Reducing voltage from 12V to 9V on power supply
Hi all,
I have a T-Rex Fuel Tank Classic power supply that delivers 3 x 500 mA from three sections, 9V DC, 12V DC and 12V AC. I have exhausted the capacity of the 9V outlets (I only buy 9V pedals as a matter of principle), and so I wonder if there is a simple voltage reducing circuit that I can either put inside, or piggy-back on top of the Fuel Tank. I imagine T-Rex would just ignore me if I sent such a request to their customer support (or at best they would recommend purchasing another T-Rex product). My electronics knowledge is not exactly impressive, but I figure it should be a fairly simple deal to reduce the voltage. Is it just a matter or adding a resistor or two? I just need a simple schematic and parts list. Can anyone help? PS. I know a lot of 9V pedals can handle 12V too, but I don't want to risk anything, so I'd prefer to get the voltage down.
I have a T-Rex Fuel Tank Classic power supply that delivers 3 x 500 mA from three sections, 9V DC, 12V DC and 12V AC. I have exhausted the capacity of the 9V outlets (I only buy 9V pedals as a matter of principle), and so I wonder if there is a simple voltage reducing circuit that I can either put inside, or piggy-back on top of the Fuel Tank. I imagine T-Rex would just ignore me if I sent such a request to their customer support (or at best they would recommend purchasing another T-Rex product). My electronics knowledge is not exactly impressive, but I figure it should be a fairly simple deal to reduce the voltage. Is it just a matter or adding a resistor or two? I just need a simple schematic and parts list. Can anyone help? PS. I know a lot of 9V pedals can handle 12V too, but I don't want to risk anything, so I'd prefer to get the voltage down.
- alexradium
- Resistor Ronker
many pedals work just as well with 12Vdc,mostly dynamics,you have to check out the specs in manuals to find out any problem with higher voltages.Super Locrian wrote:Hi all,
I have a T-Rex Fuel Tank Classic power supply that delivers 3 x 500 mA from three sections, 9V DC, 12V DC and 12V AC. I have exhausted the capacity of the 9V outlets (I only buy 9V pedals as a matter of principle), and so I wonder if there is a simple voltage reducing circuit that I can either put inside, or piggy-back on top of the Fuel Tank. I imagine T-Rex would just ignore me if I sent such a request to their customer support (or at best they would recommend purchasing another T-Rex product). My electronics knowledge is not exactly impressive, but I figure it should be a fairly simple deal to reduce the voltage. Is it just a matter or adding a resistor or two? I just need a simple schematic and parts list. Can anyone help? PS. I know a lot of 9V pedals can handle 12V too, but I don't want to risk anything, so I'd prefer to get the voltage down.
Anyway,you can get 9Vdc easily with a 7809 voltage regulator and 4 caps from the 12Vdc output.
You can do the same with the 12Vac,just inserting a 4 diode bridge rectifier between the output and the aforementioned circuit.(more dissipated energy so you need a heatsink.)
Its everywhere,check out any site like Geofex or General guitar gadgets or Tonepad for complete projects
- tip142
- Breadboard Brother
If you haven't lying around the 7809,simply put for 1n4.... in series and you drop from 12v to 9,2 v quite happily and satisfactory.alexradium wrote:many pedals work just as well with 12Vdc,mostly dynamics,you have to check out the specs in manuals to find out any problem with higher voltages.Super Locrian wrote:Hi all,
I have a T-Rex Fuel Tank Classic power supply that delivers 3 x 500 mA from three sections, 9V DC, 12V DC and 12V AC. I have exhausted the capacity of the 9V outlets (I only buy 9V pedals as a matter of principle), and so I wonder if there is a simple voltage reducing circuit that I can either put inside, or piggy-back on top of the Fuel Tank. I imagine T-Rex would just ignore me if I sent such a request to their customer support (or at best they would recommend purchasing another T-Rex product). My electronics knowledge is not exactly impressive, but I figure it should be a fairly simple deal to reduce the voltage. Is it just a matter or adding a resistor or two? I just need a simple schematic and parts list. Can anyone help? PS. I know a lot of 9V pedals can handle 12V too, but I don't want to risk anything, so I'd prefer to get the voltage down.
Anyway,you can get 9Vdc easily with a 7809 voltage regulator and 4 caps from the 12Vdc output.
You can do the same with the 12Vac,just inserting a 4 diode bridge rectifier between the output and the aforementioned circuit.(more dissipated energy so you need a heatsink.)
Its everywhere,check out any site like Geofex or General guitar gadgets or Tonepad for complete projects
- deltafred
- Opamp Operator
The forward voltage drop of a 1N400x is somewhere around 0.7v so you would need 4 or 5 in series to drop around 3v.tip142 wrote:If you haven't lying around the 7809,simply put for 1n4.... in series and you drop from 12v to 9,2 v quite happily and satisfactory.
New 9v batteries are usually a bit higher, around 9.6v so 4 should be ok but it depends how accurate your 12v supply is. If you are worried then start off with 5 and measure the pedal voltage. Take one out if it is below 9v, add another if it is over 9.6V. I would add a 100uF 16v electrolytic in parallel with 0.1 disc ceramic decoupling capacitors across the 9v output.
Not the most elegant of solutions but it will work.
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
- DrNomis
- Old Solderhand
Information
- Posts: 6807
- Joined: 16 Jul 2009, 04:56
- my favorite amplifier: Self-Built Valve Amp Head :)
- Completed builds: Dallas Arbiter Fuzz Face,Tone Bender Professional Mk 3,Tone Bender 3-Knob,Baja BK Butler Tube Driver,Baja Real Tube Overdrive,Roger Mayer Octavia,EH Soul Preacher,Tech 21 XXL Distortion,MFOS Weird Sound Generator.
- Location: Darwin,Northern Territory Australia
- Has thanked: 98 times
- Been thanked: 279 times
I've actually seen some 9V batteries measure something like about 10V when measured by a multimeter....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
- deltafred
- Opamp Operator
You can but you waste more power because you need a certain current through the zener for it to operate properly (and 9v batteries don't have a lot to waste).bcalla44 wrote:Can't you do it with a 9.1 v zener diode with a resistor in series?
With the 1N400x you only draw the current the pedal draws, a zener needs a few milliamps extra.
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
- mictester
- Old Solderhand
Information
You can, but the resistor will just be wasting energy as heat! Also, zener diodes tend to be a bit noisy.bcalla44 wrote:Can't you do it with a 9.1 v zener diode with a resistor in series?
"Why is it humming?" "Because it doesn't know the words!"