Navigation

Search


Categories

On this page


Archive

Blogroll

RSS 2.0 | Atom 1.0 | CDF

Send mail to the author(s) E-mail

Total Posts: 88
This Year: 0
This Month: 0
This Week: 0
Comments: 9

SC-1 Mic Preamp NOW ON SALE!!!!

After many months of development, testing, troubleshooting, frustration, problems, and accomplishments... the SC-1 mic preamp kit, PSU-1848 power supply kit and power transformer kits are now available for sale!

Click here to ORDER

Photo of a finished SC-1 mic preamp kit!  (Note: XLR jacks and wires shown on picture not included in the kit.)

Features:
- Low-Noise, transformerless, High-Quality Mic Preamp
- All solid-state design, using chipsets from THAT Corp and Burr-Brown
- Soft-start, slow ramp-on +48V phantom power
- Crystal clear Red LED indicator for phantom power
- Electronically balanced input and output stages
- 12-position Grayhill gain selector switch
- Gain range from +6 to +72dB, in 6dB increments
- Input RFI protection
- Input clamping protection
- Output surge protection circuit
- Output RFI protection
... read more...

Download PDF file of Assembly Guide/Kit Instructions

Related products like the PSU-1848 Power Supply Kit, Power Transformer Kit, Power Control Kit are also available for sale. Click here.

 Monday, December 25, 2006
Tuesday, December 26, 2006 12:25:01 AM (Central Standard Time, UTC-06:00) (  |  |  )



This is a schematic plan for building a passive, transformer-based DI Box (Direct Box) from Jensen-Transformers.com. View the original PDF here.

You plug your hi-Z (or high impedance) guitar to jack J1. From here, it goes to a pad on/off switch. You also have 2 pad choices... -10dB and -20dB depending on the position of switch S2.

S3 is a hi-cut filter switch. If S1a (i.e. the pad switch) is switched ON, and the hi-cut filter is ON, the high frequencies are shunted to ground via C3.

The signal going back to your guitar amp via jack J2 is unaffected by the pad and hi-cut switches.

Transformer T1 is a JT-DB-E transformer. This takes care of matching impedance between your guitar and the mic preamp of your mixer. It also converts the guitar signal from unbalanced to balanced connection.  The red-brwn wires of the transformer goes to pin 2 and 3 of the XLR which forms the HOT (+) and COLD (-) connections.

Ground is connected to Pin 1 of the XLR. A ground lift switch is provided, S5, which isolates the pin 1 ground of the mixer from the rest of the circuit.



If you don't want to build one, here are some passive DI boxes.


ART ZDirect Passive DI ART ZDirect Passive DI
View more products from ART

The Zdirect is a high-quality, totally passive interface that lets you connect instrument-, line-, or speaker-level signals to a mixer or other balanced input through a high-performance audio isolation transformer. The high impedance single-ended 1/4 in. input is converted by the transformer into an isolated balanced low impedance signal source. Read Reviews...

List Price: $30
Click for Sale price   Shipping cost: $4.99

Radial JDI Duplex Stereo Passive DI Box Radial JDI Duplex Stereo Passive DI Box
View more products from Radial

A stereo version of the Radial JDI. Ideal for recording, broadcast, and live sound where extreme dynamics such as those produced by digital sampling devices and keyboards are encountered. Completely passive, the JD4 employs two Jensen JT-DBE transformers for 100% isolation and low phase distortion. Read Reviews...

List Price: $350
Click for Sale price   FREE SHIPPING!

Radial JDI MK3 Passive Direct Box Radial JDI MK3 Passive Direct Box
View more products from Radial

The Radial JDI is considered by many to be the world’s finest direct box. It is a passive DI that employs a Jensen isolation transformer for optimum audio performance offering outstanding linearity at all frequencies, combined with extraordinary level handling without introducing distortion. Read Reviews...

List Price: $200
Click for Sale price   FREE SHIPPING!

Radial Pro DI Passive Direct Box Radial Pro DI Passive Direct Box
View more products from Radial

The Radial ProDIs are high-quality, full-range passive direct boxes equipped with custom-made audio transformers for exceptional signal handling without saturation and with extremely low phase distortion in the critical bass and mid regions. The result is exceptional clarity and definition at an attractive price point. Read Reviews...

