ADA Depot Too - A Forum To Support Users of ADA Amplification Gear

Please login or register.

Login with username, password and session length
Advanced search  

News:

Board added for "ADA Cab Sims" in Other ADA Gear (coz El asked for it LOL)

Pages: [1]   Go Down

Author Topic: Converting line level to inst level  (Read 2914 times)

0 Members and 1 Guest are viewing this topic.

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4974
Converting line level to inst level
« on: Time Format »

This has become a bit of topic of it's own so started this thread for it.
After chatting with my audiofile mate, (and MJMP please correct me if I'm wrong coz you'll know this stuff much much better than me  :thumb-up: ).
To change line level into inst level, you use a voltage divider where one resistor (1/4 w should be plenty, allegedly metal film are the go) in series and one resistor to ground, the values for the resistors are (I'm told) dependent on the impedance of the line out and inst in and also how much you want to attenuate (IIRC MJMP said in another post in/out impedance should not matter in this case) , e.g. (my take on it) if the line out is 600ohms and the inst in is more than 10kohms... no impedance issues..
So at the inst end of the cable, you wire the one resistor from the cables +ve to the jack +ve (tip), and the other resistor from the cables +ve to ground (sleeve/shield).
This then becomes a fixed voltage divider; which is what I have in the end of the 2 leads I used to use to take the headphone out of my Rockman XL100 into 2 Marshalls.

You could also use a pot (which is a variable voltage divider) of the right value, cable +ve to pot in, pot out to tip, pot ground to ground/sleeve, then you can adjust how much signal attenuation as desired.  I haven't looked it up yet but there should be stuff on the net (probably wiki) how to calculate the resistor or pot values required.
« Last Edit: Time Format by rnolan »
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

GuitarBuilder

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 278
Re: Converting line level to inst level
« Reply #1 on: Time Format »

Sounds very complicated.  Just use one of these and your troubles are over:

Logged
ADA and Rockman Heads
Marshall amps
Strats and Les Pauls

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4974
Re: Converting line level to inst level
« Reply #2 on: Time Format »

I don't know, 4 resistors and a bit of solder  :dunno:   The ebtechs look good, IIRC though someone posted that they suck your tone a bit ??
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4974
Re: Converting line level to inst level
« Reply #3 on: Time Format »

Here's how to do it if you wanted to try this method (http://en.wikipedia.org/wiki/Voltage_divider)
   Figure 1: Voltage divider   In electronics or EET, a voltage divider (also known as a potential divider) is a linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). Voltage
« Last Edit: Time Format by rnolan »
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

El Chiguete

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 671
Re: Converting line level to inst level
« Reply #4 on: Time Format »

Dude you should make a little box for that and sell it... hell I would buy it!
Logged
Before you see the light, you must die!!!

'87 Kramer Stagemaster Custom
'81 Kramer Pacer Standard
custom made Les Paul
ADA MP1
Rane MPE 28
Lexicon MPX-G2
Epiphone Valve Jr. moded!!!

AFFA
Support Your Local 81
Pages: [1]   Go Up