Got a request for an active DI, which coincided with a project I'm working on, so it seemed like a good idea. This one's designed by Samuel Groner and modified by Jack Orman. The schematic came from his blog and can be found
here, along with some other info about the circuit.
From the link in the desctiption, it says "The “GND” point should be isolated from the chassis but Vee can be connected to chassis."
ReplyDeleteCan someone explain it to me? I thought Vee and ground are the same in DC.
That schematic was drawn a little strangely. GND in the schem is VR (yellow in the layout), and Vee is Ground (green). Wire it the way you normally would a pedal with VR (tube screamer, rat, etc). Hope that helps.
DeleteIt did. I realized that a few moments before reading your reply, thank you for confirming it for me. I got the board all etched up. I still have to source components though. Hope to finish it this week.
DeleteHi. I built this and it works reaaally nice. You can mark it 'verified' unless there's other requirements to that. I really don't know. xD
ReplyDeleteThat's enough for me. Thanks for verifying!
Deletehello.. i'm a newbie here.. is there a schem for ground lift and speaker through for this d.i. box?
ReplyDeleteGround lift wasn't included in the original schem, but I think all you'd have to do is add an on/off (SPST) switch between ground and the X pin of the XLR out. For speaker through I think all you have to do is add a 1/4" jack and wire it to the input.
Deletethanks for your reply.. really appreciate it..
Deletei made this box and i don't know how to use it.. sorry for me..
ReplyDeletehttps://www.google.com/search?espv=2&biw=1401&bih=885&q=What+is+a+Direct+Box%3F
Deletethe input is where the speaker out or the line out of the amp inserted?
DeleteYes.
Deletetnx buddy..
Deletei can make a diy pedal but don't know how to use this thing.. sorry..
ReplyDeletedo you have a passive DI friend ?
ReplyDeleteAny chance you draw a layout for a ABC box like the Morley ABC Selector? http://www.morleypedals.com/abc09es.pdf
ReplyDeleteThanks!
Don't really need a board for one of those. Just wire it point to point like this:
Deletehttp://i38.tinypic.com/4zzqxu.jpg
Great! I'll try this. Thanks.
DeleteAt GND wire 370R 1/2W resistor in parallel 1UF/ 630V non polarized, add a switch for LIFT/ Ground. I do that to kill ground loop, I will try in VEE to see what happens.
ReplyDeleteis it working with phantom power from mixing console ? how to put some led indicator there ?
ReplyDeleteThis isn't designed for use with phantom power. You'll need to connect it to a 9v supply. If you're wiring it with an on/off switch follow the typical off board wiring.
DeleteBut it Will work whith a phantom power micer right?
DeleteNot that I'm aware of. It's designed to be used with a regular 9v power supply
DeleteHello i'm a newbie for this and i want connect this layout to my pc soundcard and my wiring is guitar - pedal - Split L and R - two Direct Box (your layout)for R and L - Stereo Line in my pc soundcard so this is right or wrong ? or i must need balance to unbalance converter ??..
ReplyDeleteI would split the signal after the direct box using either a XLR to stereo cable. The balanced out pads on the layout is for the XLR output jack, and unbalanced out pad is for 1/4" output jack.
ReplyDeleteThank you so much
Deletei made this layout but i dont know how to wiring it.... can i use the balanced output with an stereo jack instead of the xrl???? i want to use it with the pc soundcard so i need an output jack....
ReplyDeleteMy 10R resistor has burned when I turned it on. Any idea on what could have happened??
ReplyDeleteSounds like polarity may have been reversed on your power supply.
DeleteMy resistor is burning up with a center negative and a center postive supply. Anything else that can cause the 10R resistor to fail tried 2 so far..
Deletehas anyone found a solution to this. Just plugged it in and have burned through 2 10R resistors. I want to get this to work.... I'm going to take a look over the build to make sure that it is correct.
DeleteSo after some debugging and checking component placing I noticed that I had placed the IC in upside down. I feel foolish, but I'd rather tell people and have them not make the same mistake.
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ReplyDeleteHello, is it compatible with bass?
ReplyDeleteFriend: is wrongly verified, R9 and R10 are GND, correct to VEE and works correctly. Thank you for your work!
ReplyDeletePolarity with DPDT on-on switch between -out and +out, is correct?
ReplyDeleteThe negative of unbalanced output is connected to GND or to yellow line?