List Price: $100
Click for Sale price   Shipping cost: $4.99

Comments | Trackback | # 
Related posts:
TS-2 Mic Preamp Production
TS-2 Mic Preamp Testing
TS-2 Mic Preamp Battery Powered
Hakko 808 Desoldering Gun
TS-2 Mic Preamp Prototype
New PSU-4448mk2 Power Supply Kit for Yamaha PM1000 modules (adjustable output voltages)
Tracked by:
"What's inside a passive direct box? " (DIY-Central.com - Go Create something! -... [Trackback]
"Life" (Life diy-centralcom) [Trackback]
"Consumer Electronics Reviews" (Consumer Electronics Reviews) [Trackback]
"Shared Hosting Resources" (Shared Hosting Resources) [Trackback]

Referred by:
http://www.google.com/ig?hl=en [Referral]
Passive Direct Box diy (www.google.com) [Referral]
passive di box design (www.google.com.au) [Referral]
build a passive microphone mixer (www.google.com.my) [Referral]
diy transformer direct box (www.google.com) [Referral]
direct box diy (www.google.com.br) [Referral]
diy passive di for bass (www.google.com.au) [Referral]
sc-1 mic pre reviews (www.google.com) [Referral]
how to design something using a box (www.google.com.my) [Referral]
make your own mic transformer (www.google.nl) [Referral]
build low high z transformer (www.google.com) [Referral]
direct box diy (www.google.com) [Referral]
how to make a passive direct box (www.google.com) [Referral]
microphone switch passive diy (www.google.com) [Referral]
jensen transformer di (www.google.com) [Referral]
create Passive Direct Box (www.google.es) [Referral]
DIY PASSIVE PREAMP (www.google.co.uk) [Referral]
diy passiv speaker switch (www.google.dk) [Referral]
diy passive low cut (www.google.fi) [Referral]
Passive Mixer PCB DESIGN (www.google.co.in) [Referral]
how to build your transformer line mixer (www.google.co.th) [Referral]
passive mic preamp (www.google.ca) [Referral]
how to build an audio direct box (www.google.com) [Referral]
radial jdi review (www.google.com) [Referral]
jensen guitar transformer (www.google.com) [Referral]
passive mixer PCB DEISGN (www.google.co.in) [Referral]
Design and Build your Own Live-sound speakers download (www.google.co.id) [Referral]
passive di box reviews (www.google.com) [Referral]
line mixer pcb kit (www.google.co.uk) [Referral]
DIY line mixer kit (www.google.com) [Referral]
Audio MIXER PCB (www.google.bg) [Referral]
DIY guitar direct box (www.google.co.th) [Referral]
diy speaker switch box (www.google.com) [Referral]
DIY direct injection box (www.google.es) [Referral]
audio transformer plans (www.google.com) [Referral]
how to make di box (www.google.com) [Referral]
worlds best diy studio di design (www.google.com) [Referral]
how to make a DI box (www.google.ca) [Referral]
build your own di box (www.google.com) [Referral]
Design and Build Your Own Live-Sound Speakers (www.google.com.mx) [Referral]
using transformers in electronics (www.google.co.uk) [Referral]
jensen diy preamp (www.google.co.uk) [Referral]
stereo diy passive mixer (www.google.com) [Referral]
diy+direct+box+passive (www.google.com.br) [Referral]
i want to build a passive di box (www.google.co.uk) [Referral]
diy mic transformer (www.google.it) [Referral]
transformer passive preamp diy (www.google.com.au) [Referral]
UTC mic transformers (www.google.com.ar) [Referral]
http://searchservice.myspace.com/index.cfm?fuseaction=sitese... [Referral]
microphone transformer diy (www.google.gr) [Referral]
troubleshooting power direct box (www.google.com) [Referral]
diy microphone on off switch (www.google.ca) [Referral]
diy mic transformer (www.google.com) [Referral]
build a DI box (www.google.com) [Referral]
di box build your own (www.google.com) [Referral]
create own Direct box (www.google.co.id) [Referral]
passive speaker power pcb (www.google.com) [Referral]
electronics build box power (www.google.se) [Referral]
make a direct box (www.google.com) [Referral]
Create your own custom made Transformer (www.google.fr) [Referral]
