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Hello All,
These days it is possible to get G120D galvos for good price I think.
I have got pair of these few years ago and wanted to build
my own driver for it, becasue my budget for lasershow was(is) limited :(
I think I was quite successful :)
Results can be seen on my web: www.technoroam.sk/lasershow
Has anybody skills in building galvo amps for G120D ?
Best Regards
pishtak
your drivers look PRO!
nice toys!!!
Hello there,
Some friends in Germany reproduced "my" design.
They achieved even a bit better speed than me.
Almost 12 driver pairs are being built now by other "freaks" :-)
Details in german language are here:
http://www.laserfreak.net/forum/view...37470&start=50
ildatestb.ild runs @ 40degress at 30-35Kpps
(depending on how "good" are the galvos :-)
regards
pishtak
Greetings guys. You may want to edit you mail eddress. Spam Bots smell them and then you end up with all these cans of prosessed meat in your inbox... It is never a pretty site. ;)Quote:
Originally Posted by Angelillolaser
Welcome to the forum! :D
hello,
here is update to G120Amp. there are some improvements available.
at the moment not fully tested, but i hope i'll have some time to test it soon.
most important is to test functionality of h-bridge.
improvements:
- high frequency damping removed (i think it is not necessary for G120 galvos)
- input stage is simpler
- pre-emphasis is moved to input
- output stage modified to h-bridge (two power opamps are now necessary)
- part count is reduced (one quad opamp removed)
- external shutdown implemented
- jumper to open the loop (setting/tunning without soldering/desoldering)
- postion signal is buffered (U7D)
G120Amp should be now faster :-)
Big thanks to mixedgas who provided idea about how to implement h-bridge.
It is so simple and usually one overlooks such easy solution even
you have it before your eyes (modified howland current source plus inverting amp)
PS: looking for at least 2pcs G120 galvos in very good condition. long
time ago finalphase2 at ebay was selling plenty of them for very good
price (G120 with thermal blanket and RJ45 connector = G120ST).
best would be to get 4pcs of these :-)
Best Regards
pishtak
nice, you going to offer boards?
have some G120's I would love to use but have miniSAX amps (aka crap)
also where did you get those mounts for the G120's?
as i'll let produce new boards for myself (min 4pcs), i can probably order more pieces
if somebody is interested. first of all i need to test it.
which mounts do you mean ? mirror mounts or galvo mounts ?
the galvo mounts
I would be interested in a set of boards if they are reasonably priced?
Flecom,
Those mounts look like holders for CNC rails.
Something like this... (these are available in different sizes and configurations)
You can also make them yourself... shouldn't be to hard.
http://www.ebay.com.au/itm/SK12-12mm...-/110651162545
galvo mounts are home/hand made.
if i'll be supplying PCBs, these will be unassembled (only raw pcb).
price will depend on demand.
i'll wait for feedback here and also on laserfreak
if any one needs 120 amps i have a whole box of these
AMPLIFIERS & INTERFACE CARDS
CLA-1000 Closed Loop Amplifier Card
The CLA-1000 is the single channel closed loop amplifier card for use with older GS138/128 galvonometers. The amplifier allows full control of the all scanner operational parameters including scanning amplitude, scanning offset, position feedback and velocity feedback. The amplifier is short circuit protected and includes a inline fuse for additional protection of the scanner. The scanner may be switched on and off line at any time for alignment. The amplifier accepts input signals from both balanced or single ended inputs. Power requirements are 18 to 25 volts DC for operation and all supply voltages are regulated on the board. The 6" x 4.5" fiberglass circuit board which plugs into a 22/44 pin-edge card connector and is compatible with industry-standard card cages.Use the CLI-1000 card below to facilitate wiring a modular system. A detailed specification sheet is available.
CLI-1000 Closed Loop Interface Card
The CLI-1000 interface card is designed to simplify the wiring of a CLA-1000 based system by including all I/O on a plug in card. Input grounding is optional. A detailed specification sheet is available. The card brings the signal inputs and scanner outputs up to the front of the card cage allowing amplifier cards to be bussed easily in a card cage. Input to the card is by a standard 5 pin DIN connector. Inputs may be balanced or unbalanced with signal phase selectable by the dip switches. Ground lift is also supported to prevent ground loop hum. Outputs are via a standard "galvo ready" female DB-15 connector. The 6" x 4.5" fiberglass circuit board which plugs into a 22/44 pin-edge card connector is compatible with industry-standard card cages.
what KPPS will they do?
he's getting 24kpps with home-made amps, pretty impressive since AFAIK only the turbo-tracks got higher (30kpps)
please keep this thread related to currently discussed home developed/made galvo amp and G120 galvos. thanks :-)Quote:
Originally Posted by VJ AIWAZ
im not sure of the speed but i can look up the data
basically i have never used them my company technological artisans usta produce these before i was involved with the company but i do have all the schematics and data for these some where in a draw
two versions are being build
G120Amp9 (with 1pc OPA2544 as output stage)
G120Amp10 (with 2pc LM3886 as output stage)
best regards
pishtak
Refer to file G120Amp10_SCH_15112011.
Load: G120D with torsion bar removed serves as test load (LL=1mH RL=2Ohm).
Power Supply: +/-20VDC
FullStep1.jpg:
CH1 = current through load measured on R7=0.47R sense resistor.
positive current amplitude 2.17A, negative current amplitude 2.38A.
4.55App(peak to peak) developed in load in 75us.
Input signal as can be seen on picture FullStep3.jpg.
3.4App current can be developed in 40us.
FullStep2.jpg:
Output voltages of the h-brdige.
CH1 voltage on U1 pin3. CH2 voltage on U7 pin3.
FullStep3.jpg:
CH1 maximum possible input signal VSUM which can be delivered
from U2C pin 8.
Warning:
these are absolute maximum values and this will never
happen in normal operation. it was just used to test stability
and performance of h-bridge.
G120Amp10 is working. ILDA Test Pattern is running well 24Kpps @ 20° optical (+/- 10°).
Parts CC,RC,CN,RN mentioned in enclosed schematics must be added to PCB according enclosed picture.
H-Bridge is stable. Details about design in enclosed simulation using TinaTI (free).
pishtak
PS: PCB layout will be not released. I can provide unassembled PCBs if anyone is interested.
ilda test pattern running 28Kpps @ 8° optical (+/- 4°) doesn't look bad,
but if you look at X and Y pulses, there is little over and undershoot visible.
pishtak
it still looks very very impressing to me, keep it up man!!!!
Hi,
I AM interested in your CLA-1000 boards - how much are you are you asking for a pair? Call me (much easier and faster than endless typing) Warren (808) 723-4288 Thanks!
You are great. I am from Turkey. Thanks
so.... anybody has any G120 for sale?