ReplyDeleteGND
DeleteThanks, i will try it
Deletei think 10k resistor (out+ and out-) that connected to 47 ohm and yellow line, is supposed to connect to green line (not yellow line)
DeleteYou may need to up the wattage of that resistor
DeleteQuestion: are 1/2W resistors really required, or can I use 1/4W resistors?
ReplyDeleteHi!
ReplyDeleteIs this DI suitable for bass guitar? I want to add it to the Deadastronaut Bassman Preamp in order to build a proper preamp.
Yes it should work just fine for bass
DeleteHow can I send you a request (w/ schematics) for a pcb besides via social media (i have no social profile of any kind)? I can't find any email in this blog :(
Deletecan we use this with microphones or electronic keyboards?
ReplyDeletecould you post the schematic please? thax
ReplyDeleteBasically i have a request for a proper bass DI, here it is:
Deletehttps://elektrotanya.com/samson_lh_1000_bass_amp_sch.pdf/download.html
The part of the circuit of the request is in the upper left corner, from D6 to C5, it's the DI from the LH500 /LH1000 bass amplifier from Hartke, the "guitar direct box" it's very good on guitar but it's not good for the bass guitar since the signal I get out of it is very distorted even with the gain pot set to minimum.
The only way to get a clean sound is by lowering the volume on the bass guitar itself, but at this point it's almost useless using this DI (yes, i could put a volume pot before the IN of the signal of the DI but I think it's an ugly workaround)
Schematic is linked in the description.
Delete
ReplyDeleteso I'm told the direct box has a transformer, does this box box work like some industrialized ones?
Passive DIs use a transformer, but this is an active one. Meaning it needs a power supply. No transformer necessary with this design.
Deleteshould the xlr pin "1" be connected to the source GND?
ReplyDeletePutted a B10k pot cause I cant find a C one ... tho, how should it be wired ? What actually 1/2 means ? Pin 1 or 2, or BOTH pins into the same hole? Trying to make it give less output (used a 082 instead of 072) thx for the utility !
ReplyDelete1/2 means both lugs 1 and 2 of the pot. Just run one wire from the board to the pot and then put a jumper across both lugs.
Deleteworks both ways but yeah just runned one wire and putted a jumper... Is it possible to add a pot on the input to control input signal without having to turn down on instrument ? I noticed that when Pots of instruments are below half works like a charm but i usually use my instruments around 80% of volumen and the signal outcoming the DI is gained as hell (tried with a B10K , A500K - this was worst -, and stayed at B5K for gain pot ) Thx for reply !
DeleteYeah just but an A100k, 250k or 500k pot before the input. Wire it like a volume pot and it should do the trick (input to lug 3, output from lug 2, lug 1 to ground).
Deleteindeed it do the trick, but could it make some noise ? or am I just snowballing mistakes like cold soldature and stuff? Imma do this from scratch again ... really wishing to keep this as clean as possible. Salutes!
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ReplyDeleteHi, I'm a rookie, but I would like to know what the spdt switch they are talking about is and if I can put it together like any guitar pedal, either a booster once but I need a direct box and this design would help me a lot. How can I make the connections.
ReplyDeleteWorks But i get a Lot of distortion :( almost like an Overdrive pedal plus the pot dosent seem to work, any help with this? Im using a tl072, a 4558D has less distortion But after 10 15 seconds a terrible hums Pops in, oh and using a B pot instead of C
ReplyDeleteExcellent! With an OP2134, this thing is dead-silent at the mixing board.
ReplyDeleteNewbie here. What is the -Out and +Out?
ReplyDeleteThose go to the XLR plug, which has a ground lug, a positive lug, and a negative lug. The pads you reference go to those last two lugs.
DeleteSorry for bumping up this old post, but I want to add a DI out to the multicab sim
ReplyDeletehow should wire to it, just from the output of the MCS in serie (MCS+DI) or parallel (being the output of the MCS also the unbalanced out of the DI) or how?
Thanks in advanced!
I'd just do it in series, MCS into the DI.
DeleteHi effects layouts. Is the output of this at line level or mic level. The gain factors seem to suggest line level. I've added a -20DB U pad on the output which gets me where I want. Also is r9 and r10 meant to go to Gnd? The circuit works with them at vee but I get 4.5v on the xlr outputs. Thanks
ReplyDeleteWill not work with XLR out. There are mistakes in layout.
ReplyDeleteHi! I've built it and when I tested it I got a nasty fizz on top of the clean sound. Sounded to my ears as a kind of layer of added and unwanted distortion, no matter how much I turned down my guitar volume knob or the DI volume knob. Any thoughts on troubleshooting? Thanks.
ReplyDelete