diy "passive preamp" (www.google.com) [Referral]
Making a DI Box (www.google.com) [Referral]
building a DI Box (www.google.com) [Referral]
build direct box transformer (www.google.com) [Referral]
building a passive direct box (www.google.ca) [Referral]
build your own passive direct box (www.google.com) [Referral]
bass cut off switch diy (www.google.co.ve) [Referral]
http://translate.google.com.br/translate?hl=pt-BR&sl=en&u=ht... [Referral]
diy direct box (www.google.com.br) [Referral]
jensen transformer kits (www.google.com) [Referral]
make your own direct box (www.google.com) [Referral]
build di box (www.google.com) [Referral]
Passive DI Box (www.google.com) [Referral]
bass di "phantom power" transformer protection (www.google.ca) [Referral]
di box diy (www.google.com.ar) [Referral]
diy mic transformer (www.google.it) [Referral]
electronics direct box schematics (www.google.com) [Referral]
diy direct box (www.google.com) [Referral]
how to build audio isolation transformer (www.google.com.hk) [Referral]
building a di box diy (www.google.de) [Referral]
diy mic mixer (www.google.com.sg) [Referral]
DIY low impedance mic preamp (www.google.com) [Referral]
mic preamp kit low impedance (www.google.com) [Referral]
jensen diy reamp (www.google.com) [Referral]
passive bass cut filter (www.google.ch) [Referral]
jensen transformer bass di (www.google.com) [Referral]
how to make a direct box (www.google.ca) [Referral]
passive direct injection box DIY (www.google.com) [Referral]
build a di box (www.google.com) [Referral]
build microphone transformer (www.google.co.za) [Referral]
diy direct box jensen transformer (www.google.com) [Referral]
audio mixer pcb (www.google.co.uk) [Referral]
diy passive direct box schematics (www.google.com) [Referral]
building your own di box (www.google.com) [Referral]
build your own direct box (www.google.com) [Referral]
direct box kit (www.google.com) [Referral]
DIY direct injection box (www.google.com) [Referral]
pdf Design and Build Your Own Live-Sound Speakers (www.google.com.mx) [Referral]
mic mixer pcb (www.google.com.br) [Referral]
electronics audio diy isolation box (www.google.com) [Referral]
creat TransFormers.com (www.google.com) [Referral]
diy how to build your own signal switching guitar box (www.google.com) [Referral]
guitar preamp circuit using Jensen transformer (www.google.com) [Referral]
make your own transformer (www.google.com) [Referral]
make your own passive mixer (www.google.com) [Referral]
diy speaker switch box (www.google.com) [Referral]
passive transformer preamp (www.google.es) [Referral]
how to build a di-box (www.google.com) [Referral]
speaker with own transformer in ZA (www.google.com) [Referral]
diy guitar box speaker (www.google.co.id) [Referral]
DIY direct injection box (www.google.co.uk) [Referral]
how to make an audio transformer (www.google.com) [Referral]
build microphone impedance transformer (www.google.com) [Referral]
dibox diy (www.google.pl) [Referral]
Build Direct Box (www.google.com) [Referral]
microphone transformer schematic (www.google.com) [Referral]
how to build a switch diy (www.google.it) [Referral]
passive di box diy (www.google.pt) [Referral]
how to make a DI box (www.google.ca) [Referral]
diy guitar dibox (www.google.fr) [Referral]
how to build a Passive Di box (www.google.ca) [Referral]
make a direct box (www.google.com) [Referral]
line to instrument level diy reamp (www.google.com.br) [Referral]
diy electronic speaker switch (www.google.com.hk) [Referral]
direct box design (www.google.com) [Referral]
make an on/off electronic speaker circuit board (www.google.co.uk) [Referral]
DIY bass DI (www.google.com) [Referral]
DIY bass DI (www.google.co.uk) [Referral]
how to build recording mixer diy (www.google.com) [Referral]
make your own transformer (www.google.com) [Referral]
make di box (www.google.co.uk) [Referral]
