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WIGGLING 'LITE' IN GUEST MODE

LZX Cadet Series (DIY/Assembled)
MUFF WIGGLER Forum Index -> Video Synthesis Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next [all]
Author LZX Cadet Series (DIY/Assembled)
FetidEye
yes
sync24
hello,
i just realised I don't have an LT1251CN#PBF for the Fader,
can anyone help me out with where to get one???

Cheers!
FetidEye
Linear Technologies has very high shipping costs, about 60,- euro on top of the already expensive IC's.
You can get samples, but not more than 2-3 ic's
I've been told that if you ask for samples, you won't have to pay for the shipping.

So now I've ordered them here:
http://www.ebay.com/itm/371640802567


When they arrive, I will test them and (hopefully) confirm here that they work.


These are also compatible:
http://www.ebay.com/itm/1PCS-LT1256CS-40MHz-Video-Fader-and-DC-Gain-Co ntrolled-Amplifier-SOP14-/222302943961?hash=item33c249bad9:g:NFoAAOSwB LlVcsH9

But you will need a SOP14 to DIP converter, which I could not find.
(only a DIP type where the pins are wider apart than 'normal')
eth
For SMD to DIP, I've looked at Proto Advantage before. Haven't actually tried them, and they aren't overly cheap, but... this one is a SOP-24 to 0.1" DIP pins, I imagine you could just use the 14 pins you need and don't attach the other 10 (seems slightly wasteful oops)

http://www.proto-advantage.com/store/product_info.php?products_id=2200 010
sync24
FetidEye wrote:
Linear Technologies has very high shipping costs, about 60,- euro on top of the already expensive IC's.
You can get samples, but not more than 2-3 ic's
I've been told that if you ask for samples, you won't have to pay for the shipping.

So now I've ordered them here:
http://www.ebay.com/itm/371640802567


When they arrive, I will test them and (hopefully) confirm here that they work.


These are also compatible:
http://www.ebay.com/itm/1PCS-LT1256CS-40MHz-Video-Fader-and-DC-Gain-Co ntrolled-Amplifier-SOP14-/222302943961?hash=item33c249bad9:g:NFoAAOSwB LlVcsH9

But you will need a SOP14 to DIP converter, which I could not find.
(only a DIP type where the pins are wider apart than 'normal')


Ah, great!
I am trying the sample-request-route...

the sop14 to dip converters seem to be do-able, though too...

thanks!!!
Dirty_Bill
I thought about doing a group buy...Shipping for me is not an issue as it's just across town, but I don't know what the price breaks would be...
FetidEye
if the converter costs about 4,- euro, you can just as well buy the DIP LT1251
You'd come out cheaper even
sync24
makers wrote:
I just finished my first Cadet! The Cadet IX VCO build was straight forward and works well with sync from my Visual Cortex.

I used this switch for sync. It seems to be very close to the Mountain 10TF230 switch in the BOM. It works fine and looks fine with the other switch but does not sit flush with the PCB when you solder it in.

http://www.mouser.com/Search/ProductDetail.aspx?R=M2012S2A2G30virtualk ey63300000virtualkey633-M2012S2A2G30


ooh, cheers - I grabbed some of these - nice fit!
Thanks
ehafh
makers wrote:
I just found this on the LZX VI Fader assembly notes:

"We recommend you avoid socketing the ICs. Capacitance in the sockets can affect higher bandwidth circuitry more than it would in audio applications."

I added sockets to my VCO builds. Does anyone have any insight?
Should I try to remove the sockets from my build? How would a capacitance problem behave?


i didn't build the fader yet but also saw that note on the information.

are we to assume this is the only module that suggests doing that?
i don't think it's on any other information sections. but i didn't double check.

also, if it's in need of ultra fine tuning couldn't a trimmer be placed somewhere and a calibration
procedure be described? it would be better to know 100% that the build meets whatever
specification they want it to be at. i have no real designing knowledge at this point so just a thought.
makers
FetidEye wrote:


These are also compatible:
http://www.ebay.com/itm/1PCS-LT1256CS-40MHz-Video-Fader-and-DC-Gain-Co ntrolled-Amplifier-SOP14-/222302943961?hash=item33c249bad9:g:NFoAAOSwB LlVcsH9


I was looking into these chips today as they are also needed for the Cadet 10 Multiplier. The one linked above is a LT1256. It might be worth noting what I read in the LT1251 documentation:

http://www.linear.com/product/LT1251

"...For control signals of less than 2% or greater than 98%, the LT1251 sets one input completely off and the other completely on. This is ideal for fader applications because it eliminates off-channel feedthrough due to offset or gain errors in the control signals. The LT1256 does not have this on/off feature and operates linearly over the complete control range."

Edit:While impatiently waiting for samples, I built one of the Cadet 10 Multipliers with an SMD LT1256 and a converter board. Seems to work well.
Dirty_Bill
This thread has some info on 1251 vs 1256:

LZX DIY

I've only ever used the 1251s...


makers wrote:
FetidEye wrote:


These are also compatible:
http://www.ebay.com/itm/1PCS-LT1256CS-40MHz-Video-Fader-and-DC-Gain-Co ntrolled-Amplifier-SOP14-/222302943961?hash=item33c249bad9:g:NFoAAOSwB LlVcsH9


I was looking into these chips today as they are also needed for the Cadet 10 Multiplier. The one linked above is a LT1256. It might be worth noting what I read in the LT1251 documentation:

http://www.linear.com/product/LT1251

"...For control signals of less than 2% or greater than 98%, the LT1251 sets one input completely off and the other completely on. This is ideal for fader applications because it eliminates off-channel feedthrough due to offset or gain errors in the control signals. The LT1256 does not have this on/off feature and operates linearly over the complete control range."
FetidEye
SlayerBadger!
I finished my case yesterday (installed power + rails etc)
(a big black millitary flightcase with room for expansion)

So today I've tested the 4 oscillators , the rgb encoder + ramps + processor - everything works!
(apart from some inverted switches and output wiring)

I'm waiting on the LT1251 IC's for the faders, and more banana sockets for the hard key + other processor.. speed up ebay!


