ULTRA clean 9VDC Power Supply Project - Page 2 - Electronic Circuits Projects Diagrams Free

gramo · 6th April 2007, 05:41 PM

Looks good!

Peter_wadley · 7th April 2007, 01:51 AM

Total Cost for me: (CDN Funds)

-Enclosure: $10.00
-12v Fan: $7.00
-Transformer: $12.00
-2x SPST switches: $7.00
-2x grommets: $1.00
-3x DC coaxial jacks: $2.50 x 3: $7.50
-3 Pairs of DC plugs: $3.00
-Copper Board: $4.00
-Gloss Black Paint $4.00
-Nuts and screws: $1.00
-Rubber Feet: $1.00

Components:
Resistors, Capacitors, diodes and LED: $5.00
LM317: $1.50
Bridge Rectifier: $2.50
Fuse w/ holder (not needed): $3.00

Total CDN: $69.50
Total USD: $60.00

Originality comes at a hefty price.. Definately not economical.. but im sure if you look harder you will be able to find things alot cheaper..

Zed · 9th April 2007, 04:41 PM

OK. The fan is deffo not needed for this project.
In fact you could put a series regulator powering 3 guitar effect pedals in a domestic oven at 50 degrees centigrade and it will still power 3 pedals.
A wall wart psu for 10 pedals and possibly more can be easily constructed.
If you go down the SMPSU route you can get several amps of DC at 10 volts EASY.

Peter_wadley · 9th April 2007, 07:03 PM

Quote:

Originally Posted by Zed

OK. The fan is deffo not needed for this project.
In fact you could put a series regulator powering 3 guitar effect pedals in a domestic oven at 50 degrees centigrade and it will still power 3 pedals.
A wall wart psu for 10 pedals and possibly more can be easily constructed.
If you go down the SMPSU route you can get several amps of DC at 10 volts EASY.

Yeah, I suppose the fan is a bit overkill.. o well it looks cool and I enjoy a nice gently breeze on my face when Im playing.

Also it acts as a hand dryer.. much the same as those found on bowling turnstiles.

This power supply could manage 10 pedals.. if I mounted 7 more coaxial jacks.

Thanks for the feedback
Peter Wadley

Ambient · 9th April 2007, 07:47 PM

The reason why the lm317 is getting so hot is that it has to dissipate the extra Watts. The regulator is reducing the output voltage to 9V, but if you have a 25V transformer it has to dissipate all the extra voltage and current. So it generates heat.

Just thought I'd clear that up for you, I did not notice anyone tell you why to go with a lower voltage transformer.

Zed · 9th April 2007, 09:04 PM

I was just thinking that an even better idea would be to use a fixed 9 volt regulator like a TS7809CZ as well as a lower secondary voltage transformer.
You could ditch the fan which will prolly induce electrical noise into the DC output anyhow.
It would reduce the component count and the cost too.

http://www.maplin.co.uk/module.aspx?...5&doy=9m4#spec

Peter_wadley · 10th April 2007, 02:20 AM

Quote:

Originally Posted by Ambient

The reason why the lm317 is getting so hot is that it has to dissipate the extra Watts. The regulator is reducing the output voltage to 9V, but if you have a 25V transformer it has to dissipate all the extra voltage and current. So it generates heat.

Just thought I'd clear that up for you, I did not notice anyone tell you why to go with a lower voltage transformer.

Hey Ambient,

The LM317 was getting hot with the 25v (actually it was @ 35v!!) transformer... Hero999 addressed this and told me to use the center tap (12v).. the LM317 does not change temperature while in operation now.

The reason I added the fan is because the heatsink would not fit inside the box.. just as a precaution .. and to ensure optimum life of all parts.

Quote:

mneary: A suggestion: If the project is to go into an enclosure, you should begin there. It's easier to change the parts locations on the board before you etch it.

Point taken.

Quote:

You could ditch the fan which will prolly induce electrical noise into the DC output anyhow.
It would reduce the component count and the cost too.

