G
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Mine's broke too.
Help Support GroupDIY Audio Forum:
..could be a broken picture link in there, that acts up when the forum software tries to resize..?
Whatever image mark posted is not opening. The image resizing has a problem with that and it hangs when pictures don't load. I have temporarily disabled the resizing feature, so you should be able to open the thread now.
Mark Burnley
Well-known member
Whoops!
:?
sorry Jaakko- yep, it looks like my host is down! I've disabled my avatar for now, to make things easier + stop pages hanging. I'll e-mail you the schem if you want Jaakko...
I'll see if I can get things back up!
wanapoo fails again :evil:
Mark
:?
sorry Jaakko- yep, it looks like my host is down! I've disabled my avatar for now, to make things easier + stop pages hanging. I'll e-mail you the schem if you want Jaakko...
I'll see if I can get things back up!
wanapoo fails again :evil:
Mark
Mark Burnley
Well-known member
Hmm,
Things seem magically fixed- ah well, thanks for sorting the thread out guys!
Carry on...
:thumb:
Mark
Things seem magically fixed- ah well, thanks for sorting the thread out guys!
Carry on...
:thumb:
Mark
I think my link is broken.
Should I see a doctor? :razz:
Should I see a doctor? :razz:
Mark Burnley
Well-known member
Cool,
You can always guarantee that you'll find the function you need among the "gate level" CMOS/TTL series. Sometimes it's worth finding the list of 74xx and 4xxx series IC's and keeping it nearby during design work- things like AND/OR select gates and multiplexers can be amazingly handy in audio-based digital control work!
One of the best practical CMOS overviews which I use daily is this book:
CMOS Circuits Manual by R M Marston
...it basically compiles all the 4000 series functions in one book- I know it's all in the datasheets, but this saves a ton of time!
Let us know how it goes with your input selector, I reckon you could do the extra inputs from the same 4028 (datasheet) by using some clever diode switching to activate more inputs.
:thumb:
Mark
You can always guarantee that you'll find the function you need among the "gate level" CMOS/TTL series. Sometimes it's worth finding the list of 74xx and 4xxx series IC's and keeping it nearby during design work- things like AND/OR select gates and multiplexers can be amazingly handy in audio-based digital control work!
One of the best practical CMOS overviews which I use daily is this book:
CMOS Circuits Manual by R M Marston
...it basically compiles all the 4000 series functions in one book- I know it's all in the datasheets, but this saves a ton of time!
Let us know how it goes with your input selector, I reckon you could do the extra inputs from the same 4028 (datasheet) by using some clever diode switching to activate more inputs.
:thumb:
Mark
Mark Burnley
Well-known member
Relay controlled patchbay...now that's a wiring job....
:shock:
..mind you, I've seen your passive EQ pics, so I know you're the man for the job!
:green:
Mark
:shock:
..mind you, I've seen your passive EQ pics, so I know you're the man for the job!
:green:
Mark
Speaking of controllable patchbays...are any you guys familiar with this chip from AD: http://www.analog.com/en/prod/0,2877,AD75019,00.html
There was thread on the ucapps/midibox forum a while back with this idea in mind - looks pretty straightforward to setup with MIOS (just coding would be the tricky bit unless u know the coo with that)...
Anyway, just after some feedbak on using these chips and consequent effect on audio signal...
Cheers
There was thread on the ucapps/midibox forum a while back with this idea in mind - looks pretty straightforward to setup with MIOS (just coding would be the tricky bit unless u know the coo with that)...
Anyway, just after some feedbak on using these chips and consequent effect on audio signal...
Cheers
Mark Burnley
Well-known member
Jaakko,
An even better CMOS IC for a 16-channel app is the CD4514- (much beloved by us analog sequencer DIY-ers!) It's a 4-to-16 channel decoder. Like the 4028, it takes a 4-bit binary "nibble" and converts it to a decimal (0-15) output.
datasheet
You could have the outputs feeding 16 T-type ("toggle") flip-flops, and address each relay sequentially with a fast-ish clock. The first pulse would "set" the relay, the second would "reset" the relay. The Commodore 64 (come on- a PIC is a bit smaller and self-bootable, there's no place for cassette data storage in the 21st Century :wink: ) could supply the on/off binary numbers under some form of control.
Mark
An even better CMOS IC for a 16-channel app is the CD4514- (much beloved by us analog sequencer DIY-ers!) It's a 4-to-16 channel decoder. Like the 4028, it takes a 4-bit binary "nibble" and converts it to a decimal (0-15) output.
datasheet
You could have the outputs feeding 16 T-type ("toggle") flip-flops, and address each relay sequentially with a fast-ish clock. The first pulse would "set" the relay, the second would "reset" the relay. The Commodore 64 (come on- a PIC is a bit smaller and self-bootable, there's no place for cassette data storage in the 21st Century :wink: ) could supply the on/off binary numbers under some form of control.
Mark
