Analogguru - Split Supply from 9V

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
Post Reply
User avatar
KHELSTROM
Solder Soldier
Information
Posts: 205
Joined: 06 Sep 2007, 15:30
Has thanked: 2 times
Been thanked: 6 times

Post by KHELSTROM »

RLBJR65 wrote:I'm almost done putting it together. Couple days until I can get back to it though.
Did this layout (obviously untested)
https://img213.imageshack.us/img213/1772/avgmka1.gif
For some reason I can't get the pic to size right in ImageShack :scratch:
I can Email the original if someone wants to try it.
Hi RLBJR65,
Did you ever get this up and working to verify it? This is exactly what Ive been looking for.
Top
User avatar
seniorLoco
Resistor Ronker
Information
Posts: 343
Joined: 05 Nov 2007, 09:43
Location: ASIA
Been thanked: 11 times

Post by seniorLoco »

Thanks AG ... btw can i just use the +15v to power my ol' MXR Flanger ?
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."
Top
User avatar
analogguru
Old Solderhand
Information
Posts: 3238
Joined: 26 Jun 2007, 13:58
Been thanked: 123 times
Contact:
Contact analogguru

Post by analogguru »

seniorLoco wrote:Thanks AG ... btw can i just use the +15v to power my ol' MXR Flanger ?
I think it will not deliver enough current to do so.

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
Top
User avatar
KHELSTROM
Solder Soldier
Information
Posts: 205
Joined: 06 Sep 2007, 15:30
Has thanked: 2 times
Been thanked: 6 times

Post by KHELSTROM »

Will it work for a MN3005 analog delay I'm working on which runs off +/- 15VDC? How much current can this handle?
Top
User avatar
RLBJR65
Resistor Ronker
Information
Posts: 280
Joined: 30 Jun 2007, 16:07
Location: USA
Been thanked: 3 times
Contact:
Contact RLBJR65

Post by RLBJR65 »

No my perf build had a couple errors. I got involved in some home improvement projects and never debuged it fully. About time to dig it out again I suppose.

Couple other methods to try. https://img166.imageshack.us/img166/627 ... plycg1.gif
Top
User avatar
bajaman
Old Solderhand
Information
Posts: 4512
Joined: 26 Jun 2007, 21:18
Location: New Brighton, Christchurch, NZ
Has thanked: 566 times
Been thanked: 2014 times

Post by bajaman »

Okay
I just built analogguru's +15vdc and -15vdc from a +9v power supply (9v switchmode power supplies are cheap and plentiful these days - at least where I live!!)
I used a +9vdc 1300mA switchmode adaptor - unloaded it measures 10vdc.
I used standard 10uf 25v aluminium electrolytics and 1N4148 diodes, polyester 100v film caps and non mojo metal film resistors :wink:
I measured +21vdc and -21vdc at the output terminals - no effect connected -The current draw measures 12mA.
I made a simple circuit with a TL082 opamp - a non inverting buffer followed by an inverting gain stage.
I connected the circuit to the power supply using 100 ohm series resistors - the measured voltages at the op amp supply rail pins was +18vdc and -14vdc approximately. I checked the supply current draw - 28mA, however the voltage drop of 0.4vdc across each of the 100 ohm resistors means the dual opamp TL082 is only drawing 8mA total current.
Not sure why the -ve rail is 4vdc lower than the positive rail though.
The next step is to see how or if it can feasibly power up 3 TL084 quad opamps.
I will keep you all posted, but initially this looks good - thanks to analogguru once again :applause:
bajaman
be kind to all animals - especially human beings
Top
User avatar
soulsonic
Old Solderhand
Information
Posts: 3880
Joined: 27 Jun 2007, 03:38
my favorite amplifier: Traynor YVM-1
Completed builds: too many!
Location: Morgantown, WV
Has thanked: 179 times
Been thanked: 458 times
Contact:
Contact soulsonic

Post by soulsonic »

I had built this a couple times on breadboard... seemed to work alright for me. Last time I tried, I was able to power a couple dual opamps and got the voltages I expected. I used a CMOS 555.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
Top
User avatar
RnFR
Old Solderhand
Information
Posts: 4880
Joined: 09 Jan 2008, 06:02
my favorite amplifier: Traynor YBA-III, Fender Super Six
Completed builds: custom fuzz.
Location: Inner Earth
Has thanked: 139 times
Been thanked: 133 times
Contact:
Contact RnFR

Post by RnFR »

soulsonic wrote:Why don't I just come up with a generic supply and call it the "Voltage Cunt"? EUR 300. Offensive names make them work better and give me an excuse to charge double the price.
:lol: :lol:

i think i've found my new band name.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO
Top
User avatar
Fuzzer
Diode Debunker
Information
Posts: 982
Joined: 16 Sep 2007, 15:17
Been thanked: 21 times

Post by Fuzzer »