Yes you are correct, when the fan is turned on through my homemade (unfiltered pedal) you can hear noise.. that is why the red SPST button was added.. its used to turn the fan off when operating that particular pedal..

Thanks and keep up the constructive feedback - it will save others much time and money in the future

Peter Wadley

Hero999 · 11th April 2007, 10:03 PM

I'm glad to see you're finishing it properly.

I suppose a fan isn't required but it's often a good idea especially if you want to use it to power higher current loads than your guitar pedals.

You could have probably purchased a cheaper supply for far cheaper though it's been well worth making it as the experiance you've gained it priceless.

Peter_wadley · 15th April 2007, 01:54 AM

Hey Hero,

Just wanted to let you know that I tried the Laser Copier PCB method you pointed out earlier and it worked GREAT!

I will NEVER hand draw a PCB again!

Ive added a few pics below.

It took 2 tries to get the iron temperature right.. I set it to about 50% and ironed for 5 minutes.. peeled off nicely..

I have a question about etching though..

This time I heated the ferric chloride (I HATE THIS STUFF) and the etching went alot faster.. On the bottle it says to not heat past 55c... I went to 70c at one point.. I was just wondering if anyone knows if I was breathing poisonous fumes at that point..

if that makes sense..

Can someone PLEASE show me an alternate to FeCl!!! I cant stand the stuff! It smells like metallic blood, stains everything yellow, etchs VERY slowly, and makes my sink look awful!!

I just want maybe like a powder that I can add water too and it will be ready

Thanks,
Peter Wadley

Hero999 · 15th April 2007, 02:57 PM

Looks iumpresive.

I use Prees 'n' Peel etching crystals it says sodium persulphate and sodium bisulphate on the container but I'm not sure what proportions.

What paper did you use?

I use magazine paper because it's a free recycled material but I've been told that some of the more expensive proprietary papers are better.

gramo · 15th April 2007, 03:03 PM

Hmm, breathing that stuff is bad juju

Grab a etching tank like this

http://www.altronics.com.au/index.as...=item&id=T3201

That one is a little over priced, but you ge tthe idea..you could even build your own with a fishtank pump..

Put that near a window (where it wont get hit by curtains/pushed over by wind), and let it do its thang for a while

Peter_wadley · 15th April 2007, 04:58 PM

Quote:

Originally Posted by Hero999

Looks iumpresive.

I use Prees 'n' Peel etching crystals it says sodium persulphate and sodium bisulphate on the container but I'm not sure what proportions.

What paper did you use?

I use magazine paper because it's a free recycled material but I've been told that some of the more expensive proprietary papers are better.

I designed the PCB with this program:

PCB Designer

What programs do you guys use to design your PCBs? This one is alright but the trial version does not let you print! So I had to print screen and print it with paint. shhh

I printed it off on my inkjet canon primus then took it over to my mothers laser copier.. set the contrast to 100% to make the lines as toned as possible.. hit copy then cut it out .. placed it on the pcb then you know the rest.

The paper from the copier is just normal A4 sheets also!

As for the etchant.. ammonium persulphate is exactly the one I am after.. it is used in the tutorial I used for making my laser PCB:

Check Picture in this link

That is exactly what im looking for ... no fuss and no cuss.. just add the powder and swirl around.. hopefully my electronics store carries this!

Quote:

Originally Posted by gramo

Grab a etching tank like this

No more FeCl for me please

Sceadwian · 15th April 2007, 07:07 PM

I suddenly feel about 30 years older because the focus on those pictures is so bad =) Nice results though.

Peter_wadley · 15th April 2007, 07:15 PM

Could be worse.. could be a camera phone :|

Edit: Aren't wolves supposed to have keen senses? :P

Hero999 · 15th April 2007, 07:17 PM

Quote:

Originally Posted by Peter_wadley

The paper from the copier is just normal A4 sheets also!

No special paper, just normal A4 copier paper!

I'm not surprised at all. I had a feeling that it would work with normal paper but I suppose I'll carry on using magazine paper because it costs nothing and plain A4 paper is relatively expensive.