I think i've figured out the functions of the processor, but one thing puzzles me: what should the 'thru' connection do?
frankaponte
onurkalaycioglu wrote:

did anyone ever figure out where to buy these individual switches? as the moq is 100. need a couple for the vco pcbs im about to buy. couldnt find anything on mouser that was comparable enough right angle wise.

but i did find these, which should do the trick although they arent right angle. i think the thread width is the same if the hole on the vco panels are similar to the processors panel. strange the datasheet for the 10TF230 doesnt have a thread width or panel mounting drill dimensions.

108-0042-EVX

only place i could find the right part online was some place called swatee electronics. which i think is in the czech republic. but that doesnt really help me as im in chicago... but could help some other wigglers out that way.


I used these (from the latest BOM on LZX site):
10TF230 Switch

-Frank
FetidEye
the LT1251's I ordered from here work!
http://www.ebay.com/itm/371640802567



My whole Cadet system 21 is tested and everything is operational!

The only problem I have now is that the C8 hard key modules give some interference on the signal. Maybe it has to do with the fact that i'm using banana connections (no ground). The other modules have no problems with this though (so far)
sync24
FetidEye wrote:
the LT1251's I ordered from here work!
http://www.ebay.com/itm/371640802567



My whole Cadet system 21 is tested and everything is operational!

The only problem I have now is that the C8 hard key modules give some interference on the signal. Maybe it has to do with the fact that i'm using banana connections (no ground). The other modules have no problems with this though (so far)


thanks for the info on the LT1251's
Dirty_Bill
Curious - has anyone here saved mouser projects/carts for any of the Cadets? I've just been building with parts on hand but it's time to reap for a multi module build...

Thanks

Bill
gzifcak
i didn't save anything on the mouser site but they do have a BOM uploading tool that works pretty well if you just download the spreadsheet, import the LZX BOM and then upload. just confirm that everything uploads correctly, you might have to tweak it.
Dirty_Bill
Yup, I can do that. I was just being as lazy as possible. I'll save US Mouser carts for sharing for my next round of builds.
vonkhades
FetidEye wrote:
the LT1251's I ordered from here work!
http://www.ebay.com/itm/371640802567



My whole Cadet system 21 is tested and everything is operational!

The only problem I have now is that the C8 hard key modules give some interference on the signal. Maybe it has to do with the fact that i'm using banana connections (no ground). The other modules have no problems with this though (so far)


I'm building a cadet21 too.. Wonder g if you can share a pic of you rig I want to know how you arranged everything...

Also I ordered some lt1251 from the ebay store you recommended so I'll tell you more when they arrive.
FetidEye

if needed, i can make a better picture tomorrow.

it's a banana system. but I might change it to jacks because of the ghosting i get + interference.
I made it a bit bigger than eurorack panel size. this fitted better in the case and gave me some room for error
banana color codes: red=video out, blue=cv in, green=video in, yellow=logic
(except for the rgb encoder inputs)

All pots and connectors are wired manually (big knobs and banana plugs)
I wanted some more space to play.

I made all modules dual (the 2 pcb's are sandwiched with standoffs)
the Sync + RGB encoder + Video input is also one module.
Output connectors are BNC

The VCO's have a squarewave mod (I used the extra output on the pcb. you should too!)

In retrospect: my scaler layout sucks. going to change it to 5v on the left and 1v on the right. and I forgot the earth input. this is fixed now.
FetidEye
ps: you can get free samples (no shipping costs) at LT

2 of each.
vonkhades
FetidEye wrote:
ps: you can get free samples (no shipping costs) at LT

2 of each.



That's an amazing build thanks for sharing. I was planning on wiring the Jack's and pots manually of the vco, sync and rgb encoder because they are so tall I want to try to make a skiff briefcase... I'll get Visual Cortex so I'm mixing cadets and expedition on my rig.
vonkhades
FetidEye wrote:

if needed, i can make a better picture tomorrow.

it's a banana system. but I might change it to jacks because of the ghosting i get + interference.
I made it a bit bigger than eurorack panel size. this fitted better in the case and gave me some room for error
banana color codes: red=video out, blue=cv in, green=video in, yellow=logic
(except for the rgb encoder inputs)

All pots and connectors are wired manually (big knobs and banana plugs)
I wanted some more space to play.

I made all modules dual (the 2 pcb's are sandwiched with standoffs)
the Sync + RGB encoder + Video input is also one module.
Output connectors are BNC

The VCO's have a squarewave mod (I used the extra output on the pcb. you should too!)

In retrospect: my scaler layout sucks. going to change it to 5v on the left and 1v on the right. and I forgot the earth input. this is fixed now.



BTW I see you have two outputs on VCO so I guess you wire the Triangle and Square outputs directly from the PCB? There is no minijack output for the square...
vonkhades
Oh and another question for the cadet 9 the VCO, does it matter if I use matched transistors or not? Just trying to know if its worth the pain to manually match them or to buy them already matched...

What do I gain by using matched transistors?
FetidEye
i did not use matched transistors. for one VCO I tried matching but found it to be too much hassle.
If you use external CV on the VCOs you can dial them in much lower than without! (from slow LFO rate to very high frequencies.)

also, I indeed used the square output on the pcb directly. works good!
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