:D :lol: :lol: :lol: :lol: Voltage Cunt. How do you probe it?
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
Top
User avatar
soulsonic
Old Solderhand
Information
Posts: 3880
Joined: 27 Jun 2007, 03:38
my favorite amplifier: Traynor YVM-1
Completed builds: too many!
Location: Morgantown, WV
Has thanked: 179 times
Been thanked: 458 times
Contact:
Contact soulsonic

Post by soulsonic »

Fuzzer wrote::D :lol: :lol: :lol: :lol: Voltage Cunt. How do you probe it?
With the Current Cock, of course! :lol:

Oh man, I am so crude. I apologize to anyone offended by my potty mouth. :lol:
You know how it is, when you're hanging out with the guys, and you forget there might be children or ladies around. :oops:
:P

:lol:
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
Top
User avatar
Fuzzer
Diode Debunker
Information
Posts: 982
Joined: 16 Sep 2007, 15:17
Been thanked: 21 times

Post by Fuzzer »

I'm not offended, not at all. :applause: :applause: :mrgreen:
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
Top
User avatar
floris
Cap Cooler
Information
Posts: 472
Joined: 14 Oct 2007, 12:05
Has thanked: 230 times
Been thanked: 72 times

Post by floris »

Sorry to drag you back to the battery vs adapter debate with an "old tale" but:
When I powered my effects (Flatline comp, BluesBreaker OD, PT80 delay, SHO boost) with the 9V 1Spot adapter (or another adapter) I got quite a bit of noise in my signal.
Using only batteries, this was lowered so much it became very hard to notice.
Then I made some simple lowpass filters in the power-supply lines of the effects (100 ohm with 100uF) and since then the noise floor using the adapter is only slightly higher than using batteries. I can hardly notice the difference anymore.
So, power supply decoupling and filtering is important especially when using digital/clocked/LFO stuff (delay, chorus, flanger) in combination with high gain effects (dist, OD, boost).
Top
User avatar
Tube2stomp
Breadboard Brother
Information
Posts: 63
Joined: 14 Dec 2007, 12:53
Been thanked: 3 times

Post by Tube2stomp »

bajaman wrote:Okay
I just built analogguru's +15vdc and -15vdc from a +9v power supply (9v switchmode power supplies are cheap and plentiful these days - at least where I live!!)
I used a +9vdc 1300mA switchmode adaptor - unloaded it measures 10vdc.
I used standard 10uf 25v aluminium electrolytics and 1N4148 diodes, polyester 100v film caps and non mojo metal film resistors :wink:
I measured +21vdc and -21vdc at the output terminals - no effect connected -The current draw measures 12mA.
I made a simple circuit with a TL082 opamp - a non inverting buffer followed by an inverting gain stage.
I connected the circuit to the power supply using 100 ohm series resistors - the measured voltages at the op amp supply rail pins was +18vdc and -14vdc approximately. I checked the supply current draw - 28mA, however the voltage drop of 0.4vdc across each of the 100 ohm resistors means the dual opamp TL082 is only drawing 8mA total current.
Not sure why the -ve rail is 4vdc lower than the positive rail though.
The next step is to see how or if it can feasibly power up 3 TL084 quad opamps.
I will keep you all posted, but initially this looks good - thanks to analogguru once again :applause:
bajaman

Bajaman,
A bit oldie post but have you found the problem?
Tested how much current it can supply?
Cheers mate
Top
User avatar
Barcode
Diode Debunker
Information
Posts: 820
Joined: 27 Sep 2007, 17:03
Has thanked: 14 times
Been thanked: 32 times

Post by Barcode »

I assume by removing a diode and cap pair from each side this would provide ~-/+9V? I use Max1044 a lot to allow positive ground circuits to function on the same power supply as my negative ground fx, and I think I'd prefer this alternative...
Top
User avatar
mozwell
Breadboard Brother
Information
Posts: 112
Joined: 11 Mar 2009, 23:01
my favorite amplifier: home made SVT2
Completed builds: baja tube driver, several TS variants, Sansamp GT2, Ross Comp
Location: Melbourne, Australia
Has thanked: 22 times
Been thanked: 66 times

Post by mozwell »

Sorry to ressurect this old thread.....
A word of caution... Some op amps (TLC2262 etc) will not run from +/-15V
They have a maximum limit of +/-8V only, and are recommended for +/-5V supplies.
4000 series CMOS has a maximum of 18V, and will run ok up to 15V supplies

Always check the capacitors, ic's, op amps & transistors in any circuit are ok at higher voltage before just increasing the supply voltage.
Top
User avatar
Barcode
Diode Debunker
Information
Posts: 820
Joined: 27 Sep 2007, 17:03
Has thanked: 14 times
Been thanked: 32 times

Post by Barcode »

bump for my question...
Top
Post Reply

Return to “DIY Projects”