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6th April 2007, 05:41 PM	#16
gramo	Looks good! __________________ digital-diy.com - Hobby microcontroller projects and tutorials. Assembly, PICBasic and C examples.

7th April 2007, 01:51 AM	#17
Peter_wadley	Total Cost for me: (CDN Funds) -Enclosure: $10.00 -12v Fan: $7.00 -Transformer: $12.00 -2x SPST switches: $7.00 -2x grommets: $1.00 -3x DC coaxial jacks: $2.50 x 3: $7.50 -3 Pairs of DC plugs: $3.00 -Copper Board: $4.00 -Gloss Black Paint $4.00 -Nuts and screws: $1.00 -Rubber Feet: $1.00 Components: Resistors, Capacitors, diodes and LED: $5.00 LM317: $1.50 Bridge Rectifier: $2.50 Fuse w/ holder (not needed): $3.00 Total CDN: $69.50 Total USD: $60.00 Originality comes at a hefty price.. Definately not economical.. but im sure if you look harder you will be able to find things alot cheaper.. __________________ "Stick around" - Arnold Schwarzenegger in The Predator after impaling a soldier to a wood post 9vDC Guitar Pedal PSU PIC16F84a Game Module

9th April 2007, 04:41 PM	#18
Zed	OK. The fan is deffo not needed for this project. In fact you could put a series regulator powering 3 guitar effect pedals in a domestic oven at 50 degrees centigrade and it will still power 3 pedals. A wall wart psu for 10 pedals and possibly more can be easily constructed. If you go down the SMPSU route you can get several amps of DC at 10 volts EASY.

9th April 2007, 07:47 PM	#20
Ambient	The reason why the lm317 is getting so hot is that it has to dissipate the extra Watts. The regulator is reducing the output voltage to 9V, but if you have a 25V transformer it has to dissipate all the extra voltage and current. So it generates heat. Just thought I'd clear that up for you, I did not notice anyone tell you why to go with a lower voltage transformer.

9th April 2007, 09:04 PM	#21
Zed	I was just thinking that an even better idea would be to use a fixed 9 volt regulator like a TS7809CZ as well as a lower secondary voltage transformer. You could ditch the fan which will prolly induce electrical noise into the DC output anyhow. It would reduce the component count and the cost too. http://www.maplin.co.uk/module.aspx?...5&doy=9m4#spec __________________ ''It was working when it went out''

11th April 2007, 10:03 PM	#23
Hero999	I'm glad to see you're finishing it properly. I suppose a fan isn't required but it's often a good idea especially if you want to use it to power higher current loads than your guitar pedals. You could have probably purchased a cheaper supply for far cheaper though it's been well worth making it as the experiance you've gained it priceless. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

15th April 2007, 02:57 PM	#25
Hero999	Looks iumpresive. I use Prees 'n' Peel etching crystals it says sodium persulphate and sodium bisulphate on the container but I'm not sure what proportions. What paper did you use? I use magazine paper because it's a free recycled material but I've been told that some of the more expensive proprietary papers are better. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

15th April 2007, 03:03 PM	#26
gramo	Hmm, breathing that stuff is bad juju Grab a etching tank like this http://www.altronics.com.au/index.as...=item&id=T3201 That one is a little over priced, but you ge tthe idea..you could even build your own with a fishtank pump.. Put that near a window (where it wont get hit by curtains/pushed over by wind), and let it do its thang for a while __________________ digital-diy.com - Hobby microcontroller projects and tutorials. Assembly, PICBasic and C examples.

15th April 2007, 07:07 PM	#28
Sceadwian	I suddenly feel about 30 years older because the focus on those pictures is so bad =) Nice results though. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

15th April 2007, 07:15 PM	#29
Peter_wadley	Could be worse.. could be a camera phone :\| Edit: Aren't wolves supposed to have keen senses? :P __________________ "Stick around" - Arnold Schwarzenegger in The Predator after impaling a soldier to a wood post 9vDC Guitar Pedal PSU PIC16F84a Game Module