9.gif

I'm trying to implement hard sync (not the TH way) on a XR2206 VCO.
I've tried shorting out the cap (using a 4066 analog switch)
and the problem seems to be that the cycle is reset to either 0 or ...

BOB-SNARE/anyone: If you're interested in keeping PLCC-44, why not divide the design into multiple pieces/chips? Luckily there is no reason the signals couldn't come from 2 or more CPLD.

I would op ...

What are you using a table for?

By table, I meant the "magic" sequence that Scott posted before, not a LUT.

And are you using VHDL, Verilog, or schematic capture?

VHDL

I didn't realize how few flip flops are in the smallest CPLD. I may have to eat my words about putting a top octave generator in such a small part. Embarassed

But I still think it can be done. Smile

...

Author	Message
Topic: SK-Synth: A subtractive FPGA synthesizer
BOB-SNARE Replies: 30 Views: 61060	Posted: Sun Oct 03, 2010 9:20 pm Subject: SK-Synth: A subtractive FPGA synthesizer Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
BOB-SNARE Replies: 30 Views: 61060	What's your sampling rate? Did you worry about band-limited waveforms for the DCOs?
Topic: Voltage Controlled OpAmp RingMod (Modulator)
BOB-SNARE Replies: 208 Views: 233270	Posted: Fri Feb 05, 2010 1:48 am Subject: Voltage Controlled OpAmp RingMod (Modulator) Forum: DIY Hardware and Software » fonik's place
BOB-SNARE Replies: 208 Views: 233270	just straight (w/out the VCA modulation), how does the sound of this compare to other ring-mod designs, like 633 or even passive transformer/diode? This looks like a "switching mixer" i.e ...
Topic: DIY Polysynth
BOB-SNARE Replies: 48 Views: 61034	Posted: Mon Oct 19, 2009 5:22 pm Subject: DIY Polysynth Forum: DIY Hardware and Software
BOB-SNARE Replies: 48 Views: 61034	Talk about bad luck! Yesterday I was adding second +5V voltage regulator to PSU, as the panel drawn too much current for one 7805, and the voltage dropped to ~4.75V. It was easy task, but after puttin ...
Topic: The Polyphonic Jack Choice?
BOB-SNARE Replies: 10 Views: 4904	Posted: Thu Sep 10, 2009 9:17 pm Subject: The Polyphonic Jack Choice? Forum: DIY Hardware and Software
BOB-SNARE Replies: 10 Views: 4904	Some won't like this idea of sampling but... You could always look into Time Division Multiplexing over a 1/4" jack. That way an input attenuator will attenuate all polyphonic signals, and mon ...
Topic: CMOS GATE BOOSTER
BOB-SNARE Replies: 10 Views: 4237	Posted: Tue Sep 08, 2009 8:24 pm Subject: CMOS GATE BOOSTER Forum: DIY Hardware and Software
BOB-SNARE Replies: 10 Views: 4237	What about 7406 or 7407 open-collector inverter/buffers?
Topic: Reconfigurable Circuits
BOB-SNARE Replies: 10 Views: 4370	Posted: Mon Aug 17, 2009 8:07 pm Subject: Reconfigurable Circuits Forum: DIY Hardware and Software
BOB-SNARE Replies: 10 Views: 4370	I always thought somehting like the AD538 Real-Time Analog Computational Unit (ACU) http://www.analog.com/en/other/analog-multipliersdividers/ad538/products/product.html would be interesting in a m ...
Topic: Din Sync Shuffle
BOB-SNARE Replies: 21 Views: 17875	Posted: Mon Mar 02, 2009 6:48 pm Subject: Din Sync Shuffle Forum: DIY Hardware and Software » Developers' Corner
BOB-SNARE Replies: 21 Views: 17875	Maybe some other aussies here might remember these, but a member of Clan Analogue used to make boxes call the "swing-a-lizer" or something like that. They were kind of a din master clock ...
Topic: Din Sync Shuffle
BOB-SNARE Replies: 21 Views: 17875	Posted: Mon Mar 02, 2009 1:46 am Subject: Din Sync Shuffle Forum: DIY Hardware and Software » Developers' Corner
