Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 03-18-2014, 12:16 AM #33
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Basic Electronics Questions. AMC7135

The cap adds hysteresis, which prevents the chip's internal error amplifier from over-correcting to small changes in the load and supply. Much like ripples in a pool of water if you add in more energy than the system wicks away then the waves increase in height, so too the amplifier overreacting causes run-away oscillation.

In non or low frequency pulsed DC systems the inductance of the wiring is negligible (other than to cancel out self-capacitance of the wires), if it were a HF AC or fast rise time pulse system the inductance would cause spikes that capacitance can absorb.


__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 03-18-2014, 08:00 AM #34
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by KRNAZNBOY View Post
Schweet. I will hold off on ordering some PCBs until i test my design on a protoboard or something
When you design your board, design it using a schematic in Eagle first. That way you'll be sure your wiring is correct and as you expect. Of course that'll require learning to read and write schematics, but that should be important to learn anyway.

Nothing worse than sending a design off to get fabricated, waiting a couple weeks for it to arrive, and then finding out it doesn't work at all and not even knowing what went wrong or what could have. Then you're stuck with a bunch of useless fiberglass boards that aren't even big enough to be used as coasters.

Plus, on the breadboard you can work out problems such as whether you need extra parts like capacitors to keep down the noise, or whether you really want 2x driver chips instead of just one, or even if the chip you wanted thought you wanted to use really lived up to your expectations. Plus, you'll have a working circuit to troubleshoot the boards against if something does go wrong.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is offline   Reply With Quote
Old 04-05-2014, 02:03 PM #35
jimdt7's Avatar
Class 3R Laser
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
jimdt7 jimdt7 is offline
Class 3R Laser
jimdt7's Avatar
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
Default Re: Basic Electronics Questions. AMC7135

Just got my chips from Fasttech but there seems to be a problem...
Here is my setup:
Vin: 4V
TestLoad-Drop: 3V
1x AMC-7135 Chip
But the output is 220mA...
Same thing happening with a cheap 2x 7135 driver from FastTech. (Vin=4V but Iout=360mA instead of 700mA)
Is this normal?

Jim
__________________
mY lAsErS

Blue-rays
PHR-803t, 117mW Aurora C6
320mW 6x Hotlight

Blues

Bigboy ~2.5W
Labby 1.8W
1.1W in Aurora C6
800mW WL Spyder Arctic G2
Greens
O-like Green Crown 500mW Peak 731mW Chart here
PL520 100mW
Cheap e-bay 25mW and 100mW

Reds
O-like cute 300mW (Dead)

LPMs
Modded Laserbee 2.5W USB

Last edited by jimdt7; 04-05-2014 at 02:04 PM.
jimdt7 is offline   Reply With Quote
Old 04-05-2014, 02:13 PM #36
Zeebit's Avatar
Class 3R Laser
 
Join Date: Aug 2012
Location: PH
Posts: 1,125
Rep Power: 114
Zeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond repute
Zeebit Zeebit is offline
Class 3R Laser
Zeebit's Avatar
 
Join Date: Aug 2012
Location: PH
Posts: 1,125
Rep Power: 114
Zeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond reputeZeebit has a reputation beyond repute
Default Re: Basic Electronics Questions. AMC7135

I had one of those 2xAMC7135 drivers from FT and it had the same problem. I powered it with a single 18650 and hooked it up to a generic 3W led and it was only driving it at around 300mA. I shorted it to my multimeter in Amps mode and its the same thing.

These could be knock-of chips.
Zeebit is offline   Reply With Quote
Old 04-05-2014, 03:48 PM #37
jimdt7's Avatar
Class 3R Laser
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
jimdt7 jimdt7 is offline
Class 3R Laser
jimdt7's Avatar
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
Default Re: Basic Electronics Questions. AMC7135

I'm back with even better results!
AMC-7315 (350mA)---> Vin=4.5V Iout=335mA with 3V Test-Load Drop
"Binned" AMC-7135 (380mA)---> Vin=4.5V Iout= 330mA with 3V Test-Load Drop

Except from these "binned" chips being the same with the regular ones both of them seem to have a Vref of 1.7V....worse than the LM317...total FAIL!

Jim
__________________
mY lAsErS

Blue-rays
PHR-803t, 117mW Aurora C6
320mW 6x Hotlight

Blues

Bigboy ~2.5W
Labby 1.8W
1.1W in Aurora C6
800mW WL Spyder Arctic G2
Greens
O-like Green Crown 500mW Peak 731mW Chart here
PL520 100mW
Cheap e-bay 25mW and 100mW

Reds
O-like cute 300mW (Dead)

LPMs
Modded Laserbee 2.5W USB

Last edited by jimdt7; 04-05-2014 at 03:48 PM.
jimdt7 is offline   Reply With Quote
Old 04-05-2014, 03:57 PM #38
djQUAN's Avatar
Class 3R Laser
 
Join Date: May 2013
Location: Philippines
Posts: 1,128
Rep Power: 559
djQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond repute
Send a message via Yahoo to djQUAN
djQUAN djQUAN is offline
Class 3R Laser
djQUAN's Avatar
 
Join Date: May 2013
Location: Philippines
Posts: 1,128
Rep Power: 559
djQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond reputedjQUAN has a reputation beyond repute
Send a message via Yahoo to djQUAN
Default Re: Basic Electronics Questions. AMC7135

I dunno. The ones I got from FT work just fine.
djQUAN is offline   Reply With Quote
Old 04-05-2014, 04:14 PM #39
jimdt7's Avatar
Class 3R Laser
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
jimdt7 jimdt7 is offline
Class 3R Laser
jimdt7's Avatar
 
Join Date: Feb 2011
Location: Greece
Posts: 1,899
Rep Power: 114
jimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond reputejimdt7 has a reputation beyond repute
Send a message via Skype™ to jimdt7
Default Re: Basic Electronics Questions. AMC7135

Verified my results using a Sanyo 2400mAh 18650 battery just in case...same thing again!
Either there is something wrong with my wiring (too long wires???) or I got a bad batch? :/

Jim
__________________
mY lAsErS

Blue-rays
PHR-803t, 117mW Aurora C6
320mW 6x Hotlight

Blues

Bigboy ~2.5W
Labby 1.8W
1.1W in Aurora C6
800mW WL Spyder Arctic G2
Greens
O-like Green Crown 500mW Peak 731mW Chart here
PL520 100mW
Cheap e-bay 25mW and 100mW

Reds
O-like cute 300mW (Dead)

LPMs
Modded Laserbee 2.5W USB

Last edited by jimdt7; 04-05-2014 at 04:15 PM.
jimdt7 is offline   Reply With Quote
Old 04-05-2014, 11:56 PM #40
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Basic Electronics Questions. AMC7135

I doubt it is your wiring or wire length. Most probably they are knock off chips, which is common.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:49 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC