I'm trying to build a power supply almost identical to this AMZ one:
The only difference to mine is I'm not putting in the -9v supply.
I've made it up on a vero and it seems to work fine, but when I put it into its case (which is metal) it basically self destructs frying the IC's and caps etc.
So my question to the more experienced is, how should I be loading this into the metal case? This is a run down of my approach:
Input: 19V Laptop power supply (centre positive) going...
Im a looking for some help :( .
I am building a few SDD-3000 pre-amps from the the design found on
I have the PCB designed apart from the power supply which uses a 9volt power supply.
The oringinal SDD-3000 used a 15v power supply,so I am wounding is there a low cost 9v to 15v converter or circuit that I could use?
I found the following page but i cant find the LT3467's and as im new to this Im not sure if its what I need.
The finished SDD PCB has to fit in a hammond 125 enclosure...
I did a search but I could not find a reassuring answer.
I think I figured out the positive/negative ground thing.
Let's say I want to build an octavia:
And I want to be able to switch transistors NPN and PNP versions.
To make this switch I have to:
Change the voltage supply (in my case switch the DC jack so + becomes - and visa versa)
Change all components affected (Diodes and Elco's)
Do I have to change the Germanium Diodes (1N34A)? On the fuzzcentral schematics they do not...
This is my very first post, and I am looking forward to opening a dialog with the freestompboxes community. My question is: What is the best way to add a switch to change a pedals power from a negative ground 9V supply to a positive ground 9V supply? I would like this to be incorporated into a 9V battery powered pedal with a 2.1mm kobiconn jack. I use a solder lug washer around the power jack for a chassis ground connection from the board as well if that makes a difference. The powering scheme...
I recently put in a switchable DC power jack into my cloned Fulltone OCD, and came across an odd issue.The pedal works 100% fine using just the battery, without an adapter plugged in. The LED also lights up when the adapter is plugged in, but turns off as soon as I plug in either the input or output of the pedal.
Since the input and output shouldn't affect the power state of the pedal, to me, it seems to be a grounding issue. Other pedals work on the power supply, the pedal is both expecting...
I've been searching the web for simple step by step way to measure input and output impedance of my builds. Needless to say, i didn't find any documentation that i could understand and use straight away.
Gaussmarkov has written a nice article about this:
But. My experience and know-how is still quite limited regarding basic/advanced electronics. From the article above: All we need is a steady AC source. Don’t have one? Guess what? You probably have the parts to build...
I have some questions, and hopefully there is a composite answer here.
I have a moderate amount of experience with elec theory. No schooling, just learning as an interest. In the past I messed with fan control circuits for my pc, and dabbled in some other things like DAQ stuff. Last year I decided maybe I would like to play a musical instrument, so I started messing with a guitar. One thing led to another, and now I am making amps, mainly those from RunOffGroove and the cMoy. I am...
Hey guys, I'm putting together a treble booster as seen here:
I'd like to have the option of powering it by battery or an adapter, so I'm going to follow this diagram to wire it up:
I've never actually done this before though, so just to make sure I get it right, would this socket be the right one to use? Its the sixth item down on this page:
Would this be suitable? Thanks very much for any help you can give me!
I'm trying to build a Pearl ph-01 phaser from a schematic diagram (below) and I need a bit of help to pull the whole thing together. There are arrows pointing up and arrows pointing down and I'm trying to figure out in what sense the two are meant to be kept separate, i.e if the arrows pointing up are all connected to +ve where are the arrows pointing down supposed to be connected to?
In the image below, I believe the diode and capacitor are there to protect the circuit from too high a voltage coming from the DC power source (correct?). My question is what is the exact purpose of the diode and the capacitor are, and why were they specifically chosen?
I am finishing up the design of my DIY power supply and I wanted to run some of my design thoughts with the forum for some feedback/confirmation that I doing this correctly.
1) I am thinking of mounting two Weber WPDLXFMR-1 transformer (8 11vac windings and 1 9vac winding) in my chassis. I was planning on running the primary windings in parallel from the 120v main to power the two transformers.
2) I would like to have 18v for one of the dc outputs, so I was thinking that after the legs get...
Hey so I've never dug into charge pumps at all and couldn't really find a good explanation on the real purpose behind them. So question are; What are the uses? Benefits? Is it simple to run positive ground pedals from a negative ground supply? Anyways haha any input is fantastic! Thanks!
Wondering if anybody can help, I have the following ground wire (just by the strip of wood) that I assumed would need to be connected to the casing so originally was attached to the screw on the handle however this creates a horrible buzzing when the guitar is plugged in, does anybody know where I should be attaching it instead?
I was looking at different Tube Screamer schematics (such as this one ) and noticed that the virtual ground is obtained with a simple voltage divider.
Broadly speaking, this is not optimal.
Hence my question: would the TS benefit from a better virtual ground (as presented here )? Would it even be affected in any way?
I'm planning to use a 19v 3.4amp laptop power supply for my pedals. I will use LM317 and/or 7809 for regulation to suitable voltages(18v and 9v). Won't the high current fry the regulators because I see 1amp as the common current for pedal supply sold and DYI'd.
Here's something i came across a while ago & thought i would share it here.
Its from an australian magazine, and is an easy way to generate 250VDC from a 12VDC input supply.
I hope its of some use..... :D
I dont have pcb's available. It should be easy enough to prototype though.
hello
maybe this case has been asked a million of times but..
which is the correct way to connect the case and the ground of the schematic??
some people just seem to connect it directly.. others use a 100ohm resistor and a 10nF capacitor.
I'm building my first PNP circuit (a Toecutter), and obviously I'll have to wire it differently. I want to use an ordinary 9v power supply, and came accross a couple of wiring diagrams at General Guitar Gadgets that seem to fit the bill:
What I want to know is, whats the difference between these? In simple terms if possible.
Am I the only person that get's incredibly annoyed when barrel connectors are wired center-negative versus, the more standard, center-positive? :evil:
Scammm alert.
I think I'm mostly annoyed because I just received a catalinbread pedal that requires the center-negative and I don't have one. I prefer batteries. Of course, if it was wired the right way I could find a half dozen wall-warts that would do the job just laying around the house.
I am building a simple pedal board consisting of one TS-9 Tube Screamer and one AD-80 Analog Delay. The TS-9 requires 9VDC while the AD-80 requires 18VDC. My wall voltage is 120VAC and I would like to build a single power supply box to feed both pedals. What is the best way to accomplish this?
I am thinking about using a Hammond 164H20 (115VAC to 20V CT @ 1A), then full wave rectifier, big filter cap, then split to a 7818 and 7809.
A few years ago, I successfully built a simple regulated...
Does anyone have experience with those enclosed 9v battery cases that allow you to change the battery without opening the enclosure? If so, I'm curious about what tool you use to cut out the rectangle for the battery enclosure... One of those nibbler tools maybe? I know you could do it with a jigsaw but that just seems like a hassle (plus i don't have one).
First, thanks to analogguru for this schematic: ... iplier.gif
I did it and it works well until it is open (no connections/supply to main circuit)
As I use it to powering a IC (TL072) for dual supply the charge pump vanish the effect....
So I'm wondering it is designed for Transistor use or there is any special trick I can take for let it working with ant Op-Amp. ??
How could I wire up two 9v batteries to supply 18v to an Toneczar Openhaus? I checked, and I can fit two 9v batteries in the enclosure. Thanks for the help!
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