BOB-SNARE Replies: 21 Views: 17875	I'm tempted to get on the job at coding something for an AVR processor, it shouldn't be that much work involved. The problem is I don't have any Roland sync machines to try it on. No swing for me... ...
Topic: implementing sync
BOB-SNARE Replies: 35 Views: 8695	Posted: Wed Feb 11, 2009 5:33 pm Subject: implementing sync Forum: DIY Hardware and Software
BOB-SNARE Replies: 35 Views: 8695	ok after reading a few things and checking out some other examples of sync here is my first implementation of syncing this circuit. i have not bredboarded it yet the parts are on route from futurlec a ...
Topic: cable tree or stand?
BOB-SNARE Replies: 11 Views: 4166	Posted: Tue Feb 03, 2009 9:33 pm Subject: cable tree or stand? Forum: DIY Hardware and Software
BOB-SNARE Replies: 11 Views: 4166	I always thought a tie-rack would work. Maybe an electric one. http://www.proidee.co.uk/shop/SID_0123456789_02_GB/F=produkt_formular/P=02_GB_561423/K=02_GB_2461/HI=produktuebersicht_text Cheers
Topic: Using the MC1377 to generate video
BOB-SNARE Replies: 96 Views: 145330	Posted: Mon Jan 19, 2009 5:24 pm Subject: Using the MC1377 to generate video Forum: DIY Hardware and Software » Video synthesis and manipulation
BOB-SNARE Replies: 96 Views: 145330	In the meantime, here's that Supernova documentation. Cool Thanks! I pretty much cloned the CD4053/LM339 section of the blanking circuitry exactly, except that the black level inputs a ...
Topic: Using the MC1377 to generate video
BOB-SNARE Replies: 96 Views: 145330	Posted: Thu Jan 15, 2009 3:37 pm Subject: Using the MC1377 to generate video Forum: DIY Hardware and Software » Video synthesis and manipulation
BOB-SNARE Replies: 96 Views: 145330	I have a Sh!tload of Elantec EL2120's ( http://www.datasheetcatalog.org/datasheet/intersil/fn7044.pdf ) if you need. It is a "wideband current feedback amplifier optimized for video performanc ...
Topic: Using the MC1377 to generate video
BOB-SNARE Replies: 96 Views: 145330	Posted: Mon Jan 05, 2009 8:49 pm Subject: Using the MC1377 to generate video Forum: DIY Hardware and Software » Video synthesis and manipulation
BOB-SNARE Replies: 96 Views: 145330	is this the function of the blanking & pedistal board found in the Sandin between the RGB input jacks and the color encoder board? any hints on how to achieve this with the 1377? Quote ...
Topic: Using the MC1377 to generate video
BOB-SNARE Replies: 96 Views: 145330	Posted: Tue Dec 23, 2008 3:44 am Subject: Using the MC1377 to generate video Forum: DIY Hardware and Software » Video synthesis and manipulation
BOB-SNARE Replies: 96 Views: 145330	I pulled out my MC1377+LM1881 circuit again last night and tried to drive the Red input with my XR-VCO synced to the VSync generated by a dummy signal sent by a VCR to the LM1881. It definitely worke ...
Topic: Using the MC1377 to generate video
BOB-SNARE Replies: 96 Views: 145330	Posted: Wed Dec 17, 2008 5:10 pm Subject: Using the MC1377 to generate video Forum: DIY Hardware and Software » Video synthesis and manipulation
BOB-SNARE Replies: 96 Views: 145330	Time to revive this thread! I finally built a MC1377 RGB-to-Composite+LM1881 Sync Seperator circuit based on the schematics I posted earlier in this thread, and -- it works! By this I mean that ...
Topic: Futurlec offering pre-built PSU boards $9 bucks! zomg!
BOB-SNARE Replies: 4 Views: 1862	Posted: Mon Nov 24, 2008 7:01 pm Subject: Futurlec offering pre-built PSU boards $9 bucks! zomg! Forum: DIY Hardware and Software
