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Old 08-27-2007, 05:46 AM #1
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Default Circuits !

Let's discuss some circuits in this thread - we have circuit discussions in almost EVERY thread out there at present, and it is getting difficult to find all the relevant posts :-) I just figured maybe we can start new threads with the relevant info, and then pop them up as stickies for future use ! It iwll cut down on redundant questions, and make the info a LOT easier to find :-)

So - even though threads may already exist with the info in them - the author/inventor of each circuit - whether they be store bought (roitner, etc) or Daedal's now famous circuits, or the equally impressive, and none the less famous scanner parts lists, and circuits - let's get them organized so we can ALL benefit from one central depository of the info :-)

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Old 08-27-2007, 05:55 AM #2
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Default Re: Circuits !

well to start off, i am currently asking daedal if this circuit will work. http://jaycar.com.au/productView.asp...&SUBCATID=
it uses the LM317T like daedals, but it has a circuit board, and minimal component count. read the description on that link for full info!. i have contacted daedal to see if it will control the GB diodes, because it is a voltage regulator.
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Old 08-27-2007, 06:06 AM #3
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Default Re: Circuits ! Sam Goldwasser's dual 317 supply

I'll add Sam Goldwasser's voltage and current power supply. Both voltage and current are independently adjustable using a pair of LM317's:

http://www.repairfaq.org/sam/laserdps.htm#dpssglt1

In addition, not shown in the schematic, Sam highly recommends adding the following components directly across the laser diode: a parallel combination of a 1K ohm resistor, 0.1 uF capacitor, and reverse polarity fast diode permanently across the laser diode.
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Old 08-27-2007, 06:17 AM #4
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Default Re: Circuits ! circuit for non-reg lasers

Laser Diode Protection when using just a dropping resistor (no regulation). See photo for schematic.

1 Laser Diode
2 0.1 uF low ESR ceramic SMT RS 424-8104 Allied Electronics
3 22 uF 10 V tantalum SMT RS 406-9918 Allied Electronics
4 MURS120 Ultrafast Diode RS 469-0865
5 Memory capacitor or“double layer” cap 0.33F- 1.0 F

** NEVER connect laser diode without discharging circuit first!!**
** Surface mount components are highly recommended.**
**Circuit was suggested in response to usenet inquiries**
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Old 08-27-2007, 06:47 AM #5
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Default Re: Circuits !

Excellent input thus far ! As well as schematics - can you all see if it is possible to post a drawing of the circuit ? What I would like to see for some folks that may be uncomfy with schematics is similiar to this :
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Old 08-27-2007, 07:07 AM #6
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Default Re: Circuits !

just for you all who want an easy way to make small circuits, i use microsoft word, and little thumbnails of the components. here is an example.
if anyone wants the symbols, just ask and i'll send them
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Old 08-27-2007, 07:41 AM #7
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Default Re: Circuits !

Can you email them to me at : stonergl@gmail.com ? Those are handy to have ! :-) Thanks !

G !
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Old 08-27-2007, 07:52 AM #8
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Default Re: Circuits !

you've got mail! let me know if they don't work
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Old 08-27-2007, 08:03 AM #9
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Default Re: Circuits !

Quote:
Originally Posted by things
well to start off, i am currently asking daedal if this circuit will work. http://jaycar.com.au/productView.asp...&SUBCATID=
it uses the LM317T like daedals, but it has a circuit board, and minimal component count. read the description on that link for full info!. i have contacted daedal to see if it will control the GB diodes, because it is a voltage regulator.
Sorry things but I will bet you Daedal will give you basically the same explanation I did. Who do you think spent the most time convincing me a voltage regulator is not a good idea for powering laser diodes..
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Old 08-27-2007, 08:18 AM #10
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Default Re: Circuits !

thats fine gazoo, he said there was a very simple mod i have to do to make it regulate current. i can even still use the same PCB, and cut it down abit.
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Old 08-27-2007, 08:37 AM #11
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Default Re: Circuits !

Speaking of circuits, I found the following circuit interesting. It is a TEC/LD driver all in one:

http://www.repairfaq.org/sam/ssldtd1.gif

Everything we need to start with concerning laser diodes can be found in Sam's Laser Faq:

http://www.repairfaq.org/sam/laserfaq.htm

He provides many examples of circuits that can be easily expanded/modified.
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Old 08-27-2007, 08:39 AM #12
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Default Re: Circuits !

Basic 2 motor spirograph circuit. With the correct variable resistor (VR1) you will be able to stop one of the motors and produce a great number of spiro patterns.

To find the value of VR1 connect the motor to a battery with a multiturn trim pot (5k..ish) Turn resistance right off (motor full speed) wind in the resistance until the motor stops. Disconnect everything and measure the resistance of VR1 with a meter. You will now know the best value for VR1 to get the finest control of motor speed.

Regards rog8811
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Old 08-27-2007, 11:59 AM #13
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Default Re: Circuits !

Quote:
Originally Posted by things
just for you all who want an easy way to make small circuits, i use microsoft word, and little thumbnails of the components. here is an example.
if anyone wants the symbols, just ask and i'll send them
I'd like to have them please ;D I'll send a PM with my e-mail address
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Old 08-27-2007, 11:32 PM #14
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Default Re: Circuits !

ok i think this might be good for a sticky, but i found how to attach the symbols!
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Old 08-28-2007, 12:23 AM #15
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Default Re: Circuits !

Quote:
Originally Posted by SenKat
Excellent input thus far ! *As well as schematics - can you all see if it is possible to post a drawing of the circuit ? *What I would like to see for some folks that may be uncomfy with schematics is similiar to this :


Umm.....I think in your circuit..you have the Capacitor wired correctly...in parallel..but if you place that resistor across the Positive and negative leads...won't all that do is make SPARKS *and SMOKE???

Shouldn't the resistor be inline on the positive lead to drop the incoming voltage to the diode??

LarryQ=Not a Huge electronics guy...but learning as he goes.

I know you're only using it as an example...but if someone uses it thinking it's right...well.......

If I'm wrong in my conclusion...please edumacate me...

Larry
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Old 08-28-2007, 01:49 AM #16
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Default Re: Circuits !

i think the resistor drains the cap slowly just incase the wire comes off the diode, or it could help smooth out the spikes?
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