di-box diy (www.google.pt) [Referral]
diy bass DI box (www.google.com) [Referral]
how to build a passive direct in box (www.google.com) [Referral]
diy simple line mixer guitar (www.google.com) [Referral]
how to make box transformers (www.google.com) [Referral]
transformer di box for sale (www.google.com) [Referral]
free projects using transformers (www.google.co.in) [Referral]
jensen DI schematic (www.google.be) [Referral]
build your own direct box (www.google.com) [Referral]
diy direct box (www.google.it) [Referral]
http://images.google.co.id/imgres?imgurl=http://homestudiogu... [Referral]
"DIRECT BOX" TRANSFORMER (www.google.com) [Referral]
passive preamp DIY impedance (www.google.ca) [Referral]
build transformer kit (www.google.com) [Referral]
how to make a box transformer (www.google.com) [Referral]
diy jensen di (www.google.com) [Referral]
Passive direct box DIY (www.google.co.za) [Referral]
passive microphone mixer circuit (www.google.com) [Referral]
diy instrument preamp kit (www.google.com) [Referral]
create your transformers (www.google.com) [Referral]
DIY jensen DI (www.google.fr) [Referral]
how to make box transformers (www.google.com) [Referral]
diy guitar box (www.google.de) [Referral]
+diy +"transformer preamp" (www.google.com.br) [Referral]
saturation switch diy (www.google.com.br) [Referral]
direct box plans (www.google.com) [Referral]
D.I. Box DIY passive (www.google.es) [Referral]
line selector mixer DIY (www.google.fr) [Referral]
jensen direct box diy (www.google.com) [Referral]
diy direct box (www.google.com) [Referral]
speaker diy central (www.google.cl) [Referral]
http://search.mywebsearch.com/mywebsearch/AJmain.jhtml?searc... [Referral]
DIY "direct box`` (www.google.ca) [Referral]
build a D I Box (www.google.co.uk) [Referral]
switching +DIY +guitar (www.google.com) [Referral]
http://www.feedage.com/feeds/702761/diy-centralcom--go-creat... [Referral]
diy isolation box speaker (www.google.fi) [Referral]
di box schematic (www.google.com) [Referral]
how to make a box transformer (www.google.com) [Referral]
passive DI circuit (www.google.com) [Referral]
DIY Isolation Transformer (www.google.co.in) [Referral]
how to make a box transformer (www.google.com) [Referral]
speaker switcher diy (www.google.cl) [Referral]
how to build audio box (www.google.com) [Referral]
build DI box (www.google.com) [Referral]
passive DI schematic circuit (www.google.com.sg) [Referral]
build guitar speaker switcher box (www.google.com) [Referral]
transformers create your own sound (www.google.co.uk) [Referral]
passive mixer instrument level diy (www.google.com) [Referral]
Passive DI Schematic (www.google.com) [Referral]
diy Passive filter (www.google.no) [Referral]
http://images.google.cz/imgres?imgurl=http://media.zzounds.c... [Referral]
design of jensen transformers (www.google.it) [Referral]
direct box build kits (www.google.com) [Referral]
how to make a box transformer (www.google.com) [Referral]
custom made audio mixer kit (www.google.com) [Referral]
passive preamp schematic (www.google.gr) [Referral]
transformer direct box (www.google.com.au) [Referral]
diy passive di box (www.google.ca) [Referral]
diy low to hi-z transformer circuit (www.google.com) [Referral]
direct injection box schematic pcb (www.google.co.id) [Referral]
diy instrument preamp transformer (www.google.fi) [Referral]
how to make a passive speaker (www.google.com) [Referral]
how to make a box transformer (www.google.com) [Referral]
how to make a passive speaker (www.google.co.uk) [Referral]
"bass d.i." build (www.google.com) [Referral]
"DIY speaker" plans photo (www.google.com.ar) [Referral]
build your own bass guitar kit instructions (www.google.com) [Referral]
build di box (www.google.co.uk) [Referral]
d.i.y. Bass direct Box (www.google.co.th) [Referral]
building own power transformer (www.google.co.ke) [Referral]