BOB-SNARE Replies: 4 Views: 1862	I bought one of those +/-12V on the off chance it might be useful. Looking at the schematic and the data sheet for the LM2575. The -12V rail is really only spec'ed to 0.35A. The outputs are qui ...
Topic: TH VCO-1 and XR-VCO?
BOB-SNARE Replies: 39 Views: 11121	Posted: Tue Nov 04, 2008 10:25 pm Subject: TH VCO-1 and XR-VCO? Forum: DIY Hardware and Software
BOB-SNARE Replies: 39 Views: 11121	With regard to the sync, yes, it's using the FSK capability of the XR chip. But just as important are these two properties: 1. The period of the reset pulse is much more narrow than the period of ...
Topic: implementing sync
BOB-SNARE Replies: 35 Views: 8695	Posted: Fri Oct 31, 2008 4:22 am Subject: implementing sync Forum: DIY Hardware and Software
BOB-SNARE Replies: 35 Views: 8695	This is a cute little flash website for n-channel jfet http://www-g.eng.cam.ac.uk/mmg/teaching/linearcircuits/jfet.html and mosfet http://www-g.eng.cam.ac.uk/mmg/teaching/linearcircuits/mosfet.html
Topic: implementing sync
BOB-SNARE Replies: 35 Views: 8695	Posted: Thu Oct 30, 2008 6:10 pm Subject: implementing sync Forum: DIY Hardware and Software
BOB-SNARE Replies: 35 Views: 8695	Sounds similar to what I suggested for an alternate XR2206 sync: http://electro-music.com/forum/viewtopic.php?highlight=sync&t=28182 I'm having trouble understanding that circuit. Aren't T1 and ...
Topic: implementing sync
BOB-SNARE Replies: 35 Views: 8695	Posted: Thu Oct 30, 2008 3:11 am Subject: implementing sync Forum: DIY Hardware and Software
BOB-SNARE Replies: 35 Views: 8695	-- Now, given a couple of months, I've had some success using this approach.. but sometimes not. I've been using, for example, the XR2209 and this required a stronger reset pulse - so I replace ...
Topic: Voltage indicator
BOB-SNARE Replies: 11 Views: 3112	Posted: Tue Oct 28, 2008 11:14 pm Subject: Voltage indicator Forum: DIY Hardware and Software
BOB-SNARE Replies: 11 Views: 3112	Or something like this...maybe use the opamp to level shift/amplify. http://www.talkingelectronics.com/projects/SpotMistakes/images/SpotCct9.gif
Topic: XR2206 question
BOB-SNARE Replies: 4 Views: 2227	Posted: Mon Oct 27, 2008 4:50 pm Subject: XR2206 question Forum: DIY Hardware and Software
BOB-SNARE Replies: 4 Views: 2227	I'm trying to implement hard sync (not the TH way) on a XR2206 VCO. I've tried shorting out the cap (using a 4066 analog switch) and the problem seems to be that the cycle is reset to either 0 or ...
Topic: DIY Top Octave Generator
BOB-SNARE Replies: 57 Views: 26053	Posted: Wed Oct 22, 2008 5:34 pm Subject: DIY Top Octave Generator Forum: DIY Hardware and Software
BOB-SNARE Replies: 57 Views: 26053	BOB-SNARE/anyone: If you're interested in keeping PLCC-44, why not divide the design into multiple pieces/chips? Luckily there is no reason the signals couldn't come from 2 or more CPLD. I would op ...
Topic: DIY Top Octave Generator
BOB-SNARE Replies: 57 Views: 26053	Posted: Mon Oct 13, 2008 7:00 pm Subject: DIY Top Octave Generator Forum: DIY Hardware and Software
BOB-SNARE Replies: 57 Views: 26053	What are you using a table for? By table, I meant the "magic" sequence that Scott posted before, not a LUT. And are you using VHDL, Verilog, or schematic capture? VHDL
Topic: DIY Top Octave Generator
BOB-SNARE Replies: 57 Views: 26053	Posted: Mon Oct 13, 2008 6:36 pm Subject: DIY Top Octave Generator Forum: DIY Hardware and Software
BOB-SNARE Replies: 57 Views: 26053	I didn't realize how few flip flops are in the smallest CPLD. I may have to eat my words about putting a top octave generator in such a small part. But I still think it can be done. ...