passive microphone mixer (www.google.com) [Referral]
diy guitar signal mixer (www.google.com) [Referral]
review radial JDI Direct box (verden.abcsok.no) [Referral]
make a box transformer (www.google.com) [Referral]
DIY passive mixer (www.google.co.nz) [Referral]
DIY direct injection box (www.google.com.ph) [Referral]
build own reamp box (www.google.com) [Referral]
jensen diy di box (www.google.se) [Referral]
Make a DI Box (www.ask.com) [Referral]
jensen di transformer (www.google.com) [Referral]
how to built diy passive preamp (www.google.com.tr) [Referral]
build direct boxes (www.google.com) [Referral]
diy di box projects (www.google.com) [Referral]
http://translate.google.hr/translate?hl=hr&sl=en&u=http://ww... [Referral]
diy line mixer (www.google.com) [Referral]
where to buy jensen transformers in uk (www.google.com) [Referral]
diy 12" guitar speaker box (www.google.com) [Referral]
diy mic splitter circuit (www.google.com) [Referral]
make your own transformers the transformers (www.google.com) [Referral]
build box transformer (www.google.com) [Referral]
transformer jensen how make (www.google.com.br) [Referral]
build a di box (www.google.com) [Referral]
passive mixer for sale (www.google.com) [Referral]
direct box transformer (www.google.co.uk) [Referral]
how to make a box transformer (www.google.com) [Referral]
how to make a box transformer (www.google.ca) [Referral]
DIY switchbox guitar (www.google.ca) [Referral]
"Design and build your own live sound speakers" (www.google.dk) [Referral]
build a direct box (www.google.com) [Referral]
DIY HI FI passive preamp kits (www.google.ca) [Referral]
switch diy electronics (www.google.com) [Referral]
diy passive switch audio (www.google.com) [Referral]
diy isolation transformers (www.google.com) [Referral]
guitar switch box schematics (www.google.co.uk) [Referral]
line selector diy (www.google.it) [Referral]
jensen audio mixer schematic (www.google.com) [Referral]
direct box build (www.google.com) [Referral]
build your own di box (www.google.com) [Referral]
Guitar Audio Switcher DIY (www.google.com) [Referral]
passive diy preamps (www.google.gr) [Referral]
direct box kit (www.google.com) [Referral]
build audio isolation transformer (www.google.com) [Referral]
how to make a direct box (www.google.com) [Referral]
how to make a box transformer (www.google.com) [Referral]
diy passive direct box (www.google.com) [Referral]
http://www.google.com/imgres?imgurl=http://homestudioguide.c... [Referral]
jensen tramsformers shematics (www.google.com.au) [Referral]
diy impedance transformer (www.google.com) [Referral]
circuit passive microphone mixer (www.google.com) [Referral]
DIY speaker selector PCB (www.google.hr) [Referral]
how to make a transformer box for audio (www.google.com) [Referral]
diy line mixer (www.google.com) [Referral]
how to make a box transformer (www.google.ca) [Referral]
how to make box transformer (www.google.ca) [Referral]
how to make a box transformer (www.google.ca) [Referral]
how to make box transformer (www.google.com) [Referral]
build your own DI direct injection (www.google.com.au) [Referral]
DIY passive DI transformer (www.google.com) [Referral]
box transformer how-to (www.google.com) [Referral]
mic switch box schematic -patent (www.google.com) [Referral]
how to make a transformers (www.google.com.ph) [Referral]
diy passive audio switch box (www.google.com) [Referral]
make a box transformer (www.google.com) [Referral]
diy line mixer pcb (www.google.com) [Referral]
passive mixer pcb (www.google.co.kr) [Referral]
building a direct box (www.google.com) [Referral]
Passive DI schematic (www.google.ca) [Referral]
sumthing mixer passive (www.google.com) [Referral]
passive direct box building (www.google.hu) [Referral]
build guitar microphone mixer (www.google.dk) [Referral]
how to build a di-box (www.google.dk) [Referral]
reamp box schematic (www.google.com) [Referral]
"Design and Build Your Own Live - Sound Speakers" (www.google.se) [Referral]
Custom made transformers za (www.google.co.za) [Referral]
how to build a passive guitar preamp (www.google.com) [Referral]
diy passive mixer (www.google.com) [Referral]
bass cut circuit passive guitar (www.google.com) [Referral]
DI BOX SCHEMATICS (www.google.com) [Referral]
Download Design and Build Your Own Live - Sound Speakers (www.google.co.uk) [Referral]
high quality d.i. box kit (www.google.nl) [Referral]
electronics build a mixer (www.google.com) [Referral]
how I build direct box (www.google.cl) [Referral]
http://aolsearch.aol.com/aol/search?encquery=6e7d55ab4390904... [Referral]
Stereo Guitar Mixer diy (www.google.com) [Referral]
DIY Build Recording interface 1/4 jacks (www.google.com) [Referral]
building a Direct box jenson (www.google.com) [Referral]
speaker switch box schematic (www.google.com) [Referral]
DIY Line Isolation Transformer (www.google.co.nz) [Referral]
passive di design jensen (www.google.com) [Referral]
DIY Passive Line Mixer (www.google.com) [Referral]
diy projects direct injection box (www.google.com) [Referral]
passive mixer diy (www.google.com) [Referral]
diy passive preamplifier (www.google.de) [Referral]
Passive DI Box Kit (www.google.com) [Referral]
passive direct box schematic (www.google.com) [Referral]
diy direct box (www.google.ca) [Referral]
Passive Microphone On / off switch (www.google.com) [Referral]
diy line mixer (www.google.com) [Referral]
DIY passive DI (www.google.co.nz) [Referral]
diy line mixer (www.google.co.za) [Referral]
how to build DI-BOX (www.google.lv) [Referral]
guitar mic mixer passive diy (www.google.com) [Referral]
how to build your own direct box (www.google.com.mx) [Referral]
direct box transformer (www.google.com) [Referral]
how to build di box (www.google.com) [Referral]
diy mic splitter (www.google.ru) [Referral]
diy di injection box (www.google.es) [Referral]
jensen transformer (www.google.fr) [Referral]
guitar switch box schematic (www.google.com) [Referral]
di box schematics (www.google.ie) [Referral]
high quality passive audio switch box (www.google.com) [Referral]
jensen di schematic (www.google.com) [Referral]
free diy stereo mixer electronics project (www.google.com.ph) [Referral]
diy passive direct box schematics (www.google.com) [Referral]
diy jensen direct (www.google.com) [Referral]
(direct inject) box diy (www.google.com) [Referral]
+"passive transformer preamp" (www.google.com) [Referral]
passive DI circuit (www.google.com) [Referral]
di-box diy (www.google.com.br) [Referral]
live sound speaker diy plans (www.google.com) [Referral]
passive preamp schematic (www.google.com) [Referral]
Design and Build Your Own Live-Sound Speakers (www.google.co.uk) [Referral]
reamp box diy (www.google.nl) [Referral]
Direct Box Kit (www.google.com) [Referral]
direct box kit (www.google.com) [Referral]
passive DI circuit (www.google.com) [Referral]
Jensen DIY (www.google.com.tw) [Referral]
"direct injection" diy transformer (www.google.com) [Referral]
pcb di box (www.google.co.id) [Referral]
mic mixer pcb layout (www.google.com.ar) [Referral]
build direct input box (www.google.ca) [Referral]
preampli passif DIY (www.google.fr) [Referral]
design and build your own live-sound speakers (www.google.com) [Referral]
diy guitar mixer (www.google.dk) [Referral]
diy passive di box schematic (www.google.com) [Referral]
http://searchservice.myspace.com/index.cfm?fuseaction=sitese... [Referral]
own custom isolation box (www.google.com) [Referral]
passive transformer DI Direct Injection (www.google.com) [Referral]
Passive Mic Mixer circuit (www.google.co.uk) [Referral]
guitar transformer (www.google.com) [Referral]
build your own di box (www.google.co.uk) [Referral]
jensen diy (www.google.com) [Referral]
schematic passive microphone mixer (www.google.fi) [Referral]